Avalanche, Sierra, Silverado, C&K Series, 1999-2005

6.0L V8 VIN U Auto 3

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Trouble Code: P0563



System Voltage Too High

Possible Causes:



Check the condition of the battery (it may be worn out)
 
Test the operation of the Generator (it may have failed)
 
Vehicle may have been used to jump-start another vehicle
 

Trouble Code: P0601



Control Module ROM Malfunction

Possible Causes:



The PCM must be replaced to correct this problem. A new PCM must be programmed with the correct software/calibration.
 
TSB 67-65-23 contains a repair procedure for this code
 

Trouble Code: P0602



Control Module Not Programmed

Possible Causes:



Reprogram the PCM with the correct software and calibration. If this step does not correct the problem, the PCM must be replaced and programmed with the correct software/calibration.
 

Trouble Code: P0603



Control Module Long Term Memory Reset

Possible Causes:



An interruption to the PCM main power and/or ground circuits
 
Check the PCM power and ground circuits and make repairs as necessary. Clear the codes and recheck. If it resets, the PCM must be replaced and programmed with the correct software.
 

Trouble Code: P0604



Control Module Random Access Memory Failure

Possible Causes:



The PCM must be replaced to correct this problem. A new PCM must be programmed with the correct software/calibration.
 

Trouble Code: P0605



Control Module Programming Read Only Memory

Possible Causes:



The PCM must be replaced to correct this problem. A new PCM must be programmed with the correct software/calibration.
 

Trouble Code: P0606



Control Module Internal Performance

Possible Causes:



The PCM must be replaced to correct this problem. A new PCM must be programmed with the correct software/calibration.
 

Trouble Code: P0607



Control Module Performance

Possible Causes:



The PCM must be replaced to correct this problem. A new PCM must be programmed with the correct software/calibration.
 

Trouble Code: P0608



Vehicle Speed Output Circuit Malfunction

Possible Causes:



VSS output signal circuit is open, shorted to ground or to power
 
VSS output signal problem related to the Instrument Cluster or the Electronic Suspension Control Module (internal problem)
 
PCM has failed
 

Trouble Code: P0611



Control Module Performance

Possible Causes:



FICM is damaged
 

Trouble Code: P0615



Starter Relay Control Circuit Malfunction

Possible Causes:



Starter relay control circuit is open or shorted to ground
 
Starter relay control circuit is shorted to system power (B+)
 
Starter relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P0641



5-Volt Reference 1 Circuit Malfunction

Possible Causes:



5v VREF circuit is shorted to chassis or sensor ground
 
5v VREF circuit to MAP or TP sensor circuit is shorted to (B+)
 
PCM has failed
 

Trouble Code: P0650



Malfunction Indicator Lamp Circuit Malfunction

Possible Causes:



MIL control circuit is open or shorted to ground
 
MIL control circuit is shorted to system power
 
MIL control power circuit is open in the Instrument Cluster
 
MIL (the lamp) is damaged or has failed
 
Instrument Cluster or the PCM has failed
 

Trouble Code: P0651



5-Volt Reference 2 Circuit Malfunction

Possible Causes:



5v VREF circuit is shorted to chassis or sensor ground
 
5v VREF circuit to MAP or TP sensor circuit is shorted to (B+)
 
PCM has failed
 

Trouble Code: P0700



Malfunction Indicator Lamp Circuit Malfunction (TCM)

Possible Causes:



MIL control circuit is shorted to ground
 
Check the TCM for any trouble codes in memory that are responsible for the request to turn on the MIL
 
TCM has failed
 

Trouble Code: P0711



TFT Sensor Range/Performance (4L60-E, 4L80-E)

Possible Causes:



ATF fluid level too low or the fluid is contaminated or burnt
 
TFT sensor is contaminated, damaged or "skewed"
 
PCM has failed
 

Trouble Code: P0712



TFT Sensor Circuit Low Input (4L60-E, 4L80-E)

Possible Causes:



TFT sensor signal circuit is shorted to sensor or chassis ground
 
TFT sensor is damaged or has failed (it may be shorted)
 
PCM has failed
 

Trouble Code: P0713



TFT Sensor Circuit High Input (4L60-E. 4L80-E)

Possible Causes:



TFT sensor signal circuit is open between the sensor and PCM
 
TFT sensor signal circuit is shorted to VREF or system power
 
TFT sensor is damaged or has failed (it may be open)
 
PCM has failed
 

Trouble Code: P0716



A/T Input Shaft Speed Sensor Circuit Malfunction (4L80-E)

Possible Causes:



ISS positive (+) circuit is open, shorted to ground or to power
 
ISS negative (-) circuit is open, shorted to ground or to power
 
ISS terminals are corroded or damaged (check for moisture)
 
ISS signal wires routed too close to the Ignition system cables
 
PCM has failed
 

Trouble Code: P0717



A/T Input Shaft Speed Sensor Low Input (4L80-E)

Possible Causes:



ISS positive (+) circuit is open, shorted to ground or to power
 
ISS negative (-) circuit is open, shorted to ground or to power
 
ISS is damaged or has failed
 
PCM has failed
 
TSB 00-07-30-015 contains a repair procedure for this code
 

Trouble Code: P0719



TCC Brake Switch Circuit Low Input (4L60-E, 4L80-E)

Possible Causes:



TCC brake switch circuit is open or shorted to ground
 
TCC brake switch power circuit is open (check the CRUISE, FAN ALT or other related fuse in underhood junction block)
 
TCC brake switch is out of adjustment or damaged
 
PCM has failed
 

Trouble Code: P0724



TCC Brake Switch High Input (4L60-E, 4L80-E)

Possible Causes:



Check for ABS trouble codes (they can cause this code to set)
 
TCC brake switch circuit is shorted to system power
 
TCC brake switch is out of adjustment or damaged
 
PCM has failed
 

Trouble Code: P0730



Incorrect Gear Ratio (4L80-E)

Possible Causes:



ATF level is too low, or the fluid is burnt or contaminated
 
ISS or OSS signal circuit has an intermittent fault condition
 
Inspect for debris in the transmission pan or internal damaged
 
Possible vehicle overloading, exceeding the trailer towing limit, or towing in overdrive events occurred (discuss with customer)
 

Trouble Code: P0740



TCC Solenoid Circuit Malfunction (4L60-E, 4L65-E)

Possible Causes:



TCC solenoid control circuit is open, shorted to ground or to B+
 
TCC solenoid power circuit is open (test the TRANS fuse)
 
TCC solenoid is damaged or has failed
 
PCM has failed
 
TSB 01-07-30-002C contains a repair procedure for this code
 

Trouble Code: P0741



TCC System Stuck Off - Mechanical (4L80-E)

Possible Causes:



ATF level is too low, or the fluid is burnt or contaminated
 
Inspect transmission lines to radiator for bends or restrictions
 
Oil pressure screen is clogged or debris in the oil pan
 
TCC control valve is stuck "off" due to sediment or binding
 
TCC regulator valve is stuck "off" due to sediment or binding
 
TCC feed valve is stuck "off" due to sediment or binding
 
TCC solenoid valve O-ring or turbine shaft seals leaking or cut
 

Trouble Code: P0742



TCC System Stuck Off - Mechanical (4L60-E)

Possible Causes:



Exhaust orifice in the TCC solenoid valve is clogged
 
Converter clutch apply valve stuck in the "on" (apply) position
 
Valve body gasket is damaged or misaligned
 
Release pass is clogged or restricted
 
Transmission cooler line is bent or restricted
 

Trouble Code: P0751



A/T 1-2 Shift Solenoid - No 1st Or 4th Gear (4L60-E, 4L65-E, 4L80-E)

Possible Causes:



ATF is burnt or contaminated, or the level is incorrect
 
Transmission has an internal damage to the torque converter
 
Shift solenoid valve seals are damaged or leaking
 
Transmission has failed
 

Trouble Code: P0752



A/T 1-2 Shift Solenoid - No 2nd Or 3rd Gear (4L60-E, 4L80-E)

Possible Causes:



ATF is burnt or contaminated, or the level is incorrect
 
Transmission has an internal damage to the torque converter
 
Shift solenoid valve seals are damaged or leaking
 
Transmission has failed
 

Trouble Code: P0753



A/T 1-2 Shift Solenoid Circuit Malfunction (4L60-E, 4L80-E)

Possible Causes:



1-2 shift solenoid control circuit is open or shorted to ground
 
1-2 shift solenoid control circuit is shorted to system power
 
1-2 shift solenoid is damaged or has failed
 
PCM has failed
 
TSB 01-07-30-002C contains a repair procedure for this code
 

Trouble Code: P0756



2-3 Shift Solenoid - No 2nd Or 3rd Gear (4L60-E, 4L65-E)

Possible Causes:



ATF is burnt or contaminated
 
Transmission has plugged or restricted fluid circuits
 
Shift solenoid valve seals are leaking or damaged
 
Transmission has failed
 
TSB 01-07-30-036A contains a repair procedure for this code
 

Trouble Code: P0758



A/T 2-3 Shift Solenoid Circuit Malfunction (4L60-E, 4L80-E)

Possible Causes:



2-3 shift solenoid control circuit is open or shorted to ground
 
2-3 shift solenoid control circuit is shorted to system power
 
2-3 shift solenoid power circuit is open (test the TRANS fuse)
 
2-3 shift solenoid is damaged or has failed
 
PCM has failed
 
TSB 01-07-30-002C contains a repair procedure for this code
 

Trouble Code: P0785



A/T 3-2 Shift Solenoid Circuit Malfunction (4L60-E)

Possible Causes:



3-2 shift solenoid control circuit is open, shorted to ground or shorted to system power
 
3-2 shift solenoid power circuit is open (check the TRANS fuse)
 
3-2 shift solenoid is damaged or has failed
 
PCM has failed
 
TSB 01-07-30-002C contains a repair procedure for this code
 

Trouble Code: P0850



Title: A/T TCC PWM Solenoid Malfunction (4L60-E, 4L65-E)

Possible Causes:



ATF is burnt or contaminated
 
Transmission has an internal malfunction, or the TCC PWM solenoid seal is damaged
 
TCC PWM solenoid has failed, or the Transmission has failed
 

Trouble Code: P1020



Camshaft Phasing System Malfunction

Possible Causes:



AF fuel mode relay circuit (odd bank, even bank) is open
 
AF enable circuit is open or shorted to ground
 
FICM is damaged or it has failed
 

Trouble Code: P1021



CNG Fuel Injector 1 Circuit Malfunction

Possible Causes:



CNG fuel injector 1 control circuit is open or shorted to ground
 
CNG fuel injector 1 is damaged or it has failed
 
FICM has failed
 

Trouble Code: P1022



CNG Fuel Injector 2 Circuit Malfunction

Possible Causes:



CNG fuel injector 2 control circuit is open or shorted to ground
 
CNG fuel injector 2 is damaged or it has failed
 
FICM has failed
 

Trouble Code: P1023



CNG Fuel Injector 3 Circuit Malfunction

Possible Causes:



CNG fuel injector 3 control circuit is open or shorted to ground
 
CNG fuel injector 3 is damaged or it has failed
 
FICM has failed
 

Trouble Code: P1024



CNG Fuel Injector 4 Circuit Malfunction

Possible Causes:



CNG fuel injector 4 control circuit is open or shorted to ground
 
CNG fuel injector 4 is damaged or it has failed
 
FICM has failed
 

Trouble Code: P1025



CNG Fuel Injector 5 Circuit Malfunction

Possible Causes:



CNG fuel injector 5 control circuit is open or shorted to ground
 
CNG fuel injector 5 is damaged or it has failed
 
FICM has failed
 

Trouble Code: P1026



CNG Fuel Injector 6 Circuit Malfunction

Possible Causes:



CNG fuel injector 6 control circuit is open or shorted to ground
 
CNG fuel injector 6 is damaged or it has failed
 
FICM has failed
 

 
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