Sierra, Silverado 2006-2007

6.6L V8 VIN 2 Std 4

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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: 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: P1644



Traction Control Delivered Torque Output Circuit

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:

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: P2066



Fuel Level Sensor 2 Performance

Possible Causes:



Use the Freeze Frame and/or Failure Records data in order to locate an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data may aid in determining the number of miles since the DTC set. The Fail Counter and Pass Counter can also aid in determining the number of ignition cycles that the diagnostic reported a pass and/or fail. Operate the vehicle within the same Freeze Frame conditions, including those for RPM, for engine load, for vehicle speed, for temperature, and for others. This will isolate when the DTC failed. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
 

Trouble Code: P2067



Fuel Level Sensor 2 Circuit Low Voltage

Possible Causes:



Use the Freeze Frame and/or Failure Records data in order to locate an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data may aid in determining the number of miles since the DTC set. The Fail Counter and Pass Counter can also aid in determining the number of ignition cycles that the diagnostic reported a pass and/or fail. Operate the vehicle within the same freeze frame conditions, including those for RPM, for engine load, for vehicle speed, for temperature, and for others. This will isolate when the DTC failed. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
 

Trouble Code: P2068



Fuel Level Sensor 2 Circuit High Voltage

Possible Causes:



Use the Freeze Frame and/or Failure Records data in order to locate an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data may aid in determining the number of miles since the DTC set. The Fail Counter and Pass Counter can also aid in determining the number of ignition cycles that the diagnostic reported a pass and/or fail. Operate the vehicle within the same freeze frame conditions, including those for RPM, for engine load, for vehicle speed, for temperature, and for others. This will isolate when the DTC failed. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
 

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: P2127



Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage

Trouble Code: P2128



Accelerator Pedal Position (APP) Sensor 2 Circuit High Voltage

Trouble Code: P2138



Accelerator Pedal Position (APP) Sensor 1-2 Correlation

Trouble Code: P2146



Injector Positive Voltage Control Circuit Group 1

Trouble Code: P2149



Injector Positive Voltage Control Circuit Group 2

Trouble Code: P2152



Injector Positive Voltage Control Circuit Group 3

Trouble Code: P2155



Injector Positive Voltage Control Circuit Group 4

Trouble Code: P2199



Intake Air Temperature (IAT) Sensor 1-2 Correlation

Possible Causes:



1. A slight to moderate resistance in either signal or low reference circuit, can widen the spread between the two IAT sensors, and cause this DTC to set.
 
2. An IAT sensor that is skewed lower at various ambient temperatures, due to more resistance than is normal, can widen the spread between the two sensors and cause this DTC to set. Measure and record the resistance of the IAT sensor 1 and IAT sensor 2 at various ambient temperatures, and then compare those measurements to the Temperature vs. Resistance Table. Refer to Temperature Versus Resistance .
 
3. Inspect IAT sensor 1 and sensor 2 terminals, for corrosion or a poor connection.
 
4. If the ignition has been OFF for more than 10 hours, then determine which IAT sensor is skewed by comparing ECT, IAT sensor 1, and IAT sensor 2 parameters with a scan tool.
 

Trouble Code: P2228



Barometric Pressure (BARO) Sensor Circuit Low Voltage

Trouble Code: P2229



Barometric Pressure (BARO) Sensor Circuit High Voltage

Trouble Code: P2510



Engine Control Module Relay Circuit

Trouble Code: P2544



Transmission Torque Request Circuit

Possible Causes:



This diagnostic trouble code may set due to low system voltage. Ensure that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test . Verify charging system is operating correctly. Refer to Charging System Test . Verify there is no parasitic drain on the battery. Refer to Battery Electrical Drain/Parasitic Load Test .
 

Trouble Code: P2563



Turbocharger Boost Control Position Sensor Performance

Possible Causes:



Verify that any electrical aftermarket devices are properly connected and grounded. Refer to Checking Aftermarket Accessories .
 
A MAP sensor that is skewed or bias may cause this DTC to set.
 
A restricted oil supply feed to the turbocharger may cause this DTC to set. Refer to Turbocharger Lack of Oil Supply .
 

Trouble Code: P2564



Turbocharger Boost Control Position Sensor Circuit Low Voltage

Possible Causes:



Verify that any electrical aftermarket devices are properly connected and grounded. Refer to Checking Aftermarket Accessories .
 

Trouble Code: P2565



Turbocharger Boost Control Position Sensor Circuit High Voltage

Possible Causes:



Verify that any electrical aftermarket devices are properly connected and grounded. Refer to Checking Aftermarket Accessories .
 

Trouble Code: P2610



Control Module Ignition Off Timer Performance

Trouble Code: P2636



Fuel Pump 2 Flow Insufficient

Possible Causes:



When outside temperatures are below 0°C (32°F), the fuel tank pickup screen may ice over from water in the fuel tank.
 
If the engine is running while fueling the vehicle, this DTC may set.
 
The fuel will default to empty when this DTC sets.
 

Trouble Code: P268A



Fuel Injector Calibration Data Not Programmed

Trouble Code: U0001



High Speed CAN Communication Bus

Possible Causes:



This DTC cannot be retrieved with a current status. Diagnosis of current DTC is accomplished via the symptom, Scan Tool Does Not Communicate with GMLAN Device. Refer to Scan Tool Does Not Communicate with High Speed GMLAN Device .
 
An intermittent condition is likely to be caused by a short on the GMLAN serial data circuits. Use the Scan Tool Does Not Communicate with GMLAN Device procedure in order to isolate an intermittent condition. Refer to Scan Tool Does Not Communicate with High Speed GMLAN Device .
 

Trouble Code: U0073



Controller Area Network (CAN) Bus Communication

Possible Causes:



This DTC cannot be retrieved with a current status. Diagnosis of a current DTC is accomplished via the symptom Scan Tool Does Not Communicate with High Speed GMLAN Device .
 
An intermittent condition is likely to be caused by a short on the GMLAN serial data circuits. Use the DMM MIN/MAX function to capture/locate intermittent conditions.
 

Trouble Code: U0100



Lost Communication With Engine Control Module (ECM)

Possible Causes:



A poor connection at the inoperative module may cause this code to set.
 
An improperly powered module may cause this code to set.
 

Trouble Code: U0100



Lost Communication With Engine Control Module (ECM)

Possible Causes:

The following conditions may cause the DTC to set:



A poor connection or terminal tension at a GMLAN module
 
An intermittent open on either high speed GMLAN serial data circuit
 
An open voltage or ground circuit to a module
 
An internal module malfunction
 
A short between the GMLAN serial data circuits
 
A short to voltage or ground on either of the GMLAN serial data circuits
 

Trouble Code: U0101



Lost Communication With Transmission Control Module (TCM)

Possible Causes:



A poor connection at the inoperative module may cause this code to set.
 
An improperly powered module may cause this code to set.
 

Trouble Code: U0106



Lost Communication With Glow Plug Control Module (GPCM)

Possible Causes:



A poor connection at the inoperative module may cause this code to set.
 
An improperly powered module may cause this code to set.
 

Trouble Code: U0111



Lost Communication With Energy Storage Control Module (ESCM)

Possible Causes:

The following conditions may cause the DTC to set:



A poor connection or terminal tension at a GMLAN module
 
An intermittent open on either high speed GMLAN serial data circuit
 
An open voltage or ground circuit to a module
 
An internal module malfunction
 
A short between the GMLAN serial data circuits
 
A short to voltage or ground on either of the GMLAN serial data circuits
 

Trouble Code: U0120



Lost Communication With Starter/Generator Control Module (SGCM)

Possible Causes:

The following conditions may cause the DTC to set:



A poor connection or terminal tension at a GMLAN module
 
An intermittent open on either high speed GMLAN serial data circuit
 
An open voltage or ground circuit to a module
 
An internal module malfunction
 
A short between the GMLAN serial data circuits
 
A short to voltage or ground on either of the GMLAN serial data circuits
 

Trouble Code: U0131



Lost Communication With Electro-Hydraulic Power Steering (EHPS) Module

Possible Causes:

The following conditions may cause the DTC to set:



A poor connection or terminal tension at a GMLAN module
 
An intermittent open on either high speed GMLAN serial data circuit
 
An open voltage or ground circuit to a module
 
An internal module malfunction
 
A short between the GMLAN serial data circuits
 
A short to voltage or ground on either of the GMLAN serial data circuits
 

Trouble Code: U0293



Lost Communication With Hybrid Control Module (HCM)

Possible Causes:

The following conditions may cause the DTC to set:



A poor connection or terminal tension at a GMLAN module
 
An intermittent open on either high speed GMLAN serial data circuit
 
An open voltage or ground circuit to a module
 
An internal module malfunction
 
A short between the GMLAN serial data circuits
 
A short to voltage or ground on either of the GMLAN serial data circuits
 

Trouble Code: U0299



N/A

Possible Causes:



A poor connection at the inoperative module may cause this code to set.
 
An improperly powered module may cause this code to set.
 

Trouble Code: U0299



N/A

Possible Causes:

The following conditions may cause the DTC to set:



A poor connection or terminal tension at a GMLAN module
 
An intermittent open on either high speed GMLAN serial data circuit
 
An open voltage or ground circuit to a module
 
An internal module malfunction
 
A short between the GMLAN serial data circuits
 
A short to voltage or ground on either of the GMLAN serial data circuits
 

 
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