Envoy, Rainer, Trailblazer 2006-2007

6.0L V8 VIN H Auto 5

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Trouble Code: P0788



3-2 Shift Solenoid (SS) Control Circuit High Voltage

Trouble Code: P0851



Park/Neutral Position (PNP) Switch Circuit Low Voltage

Trouble Code: P0852



Park/Neutral Position (PNP) Switch Circuit High Voltage

Trouble Code: P0856



EBCM Torque Signal Circuit Invalid Request

Possible Causes:

Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to the following:



Testing for Electrical Intermittents
 
Testing for Intermittent Conditions and Poor Connections
 
Wiring Repairs
 
Connector Repairs
 

Trouble Code: P0894



Transmission Component Slipping

Possible Causes:



Bronze material found in the transmission oil pan may indicate stator shaft bushing wear. If bushing wear is suspected, inspect the stator shaft and the input, turbine, shaft for damage.
 
Refer to Symptoms - Automatic Transmission for more information.
 

Trouble Code: P0961



Line Pressure Control (PC) Solenoid System Performance

Possible Causes:



DTC P0961 may set under low voltage conditions caused by high electrical system demands.
 

Trouble Code: P0973



1-2 Shift Solenoid (SS) Control Circuit Low Voltage

Trouble Code: P0974



1-2 Shift Solenoid (SS) Control Circuit High Voltage

Trouble Code: P0976



2-3 Shift Solenoid (SS) Control Circuit Low Voltage

Trouble Code: P0977



2-3 Shift Solenoid (SS) 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 increase or decrease the MAF sensor signal that is interpreted by the ECM. 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 .
 

Trouble Code: P1133



HO2S Insufficient Switching Bank 1 Sensor 1

Trouble Code: P1153



HO2S Insufficient Switching Bank 2 Sensor 1

Trouble Code: P1258



Engine Coolant Overtemperature - Protection Mode Active

Trouble Code: P1380



Misfire Detected - Rough Road Data Not Available

Trouble Code: P1381



Misfire Detected - No Communication with Brake Control Module

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: P1482



Cooling Fan Speed Output Circuit

Trouble Code: P1516



Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

Trouble Code: P1574



Stop Lamp Switch Circuit

Possible Causes:



Refer to Exterior Lighting Systems Description and Operation in order to avoid a misdiagnosis.
 
For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P1621



Transmission Control Module (TCM) 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.



Inspect 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 class 2 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 inspected for intermittent operation due to a loss of power or ground to the module itself. After repairing the cause of DTC 1626, clear all DTCs from the systems capable of storing this DTC and DTC U1192.
 
The VTD Passlock parameters can be monitored in the PCM under engine data 2, display with a scan tool.
 
The scan tool Diagnostic Circuit Check can be used to:

Monitor the class 2 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 Class 2 Message Monitor will show the status of each module on the class 2 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 for the complete class 2 data link to determine if there are any unlisted modules.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 .If a repair is necessary, refer to Wiring Repairs or Connector Repairs .
 

Trouble Code: P1630



Theft Deterrent Learn Mode Active

Possible Causes:



The PCM in learn mode is a DTC for the vehicle at the assembly plant, dealership, and outside garage personnel as an indication that the learn mode is enabled. This means the PCM is now ready to learn a new password.
 

Trouble Code: P1631



Theft Deterrent Fuel 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 10 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.Inspect 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 .If a repair is necessary, refer to Wiring Repairs or Connector Repairs .
 

Trouble Code: P1632



Theft Deterrent Fuel Disable Signal Received

Possible Causes:

Attempting to start the vehicle by bypassing the Passlock- system or by substituting parts without performing the Programming Theft Deterrent System Components procedure may set a DTC P1631 and a P1632. If no password is received, a DTC U1064 and P1632 may be set. An intermittent may be caused by a poor connection, a rubbed through wire insulation, or by a wire broken inside the insulation. Thoroughly inspect any suspected circuitry for the following items:



Backed-out terminals or improper mating
 
Broken locks
 
Improperly formed or damaged terminals
 
Poor terminal to wiring connections
 
Physical damage to the wiring harness
 
Corrosion
 

Trouble Code: P1668



Generator L-Terminal Control Circuit

Trouble Code: P1682



Ignition 1 Switch Circuit 2

Possible Causes:



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

Trouble Code: P1689



EBCM Invalid Torque Signal

Possible Causes:

Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to the following:



Testing for Electrical Intermittents
 
Testing for Intermittent Conditions and Poor Connections
 
Wiring Repairs
 
Connector Repairs
 

Trouble Code: P1810



Transmission Fluid Pressure (TFP) Position Switch Circuit

Possible Causes:



Refer to the Transmission Fluid Pressure Manual Valve Position Switch Logic for the normal range signals and the invalid combinations. On the table, LOW is 0 volts, HI is ignition voltage.
 
Sediment in the valve body may cause improper operation of the TFP manual valve position switch. If sediment intrusion is suspected, clean the valve body and replace the TFP manual valve position switch.
 

Trouble Code: P1815



Transmission Fluid Pressure (TFP) Valve Position Switch - Start in Wrong Range

Possible Causes:



Refer to the Transmission Fluid Pressure Manual Valve Position Switch Logic for the normal range signals and the invalid combinations. On the table, LOW is 0 volts, HI is ignition voltage.
 
Sediment in the valve body may cause improper operation of the TFP manual valve position switch. If sediment intrusion is suspected, clean the valve body and replace the TFP manual valve position switch.
 

Trouble Code: P1816



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

Possible Causes:



Refer to the Transmission Fluid Pressure Manual Valve Position Switch Logic for the normal range signals and the invalid combinations. On the table, LOW is 0 volts, HI is ignition voltage.
 
Sediment in the valve body may cause improper operation of the TFP manual valve position switch. If sediment intrusion is suspected, clean the valve body and replace the TFP manual valve position switch.
 

Trouble Code: P1818



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

Possible Causes:



Refer to the Transmission Fluid Pressure Manual Valve Position Switch Logic for the normal range signals and the invalid combinations. On the table, LOW is 0 volts, HI is ignition voltage.
 
Sediment in the valve body may cause improper operation of the TFP manual valve position switch. If sediment intrusion is suspected, clean the valve body and replace the TFP manual valve position switch.
 

Trouble Code: P2101



Throttle Actuator Position Performance

Trouble Code: P2119



Throttle Closed Position Performance

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

 
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