Sierra, Silverado 2006-2007

8.1L V8 VIN G Auto 5

Print

Trouble Code: P0734



Incorrect 4th Gear Ratio

Possible Causes:



Incorrect ratio codes typically indicate mechanical conditions with specific clutches, such as 1-2-3-4 clutch and 4-5-6 clutch, for 4th range.
 
Incorrect ratio code could indicate a hydraulically failed solenoid. Observe DTC information for specific solenoid.
 
Clutch test mode can be used to measure stall speed. Observe turbine speed signal. If the turbine speed signal does not return to zero or rises during the stall test, a leak or obstruction in a specific clutch apply circuit could be present.
 
You may have to drive the vehicle in order to experience a condition.
 

Trouble Code: P0735



Incorrect 5th Gear Ratio

Possible Causes:



Incorrect ratio codes typically indicate mechanical conditions with specific clutches, such as 4-5-6 clutch and 3-5-Reverse clutch, for 5th range.
 
Incorrect ratio code could indicate a hydraulically failed solenoid. Observe DTC information for specific solenoid.
 
Clutch test mode can be used to measure stall speed. Observe turbine speed signal. If the turbine speed signal does not return to zero or rises during the stall test, a leak or obstruction in a specific clutch apply circuit could be present.
 
You may have to drive the vehicle in order to experience a condition.
 

Trouble Code: P0736



Incorrect Reverse Ratio

Possible Causes:



Incorrect ratio codes typically indicate mechanical conditions with specific clutches, such as 3-5-Reverse clutch and low and reverse clutch for REVERSE range.
 
Incorrect ratio code could indicate a hydraulically failed solenoid. Observe DTC information for specific solenoid.
 
Clutch test mode can be used to measure stall speed. Observe turbine speed signal. If the turbine speed signal does not return to zero or rises during the stall test, a leak or obstruction in a specific clutch apply circuit could be present.
 
You may have to drive the vehicle in order to experience a condition.
 

Trouble Code: P0740



Torque Converter Clutch (TCC) Enable Solenoid Control Circuit

Possible Causes:



With the TCC engaged, the TCC slip speed should be -20 to +50 RPM.
 

Trouble Code: P0741



Torque Converter Clutch (TCC) System - Stuck Off

Possible Causes:



Contamination may cause the TCC apply valve to stick in the valve body.
 
There may be internal damage in the torque converter causing the no TCC apply.
 

Trouble Code: P0742



Torque Converter Clutch (TCC) System - Stuck On

Possible Causes:

The TCC fluid hydraulically applies the TCC, possibly causing an engine stall, under the following conditions:



The TCC is hydraulically stuck ON
 
The parking brake is applied
 
Any gear range is selected
 

Trouble Code: P0748



Pressure Control (PC) Solenoid Control Circuit

Possible Causes:



DTC P0748 may set under low voltage conditions caused by high electrical system demands.
 

Trouble Code: P0751



1-2 Shift Solenoid Valve Performance - No First or Fourth Gear

Possible Causes:



Verify that the transmission meets the specifications in the Shift Speed .
 
Other internal transmission failures may cause more than one shift to occur.
 
Refer to the Shift Solenoid Valve State and Gear Ratio .
 

Trouble Code: P0752



1-2 Shift Solenoid Valve Performance - No Second or Third Gear

Possible Causes:



Verify that the transmission meets the specifications in the Shift Speed .
 
Other internal transmission failures may cause more than one shift to occur.
 
Refer to the Shift Solenoid Valve State and Gear Ratio .
 

Trouble Code: P0753



1-2 Shift Solenoid Control Circuit

Possible Causes:



Refer to the Shift Solenoid Valve State and Gear Ratio .
 

Trouble Code: P0756



2-3 Shift Solenoid Valve Performance - No First or Second Gear

Possible Causes:



Verify that the transmission meets the specifications in the Shift Speed .
 
Other internal transmission failures may cause more than one shift to occur.
 
Refer to the Shift Solenoid Valve State and Gear Ratio .
 

Trouble Code: P0757



2-3 Shift Solenoid Valve Performance - No Third or Fourth Gear

Possible Causes:



Verify that the transmission meets the specifications in the Shift Speed .
 
Other internal transmission failures may cause more than one shift to occur. Refer to the Shift Solenoid Valve State and Gear Ratio .
 

Trouble Code: P0757



2-3 Shift Solenoid Valve Performance - No Third or Fourth Gear

Possible Causes:



Verify that the transmission meets the specifications in the Shift Speed .
 
Other internal transmission failures may cause more than one shift to occur.
 
Refer to the Shift Solenoid Valve State and Gear Ratio .
 

Trouble Code: P0758



2-3 Shift Solenoid Control Circuit

Possible Causes:



Refer to the Shift Solenoid Valve State and Gear Ratio .
 

Trouble Code: P0761



Shift Solenoid (SS) 3 Valve Performance - Stuck Off

Possible Causes:



Inspect the wiring for poor electrical connections at the TCM. Inspect for the following conditions:

A bent terminal
 
A backed-out terminal
 
A damaged terminal
 
Poor terminal tension
 
A chafed wire
 
A broken wire inside the insulation
 

When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.You may have to drive the vehicle in order to experience a condition.This DTC may indicate that SS3 is mechanically defective or the shift valve is stuck in the destroked state.When DTC P0761 and P0873 are set in combination, this may indicate an open circuit condition is present at the pressure switch circuit or the shift valve is stuck in the destroked position.
 

Trouble Code: P0762



Shift Solenoid (SS) 3 Valve Performance - Stuck On

Possible Causes:



Inspect the wiring for poor electrical connections at the TCM. Inspect for the following conditions:

A bent terminal
 
A backed-out terminal
 
A damaged terminal
 
Poor terminal tension
 
A chafed wire
 
A broken wire inside the insulation
 

When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.You may have to drive the vehicle in order to experience a condition.This DTC may indicate that SS3 is mechanically defective or the shift valve is stuck in the stroked state.When DTC P0762 and P0872 are set in combination, this may indicate a short to ground is present at the pressure switch circuit or the shift valve is stuck in the stroked state.
 

Trouble Code: P0776



Pressure Control Solenoid 2 (PCS2) Stuck Off

Possible Causes:



Inspect the wiring for poor electrical connections at the TCM. Inspect for the following conditions:

A bent terminal
 
A backed-out terminal
 
A damaged terminal
 
Poor terminal tension
 
A chafed wire
 
A broken wire inside the insulation
 

When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.You may have to drive the vehicle in order to experience a condition.This DTC indicates the on-coming clutch being controlled by PCS2 is not applied or applied too slowly. This could indicate a leak or obstruction in a specific clutch apply circuit. Observe scan tool failure record data for previous or current range information when the DTC was set, in order to determine the specific shift when the DTC was set. Refer to Solenoid and Clutch Chart to determine which clutch circuit is suspect.Important: Clutch failure due to installation of an engine power upgrade is not covered under the transmission manufacturers warranty. Inspect for the presence of an add-on engine power package. When engine horsepower or torque is increased over factory rating, a shift flare condition may occur.
 

Trouble Code: P0777



Pressure Control Solenoid 2 (PCS2) Stuck On

Possible Causes:



Inspect the wiring for poor electrical connections at the TCM. Inspect for the following conditions:

A bent terminal
 
A backed-out terminal
 
A damaged terminal
 
Poor terminal tension
 
A chafed wire
 
A broken wire inside the insulation
 

When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.You may have to drive the vehicle in order to experience a condition.This DTC indicates the off-going clutch, being controlled by PCS2, is not releasing or is slow to release. This could indicate a leak or obstruction in a specific clutch apply circuit. Observe scan tool failure record data for previous or current range information when the DTC was set, to determine the specific shift when the DTC was set. Refer to the Solenoid and Clutch Chart to determine which clutch circuit is suspect.Important: Clutch failure due to installation of an engine power upgrade is not covered under the transmission manufacturers warranty. Inspect for the presence of an add-on engine power package. When engine horsepower or torque is increased over factory rating, a shift flare condition may occur.
 

Trouble Code: P0785



3-2 Shift Solenoid (SS) Control Circuit

Trouble Code: P0796



Clutch Pressure Control (PC) Solenoid 3 - Stuck Off

Possible Causes:



When attempting to set transmission performance DTCs, observe the Freeze Frame and Failure Records to assist in duplicating the failure conditions.
 

Trouble Code: P0797



Clutch Pressure Control (PC) Solenoid 3 - Stuck On

Possible Causes:



When attempting to set transmission performance DTCs, observe the Freeze Frame and Failure Records to assist in duplicating the failure conditions.
 

Trouble Code: P0802



Transmission Control Module (TCM) MIL Request Circuit

Trouble Code: P0815



Upshift Switch Circuit

Trouble Code: P0816



Downshift Switch Circuit

Trouble Code: P0826



TAP Up and Down Shift Switch Circuit

Possible Causes:



Inspect the wiring for poor electrical connections at the TCM. Inspect for the following conditions:

A bent terminal
 
A backed-out terminal
 
A damaged terminal
 
Poor terminal tension
 
A chafed wire
 
A broken wire inside the insulation
 

When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.You may have to drive the vehicle in order to experience a condition.
 

Trouble Code: P0827



TAP Up and Down Shift Switch Circuit Low

Possible Causes:



Inspect the wiring for poor electrical connections at the TCM. Inspect for the following conditions:

A bent terminal
 
A backed-out terminal
 
A damaged terminal
 
Poor terminal tension
 
A chafed wire
 
A broken wire inside the insulation
 

When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.You may have to drive the vehicle in order to experience a condition.
 

Trouble Code: P0828



TAP Up and Down Shift Switch Circuit High

Possible Causes:



Inspect the wiring for poor electrical connections at the TCM. Inspect for the following conditions:

A bent terminal
 
A backed-out terminal
 
A damaged terminal
 
Poor terminal tension
 
A chafed wire
 
A broken wire inside the insulation
 

When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.You may have to drive the vehicle in order to experience a condition.
 

Trouble Code: P0842



Transmission Pressure Switch 1 Circuit Low

Possible Causes:



Inspect the wiring for poor electrical connections at the TCM. Inspect for the following conditions:

A bent terminal
 
A backed-out terminal
 
A damaged terminal
 
Poor terminal tension
 
A chafed wire
 
A broken wire inside the insulation
 

When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.You may have to drive the vehicle in order to experience a condition.This DTC may indicate that SS1 is mechanically defective or the shift valve is stuck in the stroked state.When DTC P0752 and P0842 are set in combination, this may indicate a short to ground at the pressure switch circuit or the shift valve is stuck in the stroked state.
 

Trouble Code: P0843



Transmission Pressure Switch 1 Circuit High

Possible Causes:



Inspect the wiring for poor electrical connections at the TCM. Inspect for the following conditions:

A bent terminal
 
A backed-out terminal
 
A damaged terminal
 
Poor terminal tension
 
A chafed wire
 
A broken wire inside the insulation
 

When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.You may have to drive the vehicle in order to experience a condition.When DTC P0751 and P0843 are set in combination, this may indicate an open circuit condition is present at the pressure switch circuit or the shift valve 1 is stuck in the destroked position.This DTC may indicate that SS1 is mechanically defective.This DTC can be caused by a loss of prime.
 

Trouble Code: P0847



Transmission Pressure Switch 2 Circuit Low

Possible Causes:



Inspect the wiring for poor electrical connections at the TCM. Inspect for the following conditions:

A bent terminal
 
A backed-out terminal
 
A damaged terminal
 
Poor terminal tension
 
A chafed wire
 
A broken wire inside the insulation
 

When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.When DTC P0757 and P0847 are set in combination, this may indicate a short to ground is present at the pressure switch circuit or the shift valve is stuck in the stroked state.You may have to drive the vehicle in order to experience a condition.This DTC may indicate that SS2 is mechanically defective or shift valve 2 is stuck in the stroked state.
 

Trouble Code: P0848



Transmission Pressure Switch 2 Circuit High

Possible Causes:



Inspect the wiring for poor electrical connections at the TCM. Inspect for the following conditions:

A bent terminal
 
A backed-out terminal
 
A damaged terminal
 
Poor terminal tension
 
A chafed wire
 
A broken wire inside the insulation
 

When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.You may have to drive the vehicle in order to experience a condition.This DTC may indicate that SS2 is mechanically defective.When DTC P0756 and P0848 are set in combination, this may indicate an open circuit is present at the pressure switch circuit or the shift valve is stuck in the destroked position.This DTC can be caused by a loss of prime.
 

Trouble Code: P0851



Park/Neutral Position (PNP) Switch Circuit Low Voltage

Possible Causes:



It is possible for this DTC to set due to a stack-up or misalignment issue between the IMS and the P/N Switch, where no electrical fault is present. Ensure the gear shift selector cable is properly adjusted and there are no service bulletins that address this concern before replacing parts.
 

Trouble Code: P0852



Park/Neutral Position (PNP) Switch Circuit High Voltage

Possible Causes:



It is possible for this DTC to set due to a stack-up or misalignment issue between the IMS and the P/N Switch, where no electrical fault is present. Ensure the gear shift selector cable is properly adjusted and there are no service bulletins that address this concern before replacing parts.
 

Trouble Code: P0856



Traction Control Torque Request Circuit

Possible Causes:

C0298 A requested torque signal malfunction is only one possible cause for the PCM to lose the ability to perform traction control. DTC C0298 may set due to engine overheating, throttle actuator control failure, loss of ignition timing control by the PCM, etc. If DTC P0856 has not set, refer to the following in order to identify other possible causes of DTC C0298:



Symptoms - Engine Controls for the 4.3L engine
 
Symptoms - Engine Controls for the 8.1L engine
 
Symptoms - Engine Controls for the 4.8L, 5.3L, and 6.0L engines
 
Symptoms - Engine Controls for the 6.6L (LBZ and LLY) engine
 



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

Trouble Code: P0872



Transmission Pressure Switch 3 Circuit Low

Possible Causes:



Inspect the wiring for poor electrical connections at the TCM. Inspect for the following conditions:

A bent terminal
 
A backed-out terminal
 
A damaged terminal
 
Poor terminal tension
 
A chafed wire
 
A broken wire inside the insulation
 

When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.You may have to drive the vehicle in order to experience a condition.When DTC P0762 and P0872 are set in combination, this may indicate a short to ground is present at the pressure switch circuit.This DTC may indicate that SS3 is mechanically defective.This DTC can be set by a loss of prime.
 

Trouble Code: P0873



Transmission Pressure Switch 3 Circuit High

Possible Causes:



Inspect the wiring for poor electrical connections at the TCM. Inspect for the following conditions:

A bent terminal
 
A backed-out terminal
 
A damaged terminal
 
Poor terminal tension
 
A chafed wire
 
A broken wire inside the insulation
 

When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.You may have to drive the vehicle in order to experience a condition.When DTC P0761 and DTC P0873 are set in combination, this may indicate an open circuit condition is present in PS3.This DTC may indicate that SS3 is mechanically defective.This DTC can be caused by a loss of prime.
 

Trouble Code: P0877



Transmission Pressure Switch 4 Circuit Low

Possible Causes:



Inspect the wiring for poor electrical connections at the TCM. Inspect for the following conditions:

A bent terminal
 
A backed-out terminal
 
A damaged terminal
 
Poor terminal tension
 
A chafed wire
 
A broken wire inside the insulation
 

When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.You may have to drive the vehicle in order to experience a condition.This DTC could indicate a hydraulic leak path exhausting pressure from the reverse PS4.
 

Trouble Code: P0878



Transmission Pressure Switch 4 Circuit High

Possible Causes:



Inspect the wiring for poor electrical connections at the TCM. Inspect for the following conditions:

A bent terminal
 
A backed-out terminal
 
A damaged terminal
 
Poor terminal tension
 
A chafed wire
 
A broken wire inside the insulation
 

When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.You may have to drive the vehicle in order to experience a condition.This DTC could indicate a hydraulic leak path exhausting pressure from the reverse PS4.
 

Trouble Code: P0880



Transmission Control Module (TCM) Power Input Signal

Possible Causes:



Inspect the wiring for poor electrical connections at the TCM. Inspect for the following conditions:

A bent terminal
 
A backed-out terminal
 
A damaged terminal
 
Poor terminal tension
 
A chafed wire
 
A broken wire inside the insulation
 

When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.You may have to drive the vehicle in order to experience a condition.
 

Trouble Code: P0881



Transmission Control Module (TCM) Power Input Signal Performance

Possible Causes:



Inspect the wiring for poor electrical connections at the TCM. Inspect for the following conditions:

A bent terminal
 
A backed-out terminal
 
A damaged terminal
 
Poor terminal tension
 
A chafed wire
 
A broken wire inside the insulation
 

When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.You may have to drive the vehicle in order to experience a condition.Vehicle accessories imposing a large load on the battery circuit could also cause this DTC to set.Loose or corroded battery cables could allow this DTC to set.An internal TCM failure, due to a burn up circuit trace, could allow this DTC to set.Vehicle charging system failure may cause this DTC to set under certain circumstances.A defective vehicle battery may induce this DTC.Running the engine with a battery charger attached may cause this DTC to set.
 

 
label.common.footer.alt.autozoneLogo