Equinox 2005-2007, Torrent 2006-07

3.4L V6 VIN F Auto 8

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Trouble Code: P0979



Shift Solenoid (SS) 3 Control Circuit Low Voltage

Trouble Code: P0980



Shift Solenoid (SS) 3 Control Circuit High Voltage

Trouble Code: P0982



Shift Solenoid (SS) 4 Control Circuit Low Voltage

Trouble Code: P0983



Shift Solenoid (SS) 4 Control Circuit High Voltage

Trouble Code: P0985



Shift Solenoid (SS) 5 Control Circuit Low Voltage

Trouble Code: P0986



Shift Solenoid (SS) 5 Control Circuit High Voltage

Trouble Code: P1101



Intake Air Flow System Performance

Possible Causes:



A steady or intermittent high resistance of 15 ohms or greater on the ignition 1 voltage circuit will cause the MAF sensor signal to be increased by as much as 60 g/s. To pinpoint this condition perform a voltage drop test on the circuit.
 
Any type of contamination on the MAF sensor heating elements will degrade the proper operation of the sensor. Certain types of contaminants act as a heat insulator, which will impair the response of the sensor to airflow changes. Water or snow can create the opposite effect, and cause the signal to increase rapidly.
 
Depending on the current ambient temperature, and the vehicle operating conditions, a MAF sensor signal circuit that is shorted to the IAT signal circuit will cause the MAF sensor signal to be skewed or erratic. Additionally it may cause a rapid fluctuation in the IAT Sensor parameter.
 
A skewed or stuck engine coolant temperature (ECT) or IAT sensor will cause the calculated models to be inaccurate and may cause this DTC to run when it should not. Refer to Temperature Versus Resistance .
 
The barometric pressure (BARO) that is used by the ECM to calculate the air flow models is initially based on the MAP sensor at ignition ON. When the engine is running, the ECM will continually update the BARO value near wide open throttle (WOT) using the MAP sensor and a calculation. A skewed MAP sensor will cause the BARO value to be inaccurate.
 

Trouble Code: P1106



Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage

Possible Causes:



This DTC may set due to poor idle characteristics. A possible cause may be uncontrolled fueling due to an open or high resistance in the HO2S 1 low signal circuit. Before replacing any component, ensure that this condition does not exist.
 

Trouble Code: P1106



Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage

Trouble Code: P1107



Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage

Trouble Code: P1111



Intake Air Temperature (AIT) Sensor Circuit Intermittent High Voltage

Trouble Code: P1111



Intake Air Temperature (IAT) Sensor Circuit Intermittent High Voltage

Possible Causes:



When the vehicle is at ambient temperature, the IAT sensor and the ECT sensor should be relatively close to each other. Refer to Temperature Versus Resistance .
 

Trouble Code: P1112



Intake Air Temperature (AIT) Sensor Circuit Intermittent High Voltage

Trouble Code: P1112



Intake Air Temperature (IAT) Sensor Circuit Intermittent High Voltage

Possible Causes:



When the vehicle is at ambient temperature, the IAT sensor and the ECT sensor should be relatively close to each other. Refer to Temperature Versus Resistance .
 

Trouble Code: P1114



Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage

Trouble Code: P1114



Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage

Possible Causes:



An overheating condition may cause this DTC to set.
 
After starting the engine, the ECT sensor temperature should rise steadily to about 90°C (194°F) then stabilize after the thermostat opens.
 
If a short to a separate voltage source occurs this DTC may set and damage the ECT sensor.
 

Trouble Code: P1115



Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage

Trouble Code: P1115



Engine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage

Possible Causes:



An overheating condition may cause this DTC to set.
 
After starting the engine, the ECT sensor temperature should rise steadily to about 90°C (194°F) then stabilize after the thermostat opens.
 
If a short to a separate voltage source occurs this DTC may set and damage the ECT sensor.
 

Trouble Code: P1125



Accelerator Pedal Position (APP) System

Trouble Code: P1133



HO2S Insufficient Switching Bank 1 Sensor 1

Trouble Code: P1133



HO2S Insufficient Switching Sensor 1

Trouble Code: P1134



HO2S Transition Time Ratio Bank 1 Sensor 1

Trouble Code: P1174



Air Fuel Imbalance Bank 1

Possible Causes:



The fuel trim cylinder balance diagnostic is very sensitive to heated oxygen sensor (HO2S) design. A non-OE sensor or an incorrect part number may set a false DTC.
 
Monitoring the misfire current counters, or misfire graph, may help to isolate the cylinder that is causing the condition.
 

Trouble Code: P1258



Engine Coolant Over Temperature - Fuel Disabled

Trouble Code: P1258



Engine Coolant Overtemperature - Protection Mode Active

Trouble Code: P1336



CKP Sensor System Variation Not Learned

Possible Causes:



Set the parking brake and block the drive wheels for safety.
 
Verify the hood is closed.
 
Read the trouble codes. If a code is set, refer to that code.
 
Start the engine. Allow engine temperature to reach at least 158ºF (70ºC). Then key off.
 
Select Crankshaft Position Variation Learn procedure on Scan Tool & start the vehicle.
 
Apply the brake pedal firmly and verify the selector is in Park.
 
Increase accelerator pedal position until fuel cutoff is reached at the test rpm (e.g., 5150). Quickly release the accelerator pedal after fuel cutoff is reached. The CKP system variation compensating values are learned when the engine speed (rpm) decreases back to idle speed and the procedure terminates.
 
Read the trouble codes and recheck for DTC P1336.
 
If DTC P1336 runs and passes, the CKP system variation "learn" procedure is complete. If not, look for other codes. If no codes are set, repeat the test procedure.
 

Trouble Code: P1400



Cold Start Emission Reduction Control System

Possible Causes:



Any loading of the engine that lowers engine RPM, such as with partial application of the clutch, A/C cycling etc. during the first 120 seconds of engine runtime may set this DTC.
 

Trouble Code: P1400



Cold Start Emission Reduction Control System

Possible Causes:



Any loading of the engine that lowers engine RPM, such as with partial application of the clutch, during the first 120 seconds of engine runtime may set this DTC.
 

Trouble Code: P1404



Exhaust Gas Recirculation (EGR) Closed Position Performance

Possible Causes:



Inspect for excessive deposits on the EGR valve pintle or seat. Remove the EGR valve and check for deposits that may interfere with the EGR valve pintle extending completely or cause the pintle to stick.
 
If the problem is intermittent, refer to Intermittent Conditions .
 

Trouble Code: P1404



Exhaust Gas Recirculation (EGR) Closed Position Performance

Possible Causes:



Inspect for excessive deposits on the EGR valve pintle or seat. Remove the EGR valve and inspect for deposits that may interfere with the EGR valve pintle extending completely or cause the pintle to stick.
 

Trouble Code: P1516



Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

Possible Causes:



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

Trouble Code: P1516



Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

Trouble Code: P1574



Stoplamp Switch Circuit

Possible Causes:

In order to avoid a misdiagnosis, perform the following:



Inspect for proper adjustment of the cruise release switch. Refer to Cruise Release Switch Adjustment .
 
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: P1600



Wrong Security Code Entered

Trouble Code: P1621



Control Module Long Term Memory Performance

Trouble Code: P1626



Theft Deterrent Fuel Enable Signal Lost

Possible Causes:

Important: Do not clear DTCs unless directed by a diagnostic procedure. Clearing DTCs will also clear valuable Freeze Frame and Failure Records data.



Check for published service bulletins relating to exhibited symptoms or component operation.
 
Inspect all related wiring and connections including the PCM and BCM connections. These may cause an intermittent malfunction.
 
If the serial data circuit is shorted to ground or shorted to voltage, then all systems connected to the serial data circuit will not be able to communicate properly. Systems capable of storing loss of communications DTCs, or the DTCs with the letter "U" as a prefix, will have these codes stored in their memory. If a DTC U1192 is stored in the PCM memory along with the P1626, then a fault occurred at some point after the PCM received the correct password. The BCM must also be checked for intermittent operation due to a loss of power or ground to the module itself. After repairing the cause of DTC P1626, clear all DTCs from the systems capable of storing this DTC and DTC U1192.
 
The VTD Passlock- parameters can be monitored in the PCM in the Engine Data 2 display with a scan tool.
 
The scan tool Diagnostic Circuit Check can be used to:

Monitor the serial data circuit for modules which have been or are communicating.
 
Monitor for loss of communications DTCs with the letter "U" as a prefix: U1001-U1199.
 
Clear loss of communication DTCs. When a Clear Codes command is issued, all codes, Freeze Frame and Failure Records information is cleared.
 

The scan tool Message Monitor will show the status of each module on the serial data circuit. A status of Active indicates that the module is communicating with the scan tool. An inactive status indicates that the module previously communicated with the scan tool, but is not communicating currently. The inactive status will only appear if the loss of communication occurs while on the message monitor screen. If a module is not listed at all, then the missing module never successfully established communications with the scan tool or lost communication while on another screen. Refer to Scan Tool Does Not Communicate with Class 2 Device in Computer/Integrating Systems for the complete serial data link to determine if there are any unlisted modules.
 



A poor connection
 
Rubbed through wire insulation
 
A broken wire inside the insulation
 

Trouble Code: P1627



Wrong Security Code Entered

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 new replacement PCM will be in a functional state to learn the password from the BCM. If the BCM is replaced, the PCM must be placed in password learning mode to relearn a new password. Once learned, the password becomes permanent information that remains with the vehicle. The loss of PCM battery or ignition voltage will not affect the programmed password information.
 

Trouble Code: P1631



Theft Deterrent Start Enable Signal Not Correct

Possible Causes:

Important: Do not clear DTCs unless directed by a diagnostic procedure. Clearing DTCs will also clear valuable Freeze Frame and Failure Records data.



If the PCM is replaced, the PCM must re-learn a valid password and crankshaft variation.
 
If the BCM is replaced, the PCM must re-learn a valid password.
 
Check for published service bulletins relating to exhibited symptoms or component operation.
 
If the vehicle does not start, or starts and stalls:

Turn OFF the ignition and wait at least 5 seconds before trying to restart.
 
If a fault or tamper has been detected, the BCM will not forward the correct password to the PCM for a period of ten minutes, even if the condition is corrected during that time period. This may cause a DTC P1631 to set in the PCM. This timer can be monitored in the Passlock- Data parameter of the scan tool. Once the time has elapsed, the BCM will determine if the condition is still present.
 

The PCM and BCM parameters can be monitored with a scan tool.The Passlock- state and the auto learn timer can be viewed in the Passlock- Data parameter of the scan tool.Check the following for preventing the Passlock- sensor from communicating with the BCM:

Passlock sensor
 
Ignition switch assembly
 
Passlock sensor circuitry
 
Bent pins at the small Passlock- sensor
 

If this DTC sets along with a DTC B2960, then the problem was caused by malfunctioning Passlock- components or circuitry, not the PCM.Inspect all related wiring and connections including the PCM and BCM connections. These may cause an intermittent malfunction.An intermittent may be caused by any of the following conditions:

A poor connection
 
Rubbed through wire insulation
 
A broken wire inside the insulation
 

Thoroughly inspect any circuitry that is suspected of causing the intermittent complaint. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
 

 
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