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

6.5L V8 VIN F Auto 2

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Trouble Code: P0269



Cylinder 3 Balance System Malfunction

Possible Causes:



Injector 3 fuel nozzle dirty, damaged or restricted
 
Fuel feed lines between the tank and fuel pump are restricted
 
Fuel filter id contaminated, dirty or clogged
 

Trouble Code: P0272



Cylinder 4 Balance System Malfunction

Possible Causes:



Injector 4 fuel nozzle dirty, damaged or restricted
 
Fuel feed lines between the tank and fuel pump are restricted
 
Fuel filter id contaminated, dirty or clogged
 

Trouble Code: P0275



Cylinder 5 Balance System Malfunction

Possible Causes:



Injector 5 fuel nozzle dirty, damaged or restricted
 
Fuel feed lines between the tank and fuel pump are restricted
 
Fuel filter id contaminated, dirty or clogged
 

Trouble Code: P0278



Cylinder 6 Balance System Malfunction

Possible Causes:



Injector 6 fuel nozzle dirty, damaged or restricted
 
Fuel feed lines between the tank and fuel pump are restricted
 
Fuel filter id contaminated, dirty or clogged
 

Trouble Code: P0281



Cylinder 7 Balance System Malfunction

Possible Causes:



Injector 7 fuel nozzle dirty, damaged or restricted
 
Fuel feed lines between the tank and fuel pump are restricted
 
Fuel filter id contaminated, dirty or clogged
 

Trouble Code: P0284



Cylinder 8 Balance System Malfunction

Possible Causes:



Injector 8 fuel nozzle dirty, damaged or restricted
 
Fuel feed lines between the tank and fuel pump are restricted
 
Fuel filter id contaminated, dirty or clogged
 

Trouble Code: P0300



Multiple Cylinder Misfire Detected

Possible Causes:



Base engine mechanical fault that affects one or more cylinders
 
Fuel injection (high pressure) nozzles or fuel lines leaking
 
Fuel injection nozzles stuck closed, dirty or restricted
 

Trouble Code: P0301



Cylinder 1 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 1
 
Fuel injection (high pressure) nozzle leaking only on Cylinder 1
 
Fuel injection nozzle stuck closed or dirty affecting Cylinder 1
 

Trouble Code: P0302



Cylinder 2 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 2
 
Fuel injection (high pressure) nozzle leaking only on Cylinder 2
 
Fuel injection nozzle stuck closed or dirty affecting Cylinder 2
 

Trouble Code: P0303



Cylinder 3 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 3
 
Fuel injection (high pressure) nozzle leaking only on Cylinder 3
 
Fuel injection nozzle stuck closed or dirty affecting Cylinder 3
 

Trouble Code: P0304



Cylinder 4 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 4
 
Fuel injection (high pressure) nozzle leaking only on Cylinder 4
 
Fuel injection nozzle stuck closed or dirty affecting Cylinder 4
 

Trouble Code: P0305



Cylinder 5 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 5
 
Fuel injection (high pressure) nozzle leaking only on Cylinder 5
 
Fuel injection nozzle stuck closed or dirty affecting Cylinder 5
 

Trouble Code: P0306



Cylinder 6 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 6
 
Fuel injection (high pressure) nozzle leaking only on Cylinder 6
 
Fuel injection nozzle stuck closed or dirty affecting Cylinder 6
 

Trouble Code: P0307



Cylinder 7 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 7
 
Fuel injection (high pressure) nozzle leaking only on Cylinder 7
 
Fuel injection nozzle stuck closed or dirty affecting Cylinder 7
 

Trouble Code: P0308



Cylinder 8 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 8
 
Fuel injection (high pressure) nozzle leaking only on Cylinder 8
 
Fuel injection nozzle stuck closed or dirty affecting Cylinder 8
 

Trouble Code: P0335



CKP Sensor Signal Range/Performance

Possible Causes:



CKP sensor signal circuit is open or shorted to ground
 
CKP sensor VREF circuit is open between the sensor and PCM
 
CKP sensor ground circuit is open
 
CKP sensor is damaged or it failed (check crankshaft sprocket)
 
PCM has failed
 

Trouble Code: P0370



Timing Reference High-Resolution System Performance

Possible Causes:



Optical fuel temperature sensor circuit has a problem
 
PCM has failed
 
Vehicle driven in an aggressive manner while low on fuel
 

Trouble Code: P0380



Glow Plug Range/Performance

Possible Causes:



Glow plug relay control circuit is open, shorted to power, or the ground circuit is open
 
Glow plug relay is stuck in "on" position causing constant power
 
Glow plug relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P0405



EGR Control BARO Sensor Circuit Low Input

Possible Causes:



EGR BARO sensor signal circuit is open
 
EGR BARO sensor signal circuit is shorted to ground
 
EGR BARO sensor VREF circuit is open or shorted to ground
 
EGR BARO sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0406



EGR Control BARO Sensor Circuit Low Input

Possible Causes:



EGR BARO sensor signal circuit is shorted to VREF or power
 
EGR BARO sensor ground circuit is open
 
EGR BARO sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0501



Vehicle Speed Sensor Range/Performance (4L60-E)

Possible Causes:



Output shaft rotor is chipped or damaged
 
Output shaft rotor is not aligned properly with the VSS unit
 
VSS tip contains debris or metal shavings (an intermittent fault)
 
VSS positive (+) signal circuit is open or shorted to ground
 
VSS negative (-) signal circuit is open or shorted to ground
 
VSS buffer is damaged, or one of the buffer circuits has failed
 
VSS is damaged or has failed
 

Trouble Code: P0502



Vehicle Speed Sensor Low Input (4L60-E)

Possible Causes:



Output shaft rotor is chipped or damaged
 
Output shaft rotor is not aligned properly with the VSS unit
 
VSS tip contains debris or metal shavings (an intermittent fault)
 
VSS (+) or (-) signal circuit is open or shorted to ground
 
VSS buffer is damaged, or one of the buffer circuits has failed
 
VSS is damaged or has failed
 

Trouble Code: P0503



VSS Circuit Malfunction (4L60-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: P0567



Cruise Control Resume Switch Circuit Malfunction

Possible Causes:



C/C resume switch is shorted to VREF or system power
 
C/C resume switch is stuck in the "on" position or has failed
 
PCM has failed
 

Trouble Code: P0568



Cruise Control Set Switch Circuit Malfunction

Possible Causes:



Set/Coast switch circuit is shorted to VREF or system power
 
Set/Coast switch is stuck in "on" position or it has failed
 
PCM has failed
 

Trouble Code: P0571



Cruise/Brake Switch Circuit Malfunction

Possible Causes:



Cruise brake switch signal circuit is shorted to ground
 
Cruise brake switch B+ circuit is open (test STOP/BRAKE fuse)
 
Cruise brake switch is damaged (closed) or has failed
 

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: 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: P0722



Output Shaft Speed Sensor Circuit Low Input (4L80-E)

Possible Causes:



OSS positive (+) circuit is open or shorted to ground
 
OSS negative (-) circuit is open or shorted to ground
 
OSS terminals are corroded or damaged (check for moisture)
 
PCM has failed
 

Trouble Code: P0723



Output Shaft Speed Sensor Circuit High Input (4L80-E)

Possible Causes:



OSS positive (+) circuit is open or shorted to system power
 
OSS negative (-) circuit is open or shorted to system power
 
OSS terminals are corroded or damaged (check for moisture)
 
PCM has failed
 

Trouble Code: P0751



A/T 1-2 Shift Solenoid - No 1st or 4th 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 internal damage (it may need to be replaced)
 

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 (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
 

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: P0758



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

Possible Causes:



2-3 shift solenoid control circuit is open, shorted to ground or 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
 

 
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