Envoy, Rainer, Trailblazer 2006-2007

4.2L L6 VIN S Auto 7

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Trouble Code: P1380



Misfire Detected Rough Road Data Not Available

Trouble Code: P1381



Misfire Detected-No Communication With Brake Control Module

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, during the first 70 seconds of engine run time 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 partial application of the clutch, A/C cycling, etc. during the first 120 seconds of the engine run time may set this DTC.
 

Trouble Code: P1482



Cooling Fan Speed Output Circuit

Trouble Code: P150A



Transmission Output Speed Signal Circuit

Possible Causes:



A defective transmission output speed sensor (OSS) can cause inaccurate speed reading, creating faulty replicated output speed signal. Also, inspect the OSS for cracks, loose mounting, or damage.
 
If the speed sensor passes testing, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P150B



Transmission Output Speed Sensor Circuit Intermittent

Possible Causes:



A defective transmission output speed sensor (OSS) can cause inaccurate speed reading, creating faulty replicated output speed signal. Also, inspect the OSS for cracks, loose mounting, or damage.
 
If the speed sensor passes testing, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P1516



Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

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 Throttle Actuator Control (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. Check 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.
 
For intermittents, refer to Intermittent Conditions .
 

Trouble Code: P1545



Air Conditioning (A/C) Clutch Relay Control Circuit

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: P1574



Stop Lamp Switch Circuit

Possible Causes:



Ensure the stop lamps operate properly. Refer to Exterior Lighting Systems Description and Operation in order to avoid misdiagnosis.
 

Trouble Code: P1600



Control Module Performance

Trouble Code: P1600



Control Module Programming

Trouble Code: P1621



Control Module Long Term Memory Performance

Trouble Code: P1621



Control Module Programming

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 in Computer/Integrating Systems 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 in Wiring Systems.If a repair is necessary, refer to Wiring Repairs or Connector Repairs in Wiring Systems.
 

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: P1627



Control Module Performance

Trouble Code: P1627



Control Module Programming

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: P1630



Theft Deterrent Learn Mode Active

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 in Wiring Systems.If a repair is necessary, refer to Wiring Repairs or Connector Repairs in Wiring Systems.
 

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: P1631



Theft Deterrent Fuel Enable Signal Not Correct

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: P1681



Control Module Long Term Memory Performance

Trouble Code: P1682



Ignition 1 Switch Circuit 2

Trouble Code: P1683



Control Module Ignition OFF Timer Performance

Trouble Code: P1689



Traction Control Delivered Torque Output Circuit

Possible Causes:



It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
 
If an intermittent malfunction exists, refer to Checking Aftermarket Accessories .
 
Possible causes for DTC C0244 to set:

An open in the torque delivered control circuit
 
Torque Delivered Control circuit shorted to ground or voltage
 
A communication frequency problem
 
A communication duty cycle problem
 
Torque delivered control circuit has a wiring problem, terminal corrosion, or poor connections
 
EBCM not receiving information from the PCM
 

 

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: P1689



Traction Control Delivered Torque Output Circuit

Possible Causes:



Check for poor or intermittent connections of the EBCM and the PCM. Refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P1762



Transmission Mode Switch Signal Circuit

Trouble Code: P1810



Transmission Fluid Pressure (TFP) Position Switch Circuit

Possible Causes:



Refer to the Transmission Fluid Pressure (TFP) Manual Valve Position Switch Logic table for the normal range signals and the invalid combinations. On the table, LOW is 0 volts, HI is ignition voltage.
 
Inspect the connectors at the PCM, the TFP manual valve position switch and all other circuit connecting points for an intermittent condition. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
 
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: P1810



Transmission Fluid Pressure (TFP) Position Switch Circuit

Possible Causes:



Refer to the table 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.
 
Inspect the connectors at the PCM, the TFP manual valve position switch and all other circuit connecting points for an intermittent condition. Refer to Testing for Intermittent Conditions and Poor Connections .
 
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

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 Throttle Actuator Control (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. Check 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.
 
For intermittents, refer to Intermittent Conditions .
 

 
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