Escalade, Suburban, Tahoe, Yukon, Denali, DenaliXL, YukonXL 1999-2005

6.0L V8 VIN N Auto 2

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Trouble Code: P0308



Cylinder 8 Misfire Detected

Possible Causes:



Base engine mechanical problem that affects only Cylinder 8
 
Fuel component fault that affects only Cylinder 8 (i.e., a dirty or sticking fuel injector)
 
Ignition system problem (coil, plug) that affects only Cylinder 8
 

Trouble Code: P0325



Knock Sensor Circuit Malfunction

Possible Causes:



Knock sensor signal circuit is open, shorted to ground or power
 
Knock sensor ground circuit is open (i.e., not mounted properly)
 
Knock sensor is damaged or has failed
 
On modules with an integrated sensor, clear the codes and retest for codes. If the same code resets, the PCM has failed.
 

Trouble Code: P0327



Knock Sensor Circuit Low Input (Bank 1)

Possible Causes:



Knock sensor signal circuit is open, shorted to ground or power
 
Knock sensor ground circuit is open (check for proper torque)
 
Knock sensor is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0332



Knock Sensor Circuit Low Input (Bank 2)

Possible Causes:



Knock sensor signal circuit is open, shorted to ground or power
 
Knock sensor ground circuit is open (check for proper torque)
 
Knock sensor is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0335



CKP Sensor Circuit Malfunction

Possible Causes:



CKP sensor signal circuit is open or shorted to ground
 
CKP sensor ground (low reference) circuit is open
 
CKP sensor power circuit is open between sensor and the PCM
 
Crankshaft reluctor wheel is damaged or improper installation
 
CKP sensor contacting the reluctor wheel or it has failed
 
PCM has failed
 

Trouble Code: P0336



Crankshaft Reference Sensor Signal Range/Performance

Possible Causes:



CKP sensor connector is damaged, loose or shorted
 
CKP sensor signal circuit is open or shorted (intermittent fault)
 
CKP sensor contacting the reluctor wheel or it has failed
 
CKP sensor is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0341



CMP Sensor Signal Range/Performance

Possible Causes:



CMP sensor signal circuit is open, shorted to ground or VREF
 
CMP sensor is cracked or damaged (check the reluctor wheel)
 
CMP sensor wiring routed to close to Generator or plug wires
 
Reluctor wheel is damaged or the sensor is touching the wheel
 
PCM has failed
 

Trouble Code: P0351



Ignition Coil 1 Control Circuit Malfunction

Possible Causes:



IC circuit is open, shorted to ground or shorted to power (B+)
 
IC ground (Low REF) circuit or Module ground circuit is open
 
IC power circuit is open (check the INJ fuse in U/H fuse block)
 
Ignition Coil 1 is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0352



Ignition Coil 2 Control Circuit Malfunction

Possible Causes:



IC circuit is open, shorted to ground or shorted to power (B+)
 
IC ground (Low REF) circuit or Module ground circuit is open
 
IC power circuit is open (check the INJ fuse in U/H fuse block)
 
Ignition Coil 2 is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0353



Ignition Coil 3 Control Circuit Malfunction

Possible Causes:



IC circuit is open, shorted to ground or shorted to power (B+)
 
IC ground (Low REF) circuit or Module ground circuit is open
 
IC power circuit is open (check the INJ fuse in U/H fuse block)
 
Ignition Coil 3 is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0354



Ignition Coil 4 Control Circuit Malfunction

Possible Causes:



IC circuit is open, shorted to ground or shorted to power (B+)
 
IC ground (Low REF) circuit or Module ground circuit is open
 
IC power circuit is open (check the INJ fuse in U/H fuse block)
 
Ignition Coil 4 is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0355



Ignition Coil 5 Control Circuit Malfunction

Possible Causes:



IC circuit is open, shorted to ground or shorted to power (B+)
 
IC ground (Low REF) circuit or Module ground circuit is open
 
IC power circuit is open (check the INJ fuse in U/H fuse block)
 
Ignition Coil 5 is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0356



Ignition Coil 6 Control Circuit Malfunction

Possible Causes:



IC circuit is open, shorted to ground or shorted to power (B+)
 
IC ground (Low REF) circuit or Module ground circuit is open
 
IC power circuit is open (check the INJ fuse in U/H fuse block)
 
Ignition Coil 6 is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0357



Ignition Coil 7 Control Circuit Malfunction

Possible Causes:



IC circuit is open, shorted to ground or shorted to power (B+)
 
IC ground (Low REF) circuit or Module ground circuit is open
 
IC power circuit is open (check the INJ fuse in U/H fuse block)
 
Ignition Coil 7 is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0358



Ignition Coil 8 Control Circuit Malfunction

Possible Causes:



IC circuit is open, shorted to ground or shorted to power (B+)
 
IC ground (Low REF) circuit or Module ground circuit is open
 
IC power circuit is open (check the INJ fuse in U/H fuse block)
 
Ignition Coil 8 is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0404



EGR Open Position Signal Range/Performance

Possible Causes:



EGR sensor signal circuit is open, shorted to ground or power
 
EGR sensor ground or VREF circuit is open
 
EGR valve seat or pintle contains debris or carbon (inspect and clean)
 
EGR valve is contaminated, clogged, damaged or has failed
 
PCM has failed
 

Trouble Code: P0405



EGR Position Sensor Circuit Low Input

Possible Causes:



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

Trouble Code: P0420



Catalyst System Low Efficiency (Bank 1)

Possible Causes:



Air leaks at the exhaust manifold or in the exhaust pipes
 
Base engine problems (i.e., high engine oil or coolant usage)
 
Catalytic converter is damaged, contaminated or has failed
 
Continuous engine misfire conditions, or weak or low coil output
 
Front HO2S or rear HO2S is contaminated with fuel or moisture
 
Rear HO2S is loose in the mounting hole (check it for a leak)
 
TSB 81-65-37 contains a repair procedure for this code
 

Trouble Code: P0430



Catalyst System Low Efficiency (Bank 2)

Possible Causes:



Air leaks at the exhaust manifold or in the exhaust pipes
 
Base engine problems (i.e., high engine oil or coolant usage)
 
Catalytic converter is damaged, contaminated or has failed
 
Continuous engine misfire conditions, or weak or low coil output
 
Front HO2S or rear HO2S is contaminated with fuel or moisture
 
Rear HO2S is loose in the mounting hole (check it for a leak)
 
TSB 81-65-37 contains a repair procedure for this code
 

Trouble Code: P0442



EVAP System Small Leak (0.040") Detected

Possible Causes:



Charcoal canister is loaded with fuel or moisture
 
Fuel filler cap is loose, cross-threaded, damaged or wrong part
 
Fuel tank, fuel filler neck or fuel sending unit 'O' ring is leaking
 
Fuel tank pressure sensor is damaged, disconnected or it failed
 
Fuel tank or purge valve vapor lines clogged or disconnected
 
Purge solenoid or Vent solenoid has a small leaking (sticking)
 
PCM has failed
 

Trouble Code: P0443



EVAP Purge Solenoid Control Circuit Malfunction

Possible Causes:



Purge solenoid control circuit is open or shorted to ground
 
Purge solenoid control circuit is shorted to system power (B+)
 
Purge solenoid power circuit is open (test the ENG1 fuse)
 
Purge solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P0446



EVAP Vent System Performance

Possible Causes:



EVAP vent fresh air hose is clogged, kinked or restricted
 
EVAP Vent solenoid is contaminated, damaged or has failed
 
EVAP Canister plugged or severely restricted
 
Fuel Cap or EVAP Service Port leaking
 
Fuel vapor lines or purge lines damaged or leaking
 
FTP sensor is out-of-calibration, damaged or "skewed"
 
PCM has failed
 
TSB 02-06-04-037 contains a repair procedure for this code
 

Trouble Code: P0449



EVAP Vent Solenoid Control Circuit Malfunction

Possible Causes:



Vent solenoid control circuit is open or shorted to ground
 
Vent solenoid control circuit is shorted to system power (B+)
 
Vent solenoid power circuit is open (test the ENG1 fuse)
 
Vent solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P0455



EVAP System Large Leak (0.080") Detected

Possible Causes:



Fuel filler cap is very loose, missing or the wrong part
 
Fuel tank, fuel filler neck or fuel sending unit 'O' ring is leaking
 
Fuel tank pressure sensor is damaged, disconnected or it failed
 
Fuel tank vapor line(s) is clogged, damaged or disconnected
 
Purge valve vapor line is clogged, damaged, or disconnected
 
Purge solenoid is not opening (it may be damaged or sticking)
 
Vent solenoid is not closing (it may be damaged or sticking)
 
PCM has failed
 

Trouble Code: P0463



Fuel Level Sensor High Input

Possible Causes:



Fuel level sensor signal circuit is shorted to system power
 
Fuel level sensor ground circuit is open
 
Fuel level sender is damaged, binding or not aligned properly
 
PCM has failed
 

Trouble Code: P0496



EVAP Canister Purge System High Purge Flow

Possible Causes:



EVAP charcoal canister is damaged or restricted
 
EVAP purge pipe is damaged or restricted
 
FTP sensor is damaged or it has failed
 
Purge solenoid is damaged (it may be sticking)
 
Purge solenoid valve has failed
 

Trouble Code: P0502



VSS Circuit Low Input (4L60-E, 4L80-E)

Possible Causes:



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

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"
 
PCM has failed
 

Trouble Code: P0507



Idle Speed Too High

Possible Causes:



Engine vacuum leaks, PCM valve is leaking or the wrong valve
 
Idle air inlet passage or throttle bore is dirty or full of deposits
 
IAC valve is damaged or has failed
 
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: P0641



5-Volt Reference 1 Circuit Malfunction

Possible Causes:



5v VREF circuit to EOP sensor or MAP sensor is shorted to ground or it is shorted to system power
 
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
 

 
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