Express, Savana, G1500, G2500, G3500, 1998-2005

5.0L V8 VIN M 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: 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: 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: 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: 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: 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
 

Trouble Code: P1107



MAP Sensor Circuit Intermittent Low Input

Possible Causes:



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

Trouble Code: P1111



IAT Sensor Circuit Intermittent High Input

Possible Causes:



IAT sensor signal circuit is open (intermittent fault)
 
IAT sensor ground circuit is open (intermittent fault)
 
IAT sensor is damaged (an intermittent "open" condition)
 
PCM has failed
 

Trouble Code: P1112



IAT Sensor Circuit Intermittent Low Input

Possible Causes:



IAT sensor signal circuit is shorted to ground (intermittent fault)
 
IAT sensor is damaged (an intermittent "shorted" condition)
 
PCM has failed
 

Trouble Code: P1114



ECT Sensor Circuit Intermittent Low Input

Possible Causes:



ECT sensor signal circuit shorted to ground (intermittent fault)
 
ECT sensor has failed (possible intermittent shorted condition)
 
PCM has failed
 

Trouble Code: P1115



ECT Sensor Circuit Intermittent High Input

Possible Causes:



ECT sensor signal circuit is open between the sensor and PCM
 
ECT sensor ground circuit is open between sensor and PCM
 
ECT sensor has failed (possible intermittent "open" condition)
 
PCM has failed
 

Trouble Code: P1121



TP Sensor Circuit High Input (Intermittent)

Possible Causes:



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

Trouble Code: P1122



TP Sensor Circuit Intermittent Low Input

Possible Causes:



TP sensor signal circuit is shorted to ground (intermittent fault)
 
TP sensor VREF circuit is open or grounded (intermittent fault)
 
TP sensor is damaged or has failed (possible intermittent short)
 
PCM has failed
 

Trouble Code: P1133



HO2S-11 (Bank 1 Sensor 1) Insufficient Switching

Possible Causes:



Air leaks present in the exhaust manifold or the exhaust pipes
 
Fuel pressure is too high (i.e., causing a rich air fuel mixture)
 
HO2S may be contaminated (due to improper fuel or silicone)
 
HO2S signal high or low reference circuit has high resistance
 
HO2S heater element has failed, or the heater circuit is open
 
PCM has failed
 

Trouble Code: P1134



HO2S-11 (Bank 1 Sensor 1) Transition Time Ratio

Possible Causes:



Air leaks present in the exhaust manifold or the exhaust pipes
 
HO2S may be contaminated (due to improper fuel or silicone)
 
HO2S signal low reference circuit has high resistance
 
HO2S heater element has failed, or the heater circuit is open
 
PCM has failed
 

Trouble Code: P1153



HO2S-21 (Bank 2 Sensor 1) Insufficient Switching

Possible Causes:



Air leaks present in the exhaust manifold or the exhaust pipes
 
Fuel pressure is too high (i.e., causing a rich air fuel mixture)
 
HO2S may be contaminated (due to improper fuel or silicone)
 
HO2S signal high or low reference circuit has high resistance
 
HO2S heater element has failed, or the heater circuit is open
 
MAP sensor or TP sensor is out-of-calibration or "skewed"
 
PCM has failed
 

Trouble Code: P1154



HO2S-21 (Bank 2 Sensor 1) Transition Time Ratio

Possible Causes:



Air leaks present in the exhaust manifold or the exhaust pipes
 
HO2S may be contaminated (due to improper fuel or silicone)
 
HO2S signal low reference circuit has high resistance
 
HO2S heater element has failed, or the heater circuit is open
 
PCM has failed
 

 
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