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Old 07-26-2010, 10:27 AM   #1
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Default GM techs p3400 code 2007

P3400 cylinder deactvation what is this..first time i have run into it
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Old 07-26-2010, 10:56 AM   #2
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Default Re: GM techs p3400 code 2007

what type of car? what engine? deactivated due to a miss fire ? running rough?
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Old 07-26-2010, 11:03 AM   #3
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Default Re: GM techs p3400 code 2007

gmc 1500 pick up with a 5.3. and the motor is shaking just alittle like it is skipping but not realy
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Old 07-26-2010, 11:09 AM   #4
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Default Re: GM techs p3400 code 2007

Might sound like a stupid question but how is the engine oil? I have seen instances where low oil level, low pressure can affect this. Last one I ran into was due to lack of maintenance. Guy hadn't changed his oil for 17K.
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Old 07-26-2010, 11:11 AM   #5
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Default Re: GM techs p3400 code 2007

Hyperlinks messed up the info.
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Old 07-26-2010, 11:27 AM   #6
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Default Re: GM techs p3400 code 2007

Service Information




2007 GMC Truck Sierra - 2WD | Sierra, Silverado (VIN C/K) Service Manual | Document ID: 1741272
DTC P3400
Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provide an overview of each diagnostic category.
DTC Descriptor

DTC P3400: Cylinder Deactivation System Performance

Diagnostic Fault Information

Circuit
Short to Ground
Open/High Resistance
Short to Voltage
Signal Performance
Ignition 1 Voltage
P0102, P0443, P3401, P3425, P3441, P3449
P3400, P3401, P3425, P3441, P3449
--
P3400
Cylinder 1 Deactivation Solenoid Control Circuit 1
P0300, P3401
P0300, P3400, P3401
P0300, P3401
P3400
Cylinder 4 Deactivation Solenoid Control Circuit 2
P0300, P3425
P0300, P3400, P3425
P0300, P3425
P3400
Cylinder 6 Deactivation Solenoid Control Circuit 3
P0300, P3441
P0300, P3400, P3441
P0300, P3441
P3400
Cylinder 7 Deactivation Solenoid Control Circuit 4
P0300, P3449
P0300, P3400, P3449
P0300, P3449
P3400
Circuit/System Description

The cylinder deactivation system is used to deactivate 4 cylinders of the engine under light load driving conditions. The engine control module (ECM) commands the cylinder deactivation solenoids ON to deactivate engine cylinders 1, 7, 6, and 4, switching to 4 cylinders or V4 mode. The cylinder deactivation solenoids controls the oil flow to the appropriate valve lifters. The engine operates on 8 cylinders or V8 mode, during engine starting, engine idling, and medium to heavy throttle conditions.
Ignition voltage is supplied directly to the 4 cylinder deactivation solenoids. The engine control module (ECM) controls the 4 cylinder deactivation solenoids by grounding the control circuit with a solid state device called a driver.
The Cylinder Deactivation System Performance diagnostic is a test of the internal mechanical condition of the engine, during operation in V4 mode. The engine control module (ECM) determines the internal mechanical condition of the engine through the actual measured values of the mass airflow (MAF) sensor, the intake manifold absolute pressure (MAP) sensor, and the throttle position sensor. The actual measured values of the 3 sensors are then compared to the calculated values for V4 mode, stored in the ECM. If the measured values are incorrect for V4 mode, the ECM will set DTC P3400, and will return to V8 mode operation.
Conditions for Running the DTC

DTCs P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0119, P0335, and P0336 are not set.
The engine speed is between 450-6,400 RPM.
The IAT Sensor parameter is between -7 and +125C (+19 and +257F).
The ECT Sensor parameter is between 70- 125C (158-257F).
Time in V8 mode is greater than 2 seconds.
Time in V4 mode is greater than 2 seconds.
This DTC runs continuously within the enabling conditions.
Conditions for Setting the DTC

The control module detects that the actual measured values from the MAF sensor, MAP sensor, and TP sensor, is not within the range of the calculated values for V4 mode.
The above condition is met for greater than 100 milliseconds.
Action Taken When the DTC Sets

DTC P3400 is a Type B DTC.
The engine will return to V8 mode.
Conditions for Clearing the DTC

DTC P3400 is a Type B DTC.
Diagnostic Aids

This DTC will not set during engine idling conditions. The vehicle will need to be driven for the DTC to set.
The valve lifter oil manifold solenoids are assigned to the following engine cylinders:
- Solenoid #1 = Cylinder #1
- Solenoid #2 = Cylinder #4
- Solenoid #3 = Cylinder #6
- Solenoid #4 = Cylinder #7
Reference Information

Schematic Reference

Engine Controls Schematics
Connector End View Reference



Description and Operation

Cylinder Deactivation (Active Fuel Management) System Description
Electrical Information Reference



DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference



Special Tools Required

EN-46999 Displacement On Demand Tester
Circuit/System Verification
  1. Note: The engine oil level and the oil pressure are critical to the correct operation of the Cylinder Deactivation System. Verify that the engine has the correct oil level and the correct oil pressure before continuing with this diagnostic. Refer to Oil Pressure Diagnosis and Testing. Inspect the Valve Lifter Oil Filter for a restriction or blockage. Refer to Valve Lifter Oil Filter Replacement.


    <LI type=1>Ignition ON, observe the scan tool DTC information. Verify that DTC P0201-P0208, P0351-P0358, P3401, P3425, P3441, or P3449 is not set.
    ⇒If a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.




    <LI type=1>Engine idling at the normal operating temperature. Verify there is no abnormal engine noise.
    ⇒If there is an abnormal engine noise, refer to Symptoms - Engine Mechanical for further diagnosis.


    <LI type=1>Perform the Cylinder Deactivation (Active Fuel Management) System Compression Test. The Cylinder Deactivation System should pass the compression test.
  2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
  1. <LI type=1>Ignition OFF, remove the valve lifter oil manifold assembly ignition fuse from the underhood fuse block. Note: Probe each terminal at the underhood fuse block with a test lamp connected to ground to determine what terminal to connect the DMM. The test lamp should not illuminate on the circuit that needs to be tested.


    <LI type=1>Connect a DMM between the ignition circuit fuse terminal going to the valve lifter oil manifold assembly and the ECM housing. <LI type=1>Ignition ON, command each Cylinder 1, 4, 6, and 7 Deactivation solenoid ON and OFF with the scan tool. Verify the resistance of each solenoid is between 11-18 Ω with the solenoid commanded ON.
    ⇒If greater than the specified range for all cylinder deactivation solenoids, test the ignition circuit for an open/high resistance.



    ⇒If greater than the specified range for one or more but not all cylinder deactivation solenoids, test both the control circuit and ignition circuit for an open/high resistance or an open/high resistance in the cylinder deactivation solenoid. If the circuits and solenoid test normal replace the ECM.
  2. If all circuits and components test normal, refer to Cylinder Deactivation (Active Fuel Management) Valve Lifter Oil Manifold Diagnosis and Testing for further mechanical diagnosis of valve lifter oil manifold assembly.
Component Testing
Static Test
  1. <LI type=1>Ignition OFF, disconnect the harness connector at the valve lifter oil manifold assembly. <LI type=1>Connect the harness that is labeled resistance from the displacement on demand (DOD) tester to the valve lifter oil manifold connector. <LI type=1>Connect the power leads from the DOD tester to B+ and ground. Test for 11-18 Ω on each valve lifter oil manifold solenoid.
    ⇒If not within the specified range for each solenoid, replace the valve lifter oil manifold assembly.
  2. Test for infinite resistance between each valve lifter oil manifold circuit terminal listed and the valve lifter oil manifold housing.
    ⇒If less than infinite resistance, replace the valve lifter oil manifold assembly.
Dynamic Test
  1. <LI type=1>Ignition OFF, disconnect the harness connector at the valve lifter oil manifold assembly. <LI type=1>Connect the cable that is labeled power from the displacement on demand DOD tester to the connector. <LI type=1>Connect the power leads from the DOD tester to B+ and ground.
  2. Command each valve lifter oil manifold solenoid ON and OFF using the DOD tester. You should be able to hear each solenoid turn ON and OFF.
    ⇒If the function does not perform as specified, replace the valve lifter oil manifold assembly.
Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Valve Lifter Oil Manifold Replacement

Control Module References for ECM replacement, setup, and programming


2010 General Motors. All rights reserved.
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Old 07-26-2010, 11:33 AM   #7
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Default Re: GM techs p3400 code 2007

This is what I could find,alot of people say that the condition of the oil is important.


--------------------------------------------------------------------------------

DTC P3400 Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provide an overview of each diagnostic category.

DTC Descriptor DTC P3400: Cylinder Deactivation System Performance

Circuit/System Description The Cylinder Deactivation System Performance diagnostic is a test of the internal mechanical condition of the engine, during operation in V3 mode. The engine control module (ECM) determines the internal mechanical condition of the engine through the actual measured values of the mass airflow (MAF) sensor, the intake manifold absolute pressure (MAP) sensor, and the throttle position (TP) sensor. The actual measured values of the three sensors are then compared to calculated values for V6 mode, stored in the ECM. If the measured values are incorrect for V3 mode, the ECM will set DTC P3400, and will return to V6 mode operation.

Conditions for Running the DTC

DTCs P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0335, and P0336 are not set.

The engine speed is between 450-6,400 RPM.

The IAT Sensor parameter is between -7 and +125C (+19 and +257F)

The ECT Sensor parameter is between 70 and 125C (158 and 257F).

Time in V6 mode is more than 2 seconds.

Time in V3 mode is more than 2 seconds.

This DTC runs continuously within the enabling conditions.

Conditions for Setting the DTC

The ECM detects that the actual measured values from the MAF sensor, the MAP, and the TP sensor, is not within the range of calculated values, for V6 mode operation.

The above condition is met for more than 100 milliseconds.

Action Taken When the DTC Sets

DTC P3400 is a type B DTC

The engine will return to V6 mode.

Conditions for Clearing the DTC DTC P3400 is a type B DTC.

Diagnostic Aids

This DTC will not set during engine idling conditions.

The vehicle will need to be driven for this DTC to set.

This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .

The valve lifer oil manifold (VLOM) solenoids are assigned to the following engine cylinders:

- Solenoid #1 = Cylinder #1

- Solenoid #2 = Cylinder #3

- Solenoid #3 = Cylinder #5

Reference Information Schematic Reference Engine Controls Schematics

Schematic Reference

Engine Control Module Connector End Views

Engine Controls Connector End Views

Electrical Center Identification Views

Description and Operation Cylinder Deactivation (Active Fuel Management) System Description

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Scan Tool Reference

Scan Tool Data List

Scan Tool Data Definitions

Scan Tool Output Controls

Circuit/System Verification Start and idle the engine. Allow the engine to reach normal engine operating temperature. The engine should idle smoothly, without any misfires. If the engine misfires, refer to DTC P0300 . Monitor the cylinder deactivation system data parameters with a scan tool. Road test the vehicle under light throttle and load conditions that will allow the ECM to command V3 mode. If all enabling conditions are met for cylinder deactivation, and if no internal engine hydraulic/mechanical fault conditions are present, the ECM will continue with V3 mode operation. ⇒ If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.

Circuit/System Testing Important: Perform the Circuit/System Verification first.

Electrical System Testing If DTCs P3401, P3417, or P3433 are set, then refer to DTC P3401, P3417, or P3433 . Ignition ON, engine OFF, command each valve lifter oil manifold (VLOM) solenoid ON, and OFF, using the scan tool output control function. While standing next to the engine compartment, you should be able to hear the solenoids energize, and de-energize with each command. ⇒ If you cannot here each solenoid energize and de-energize, then refer to Cylinder Deactivation (Active Fuel Management) System Diagnosis .

Mechanical System Testing Refer to Cylinder Deactivation (Active Fuel Management) System Diagnosis .

Cylinder Deactivation (Active Fuel Management) System Diagnosis Important: Proper oil viscosity is critical to Cylinder Deactivation (AFM) Operation. ALWAYS verify proper engine oil viscosity and oil change interval BEFORE beginning AFM system diagnosis. Improper viscosity or excessively dirty engine oil may cause improper operation. Under NO circumstances should engine oil additives be used, unless recommended by General Motors. If you suspect the engine oil is dirty, contaminated, or of improper viscosity, change engine oil and filter prior to performing any Cylinder Deactivation diagnostics. If it is found that one or more of the Active Fuel Management (AFM) lifters are not operating properly and needs replacing, replace all 6 AFM lifters and the lifter guide as an assembly.

Check the engine oil level. Fill as required. Using the scan tool, check for diagnostic codes within the powertrain control module (PCM). Refer to Diagnostic System Check - Vehicle . Repair as required. Verify proper engine oil pressure. Refer to Engine Mechanical Specifications . Verify proper operation of the Cylinder Deactivation (AFM) system components. Refer to Cylinder Deactivation (Active Fuel Management) Valve Lifter Oil Manifold Diagnosis and Testing . Replace all Cylinder Deactivation (AFM) valve lifters as an assembly. Refer to Valve Lifter Replacement .

2007 Chevrolet Impala | Impala, Monte Carlo (VIN W) Service Manual | Document ID: 1797043

--------------------------------------------------------------------------------

Cylinder Deactivation (Active Fuel Management) Valve Lifter Oil Manifold Diagnosis and Testing Important: If it is found that one or more of the active fuel management (AFM) lifters are not operating properly and needs replacing, replace all 6 AFM lifters and the lifter guide as an assembly.

Tools Required

EN-46999 Active Fuel Management Tester

EN-46999-6 Active Fuel Management Air Test Adapter

EN-46999-10 Active Fuel Management Test Harness

J 39200 Digital Multimeter

J 39570 Chassis Ear

Important:

A minimum shop air source of 206 kPa (30 psi) is required for manifold testing.

A water bleed is located on the side of the EN-46999 . Occasionally, depress the valve in order to remove excess water from the tool.

The Cylinder Deactivation (AFM) Valve Lifter Oil Manifold Diagnosis and Testing procedure consists of two basic tests.

The Fuel Injector Wiring Harness Power and Resistance Test.

The Lifter Oil Manifold Assembly (LOMA) Air Bench Test.

The Fuel Injector Wiring Harness Power and Resistance Test will test for the following conditions:

Proper operation of the LOMA circuits within the fuel injector wiring harness.

Stuck open LOMA solenoids due to an open or short circuit in the LOMA circuits within the fuel injector wiring harness.

Stuck closed LOMA solenoids due to an open or short circuit in the LOMA circuits within the fuel injector wiring harness.

The LOMA air bench test provides a maximum 206 kPa (30 psi) of filtered shop air to the manifold and will test each solenoid/valve for the following conditions:

Proper operation.

A stuck open condition - constant air flow.

A stuck closed condition - no air flow.

Fuel Injector Wiring Harness Power and Resistance Test

In this test you will individually depress buttons 1 through 3 on the EN-46999 in order to activate each of the solenoid/valves. When activating each solenoid/valve, a clicking noise should be heard from each of the solenoid valves in the LOMA. If a clicking noise is not heard when activating each solenoid/valve, use the J 39200 to measure and record a resistance reading which will be used in the diagnosis.

Button one will energize the solenoid/valve one for engine cylinder number one.

Button two will energize the solenoid/valve two for engine cylinder number three.

Button three will energize three the solenoid/valve three for engine cylinder number five.

Important: In order to accurately diagnose the AFM system, it is necessary to use the J 39570 to detect the audible clicks when cycling the valves in the LOMA. Failure to do so may result in the misdiagnosis of a properly functioning system.

Connect the 12 volt power supply connectors (7) of the EN-46999 to a 12 volt power supply. Verify the power light ( on the tool is illuminated.

If the light on the tool intermittently goes out when connected to a 12 volt power supply, verify that your connections are good.

If the light on the tool is not illuminated when connected to a 12 volt power supply, test and/or replace the 3 amp fuse.

Disconnect the 16-way fuel injector harness from the engine harness, and connect the power lead on the EN-46999-10 cable to the fuel injector harness connector. Depress button number 1 on the tool to activate solenoid/valve for cylinder number 1. You should hear a clicking sound from the solenoid/valve, indicating that the solenoid/valve is working properly. Depress button number 2 on the tool to activate solenoid/valve for cylinder number 3. You should hear a clicking sound from the solenoid/valve, indicating that the solenoid/valve is working properly. Depress button number 3 on the tool to activate solenoid/valve for cylinder number 5. You should hear a clicking sound from the solenoid/valve, indicating that the solenoid/valve is working properly. If after testing, it has been determined that one or more of the solenoid/valves is not functioning properly, continue to step number 9. If after testing, it has been determined that the solenoid/valves are functioning properly, reevaluate the vehicle for active fuel management (AFM) functional or DTC concerns before proceeding. Refer to Cylinder Deactivation (Active Fuel Management) System Diagnosis for the 3.9L engine.

Connect the resistance lead on the EN-46999-10 cable to the 16-way fuel injector harness connector. Connect the leads on the J 39200 to the EN-46999 . With the J 39200 connected, depress buttons 1, 2, and 3 on the EN-46999 . Record the resistance reading for each solenoid/valve. Remove the upper intake manifold to gain access to the LOMA connector. Refer to Upper Intake Manifold Replacement . Important: The power lead on the EN-46999-10 is a one way connector. Ensure proper alignment prior to installing the connector into the LOMA to avoid damaging the connector or the LOMA.

Connect the power lead on the EN-46999-10 to the LOMA connector.

Depress button number 1 on the tool to activate solenoid/valve for cylinder number 1 (3). You should hear a loud clicking sound from the solenoid/valve, indicating that the solenoid/valve is working properly. Depress button number 2 on the tool to activate solenoid/valve for cylinder number 3 (2). You should hear a loud clicking sound from the solenoid/valve, indicating that the solenoid/valve is working properly. Depress button number 3 on the tool to activate solenoid/valve for cylinder number 5 (1). You should hear a clicking sound from the solenoid/valve, indicating that the solenoid/valve is working properly. If all solenoids/valves are found to be operating properly, proceed to step number 19. If one of more of the solenoid/valves are not working properly, replace the LOMA. Refer to Valve Lifter Oil Manifold Replacement .

Important: The resistance lead on the EN-46999-10 is a one way connector. Ensure proper alignment prior to installing the connector into the LOMA to avoid damaging the connector or the LOMA.

Connect the resistance lead on the EN-46999-10 cable to the LOMA connector, making sure to establish a solid connection. With the J 39200 still connected, depress buttons 1, 2, and 3 on the EN-46999 . Record the resistance reading for each solenoid/valve. Compare the two resistance values taken in steps number 11 and 20 with the resistance values contained in the AFM LOMA specifications chart. Refer to Engine Electrical Specifications.

If the resistance values recorded for the LOMA are greater or less than the allowable limits, replace the LOMA. Refer to Valve Lifter Oil Manifold Replacement .

If the resistance values recorded for the LOMA while connected inline with the fuel injection wiring harness are greater or less than the allowable limits, replace fuel injection wiring harness. Refer to Fuel Injector Wiring Harness Replacement.

If all the resistance values recorded are within specifications, proceed to the LOMA Air Bench Test.

LOMA Air Bench Test In this test you will individually depress buttons 1 through 3 on the EN-46999 in order to activate each of the solenoid/valves. When activating each solenoid/valve, a loud click should be heard from the solenoid and an increased amount of air will exit the outlet ports.

Button one will energize the solenoid/valve one for engine cylinder number one.

Button two will energize the solenoid/valve two for engine cylinder number three.

Button three will energize the solenoid/valve three for engine cylinder number five.

Remove the LOMA from the vehicle. Refer to Valve Lifter Oil Manifold Replacement . Install the EN-46999-6 (1) to the manifold, ensuring that the original oil manifold gasket and filter are in place, and that the air passage holes on the EN-46999-6 are lined up properly with the air passages in the gasket as well as the LOMA. Failure to do so will result in incorrect test results. Notice: Refer to Fastener Notice in the Preface section.

Install two of the manifold bolts (2) to the EN-46999-6 . Tighten Tighten the bolts to 25 Nm (18 lb ft).

Connect the air out hose (2) of the EN-46999 (5) to the EN-46999-6 (1). Verify the air supply switch (4) is in the OFF position. Connect the air in hose (6) of the EN-46999 to a shop air source. Ensure that the 12 volt power supply connectors (7) of the EN-46999 are properly connected to a 12 volt power supply. Verify the power light ( on the tool is illuminated.

If the light on the tool intermittently goes out when connected to a 12 volt power supply, verify that your connections are good.

If the light on the tool is not illuminated when connected to a 12 volt power supply, test and/or replace the 3 amp fuse.

Important: The power lead on the EN-46999-10 is a one way connector. Ensure proper alignment prior to installing the connector into the LOMA to avoid damaging the connector or the LOMA.

Connect the power lead of the EN-46999-10 cable (3) to the LOMA, making sure to establish a good connection. Important: Some air leakage around EN-46999-6 (1) during testing is normal.

Turn the air supply switch (4) on the EN-46999 to ON.

Depress button number 1 on the tool to activate solenoid/valve number 1. The solenoid/valve for cylinder number 1 should open, allowing air to exit the outlet ports (1) of the manifold. Depress button number 2 on the tool to activate solenoid/valve 2. The solenoid/valve for cylinder number 3 should open, allowing air to exit the outlet ports (2) of the manifold. Depress button number 3 on the tool to activate solenoid/valve 3. The solenoid/valve for cylinder number 5 should open, allowing air to exit the outlet ports (3) of the manifold. When the test is completed, turn the air source switch on the EN-46999 to the OFF position and disconnect the tool from the 12 volt power supply, shop air source, and the LOMA. Remove the EN-46999 from the LOMA. If after testing, it has been determined that one or more of the solenoid/valves is not functioning properly, replace the LOMA as an assembly. Refer to Valve Lifter Oil Manifold Replacement . If after testing, it has been determined that the solenoid/valves are functioning properly, replace all the valve lifters as an assembly. Refer to Valve Lifter Replacement .


Please only use this feature to report severe guidelines violations.






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Old 07-26-2010, 11:57 AM   #8
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Default Re: GM techs p3400 code 2007

Thanks
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