Cobalt 2006-2008, G5 2007

2.0L L4 VIN P Auto 5

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Trouble Code: P1574



Stoplamp Switch Circuit

Possible Causes:

In order to avoid a misdiagnosis, perform the following:



Inspect for proper operation of the stop lamps. Refer to Exterior Lighting Systems Description and Operation in Lighting Systems.
 
Inspect for proper adjustment of the stop lamps. Refer to Stop Lamp Switch Adjustment in Lighting Systems.
 
For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
 

Trouble Code: P1574



Stop Lamp Switch Circuit

Possible Causes:

In order to avoid a misdiagnosis, perform the following:



Inspect for proper operation of the stop lamps. Refer to Exterior Lighting Systems Description and Operation .
 
Inspect for proper adjustment of the stop lamps. Refer to Stop Lamp Switch Adjustment .
 
For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P1600



Control Module Long Term Memory Performance

Trouble Code: P1621



Control Module Long Term Memory Performance

Trouble Code: P1627



Control Module Long Term Memory Performance

Trouble Code: P1629



Theft Deterrent Fuel Enable Signal Not Received

Possible Causes:



DTC P1629 is an indicator that the fuel enable signal was not received within the required 2 second window. This does not necessarily indicate a fault is present with the TDM or ECM. Factors such as a long engine crank, a delay in the serial data communication, or B-codes set in the TDM will cause DTC P1629 to set. This DTC should not be used as a fault indicator, but rather as a symptom to assist in the diagnosis of these other systems.
 

Trouble Code: P1629



Theft Deterrent Fuel Enable Signal Not Received

Possible Causes:



DTC P1629 is an indicator that the challenge/response was not received within the required time. This does not necessarily indicate a fault is present with the TDM or ECM. Factors such as a long engine crank, a delay in the serial data communication, or B-codes set in the TDM will cause DTC P1629 to set. This DTC should not be used as a fault indicator, but rather as a symptom to assist in the diagnosis of these other systems.
 

Trouble Code: P1630



Theft Deterrent Learn Mode Active

Possible Causes:



A GM SPO replacement PCM is in a functional state to learn the password from the theft deterrent module. If the TDM is replaced, the PCM must be placed in password learning mode to relearn the new password. Once learned, the password becomes permanent information that remains in the PCM. The loss of PCM battery or ignition voltage does not affect the programmed password information. Refer to Programming Theft Deterrent System Components .
 

Trouble Code: P1630



Theft Deterrent Learn Mode Active

Trouble Code: P1631



Theft Deterrent Fuel Enable Signal Not Correct

Trouble Code: P1632



Theft Deterrent Fuel Disable Signal Received

Trouble Code: P1632



Theft Deterrent Fuel Disable Signal Received

Possible Causes:



The prerelease password sent to the ECM by the TDM is reliant on the communications between the transponder located in the vehicle key and the TDM. Failure to establish communications or an interruption in the communications between the vehicle key and the TDM will cause the fuel disable message to be sent and the setting of DTC B1632. DTC B3055 or B3060 will be set in the TDM. To properly diagnose DTC P1632, DTC B3055 or B3060 must be diagnosed and corrected first.
 

Trouble Code: P1668



Generator L-Terminal Control Circuit

Trouble Code: P1680



Control Module Accelerator Pedal Position (APP) System Performance

Trouble Code: P1681



Control Module Throttle Position (TP) System Performance

Trouble Code: P1682



Ignition 1 Switch Circuit 2

Trouble Code: P1683



Powertrain Control Module Internal Malfunction

Trouble Code: P1810



Transmission Fluid Pressure (TFP) Position Switch Circuit

Trouble Code: P1811



Maximum Adapt and Long Shift

Possible Causes:



Ask the customer about overloading the vehicle, exceeding the trailer towing limit, or towing in Overdrive.
 

Trouble Code: P1816



Transmission Fluid Pressure (TFP) Valve Position Switch Indicates Park/Neutral (P/N) with Drive Ratio

Trouble Code: P1818



Transmission Fluid Pressure (TFP) Valve Position Switch Indicates Drive without Drive Ratio

Trouble Code: P1818



Transmission Fluid Pressure (TFP) Valve Position Switch Indicates Drive without Drive Ratio

Possible Causes:

The following conditions may also be present if any of these DTCs set:



Disables auto door lock function
 
Disables Cruise Control
 
Disables the shift interlock
 

Trouble Code: P2101



Throttle Actuator Position Performance

Possible Causes:



The throttle valve is spring loaded to a slightly open position. This is referred to as the rest position.
 
The throttle valve should not be completely closed nor should they be open any more than the specified amount.
 
The throttle valve should move open and to the closed position without binding under the normal spring pressure.
 
The throttle should NOT be free to move open or closed WITHOUT spring pressure. Replace the throttle body if any of these conditions are found.
 
Important: Operating the throttle blade with the Throttle Blade Control function of the scan tool may cause additional DTCs to set. Do not attempt to diagnose DTCs set during this function.
 
The scan tool has the ability to operate the throttle control system using Special Functions. Actuate the throttle valve using the throttle blade control function located in the TAC System menu. This function will operate the throttle valve through the entire range in order to determine if the throttle body and system operate correctly.
 
Inspect for the following conditions:

Use the J 35616 Connector Test Adapter Kit for any test that requires probing the PCM harness connector or a component harness connector.
 
Poor connections at the PCM or at the component--Inspect the harness connectors for a poor terminal to wire connection. Refer to Testing for Intermittent Conditions and Poor Connections for the proper procedure.
 

If the condition is intermittent, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P2119



Throttle Closed Position Performance

Possible Causes:



Inspect for mechanical conditions or binding that may be temperature related.
 
Components may not move freely in extreme heat or cold due to the presence of contaminants or ice formation.
 

Trouble Code: P2120



Accelerator Pedal Position (APP) Sensor 1 Circuit

Trouble Code: P2122



Accelerator Pedal Position (APP) Sensor 1 Circuit Low Voltage

Trouble Code: P2123



Accelerator Pedal Position (APP) Sensor 1 Circuit High Voltage

Trouble Code: P2125



Accelerator Pedal Position (APP) Sensor 2 Circuit

Trouble Code: P2127



Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage

Trouble Code: P2128



Accelerator Pedal Position (APP) Sensor 2 Circuit High Voltage

Trouble Code: P2135



Throttle Position (TP) Sensor 1-2 Correlation

Possible Causes:



If the DTC is determined to be intermittent, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P2138



Accelerator Pedal Position (APP) Sensor 1-2 Correlation

Possible Causes:



The PCM compares the signal of each of the accelerator pedal position sensor to each other throughout the entire range of operation. Clear the DTCs and actuate the pedal through the entire range with the ignition ON and the engine OFF.
 
Use the J 35616 Connector Test Adapter Kit for any test that requires probing the PCM harness connector or a component harness connector. Using this kit will prevent damage to the harness connector terminals.
 
Refer to Intermittent Conditions for intermittent conditions.
 

Trouble Code: P2176



Minimum Throttle Position Not Learned

Possible Causes:



The throttle valve is spring loaded to a slightly open position.
 
The throttle valve should be open approximately 20 percent. This is referred to as the rest position.
 
The throttle valve should not be completely closed nor should they be open any more than the specified amount.
 
The throttle valve should move open and to the closed position without binding under the normal spring pressure.
 
The throttle should NOT be free to move open or closed WITHOUT spring pressure. Replace the throttle body if any of these conditions are found.
 
Important: Operating the throttle blade with the Throttle Blade Control function of the scan tool may cause additional DTCs to set. Do not attempt to diagnose DTCs set during this function.
 
The scan tool has the ability to operate the throttle control system using Special Functions. Actuate the throttle valve using the throttle blade control function located in the TAC System menu. This function will operate the throttle valve through the entire range in order to determine if the throttle body and system operate correctly.
 
Inspect for the following conditions:

Use the J 35616 Connector Test Adapter Kit for any test that requires probing the PCM harness connector or a component harness connector.
 
Poor connections at the PCM or at the component--Inspect the harness connectors for a poor terminal to wire connection. Refer to Testing for Intermittent Conditions and Poor Connections for the proper procedure.
 
If the condition is intermittent, refer to Testing for Intermittent Conditions and Poor Connections .
 

 

Trouble Code: P2227



Barometric Pressure (BARO) Sensor Performance

Trouble Code: P2228



Barometric Pressure (BARO) Sensor Circuit Low Voltage

Trouble Code: P2229



Barometric Pressure (BARO) Sensor Circuit High Voltage

Trouble Code: P2261



Supercharger Bypass Valve Stuck

Trouble Code: P2534



Ignition 1 Switch Circuit Low Voltage

Trouble Code: P2535



Ignition 1 Switch Circuit High Voltage

Trouble Code: P2610



Powertrain Control Module Internal Malfunction

 
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