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

4.3L V6 VIN X Auto 3

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Trouble Code: P0503



Title: VSS Circuit Malfunction (4L60-E, 4L80-E)

Possible Causes:



Output shaft rotor is chipped or damaged (intermittent fault)
 
OSS tip contains debris or metal shavings (an intermittent fault)
 
OSS (+) signal circuit is open or shorted to ground (intermittent)
 
OSS (-) signal circuit is open or shorted to ground (intermittent)
 
OSS is damaged or has failed (an intermittent fault)
 

Trouble Code: P0506



Idle Speed Too Low

Possible Causes:



Air inlet duct is collapsed, loose or air filter element is clogged
 
Base engine problem (i.e., compression or misfire condition)
 
IAC solenoid control circuit has a high resistance condition
 
IAC valve is damaged or has failed
 
Idle air inlet passage or throttle bore is dirty or full of deposits
 
MAF sensor is dirty, out-of-calibration or it is "skewed"
 
Throttle plate, throttle shaft or linkage is damaged or sticking
 
PCM has failed
 

Trouble Code: P0507



Idle Speed Too High

Possible Causes:



Engine vacuum leaks, PCM valve is leaking or the wrong valve
 
IAC valve is damaged or has failed
 
Idle air inlet passage or throttle bore is dirty or full of deposits
 
MAF sensor is dirty, "skewed" or installed improperly
 
Throttle plate, throttle shaft or linkage is damaged or sticking
 
TP sensor is out-of-range or "skewed" high
 
PCM has failed
 

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: P0611



Control Module Performance

Possible Causes:



FICM is damaged
 

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: 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: 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: 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: 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: P0748



Pressure Control Solenoid Circuit Malfunction (4L60-E, 4L65-E)

Possible Causes:



PC solenoid high side circuit is open, shorted to ground or B+
 
PC solenoid low side circuit is open, shorted to ground or to B+
 
PC solenoid high or low side driver is damaged or has failed
 

Trouble Code: P0751



A/T 1-2 Shift Solenoid - No 1st or 4th 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: P0752



A/T 1-2 Shift Solenoid - No 2nd Or 3rd Gear (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 57-65-08A contains a repair procedure for this code
 

Trouble Code: P0756



2-3 Shift Solenoid - No 2nd Or 3rd Gear (4L80-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
 

Trouble Code: P0757



2-3 Shift Solenoid - No 3rd Or 4th Gear (4T60-E, 4T65-E)

Possible Causes:



ATF is burnt or contaminated
 
Transmission has plugged or restricted fluid circuits
 
Shift solenoid valve seals are leaking or damaged, or the Transmission has failed
 
TSB 01-07-30-038 contains a repair procedure for this code
 

Trouble Code: P0758



A/T 2-3 Shift Solenoid Circuit Malfunction (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 57-65-08A contains a repair procedure for this code
 

Trouble Code: P0785



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

Possible Causes:



3-2 shift solenoid control circuit is open or shorted to ground
 
3-2 shift solenoid control circuit is shorted to system power
 
3-2 shift solenoid power circuit is open (test the TRANS fuse)
 
3-2 shift solenoid is damaged or has failed
 
PCM 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
 

Trouble Code: P1027



CNG Fuel Injector 7 Circuit Malfunction

Possible Causes:



CNG fuel injector 7 control circuit is open or shorted to ground
 
CNG fuel injector 7 is damaged or it has failed
 
FICM has failed
 

Trouble Code: P1028



CNG Fuel Injector 8 Circuit Malfunction

Possible Causes:



CNG fuel injector 8 control circuit is open or shorted to ground
 
CNG fuel injector 8 is damaged or it has failed
 
FICM has failed
 

Trouble Code: P1106



MAP Sensor Circuit Intermittent High Input

Possible Causes:



MAP sensor signal circuit is shorted to VREF (intermittent fault)
 
MAP sensor ground circuit is open (intermittent fault)
 
MAP sensor is damaged or has failed
 
PCM has failed
 

 
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