DeVille, Eldorado, Seville 1999-2005

4.6L V8 VIN Y Auto 3

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Trouble Code: P0358



Ignition Coil 8 Control Circuit Malfunction

Possible Causes:



IC circuit is shorted to ground between the coil and the PCM
 
Ignition Coil (COP) 8 is damaged or has failed
 
PCM has failed
 

Trouble Code: P0371



IC 24X Signal Circuit Too Many Pulses

Possible Causes:



Battery charger connected to the vehicle with engine running
 
CMP sensor 24X signal wire is routed to close to the Generator, spark plug wires or any other possible cause of EMI/RFI
 
Reluctor wheel is damaged or the sensor is touching the wheel
 
PCM has failed
 
TSB 71-65-69 contains a repair procedure for this code
 

Trouble Code: P0372



IC 24X Signal Circuit Too Few Pulses

Possible Causes:



CMP sensor 24X signal wire is open or shorted to ground (fault may be intermittent)
 
CMP sensor or the Ignition Control Module is damaged or failed
 
PCM has failed
 
TSB 71-65-69 contains a repair procedure for this code
 

Trouble Code: P0385



Crankshaft Position Sensor 'B' Circuit Malfunction

Possible Causes:



Start attempt performed with a defective starter relay or starter, or while not in P/N
 
CKP Sensor 'B' signal circuit is open or shorted to ground
 
CKP Sensor 'B' VREF circuit is shorted to ground (a No Start)
 
CKP Sensor 'B' is damaged or has failed
 

Trouble Code: P0386



Crankshaft Position Sensor 'B' Performance

Possible Causes:



CKP Sensor 'B' signal circuit is open (an intermittent fault)
 
CKP Sensor 'B' signal circuit is shorted to ground (intermittent)
 
CKP Sensor 'B' VREF circuit is open (an intermittent fault)
 
CKP Sensor 'B' ground circuit is open (an intermittent fault)
 
CKP Sensor 'B' is damaged or has failed
 

Trouble Code: P0401



Insufficient EGR Flow Detected

Possible Causes:



Base engine problem or any other problem that causes the engine to run poorly
 
EGR passages or intake passages clogged or restricted
 
EGR pipe is clogged, dirty or otherwise restricted
 
EGR vacuum hoses damaged, loose or routed incorrectly
 
EGR solenoid valve is clogged (carbon), damaged or has failed
 
MAP sensor is dirty, damaged or it is "skewed"
 
TSB 71-65-26 contains a repair procedure for this code
 

Trouble Code: P0403



Exhaust Gas Recirculation Solenoid Circuit Malfunction

Possible Causes:



EGR solenoid control circuit is open or shorted to ground
 
EGR solenoid control circuit is shorted to system power (B+)
 
EGR solenoid high control (VREF) circuit is open
 
EGR solenoid is damaged or 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 circuit or the 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: P0410



Secondary AIR System Performance

Possible Causes:



AIR solenoid power circuit is open (check the U/H IGN fuse)
 
AIR pump is damaged or has failed (inspect air pump for water)
 
AIR system check valves and/or pipes are damaged or leaking
 
AIR system hoses or lines are damaged, pinched or kinked
 
Base engine problem (e.g., excessive exhaust back pressure)
 
PCM has failed
 
TSB 02-06-04-024 contains a repair procedure for this code
 
TSB 03-06-04-013 contains a repair procedure for this code
 

Trouble Code: P0412



Secondary Air System Solenoid Circuit Fault (Bank 1)

Possible Causes:



AIR solenoid control circuit is open, shorted to ground or B+
 
AIR solenoid power circuit is open (test power from IGN1 fuse)
 
AIR solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P0418



Secondary Air Pump Relay Control Circuit Malfunction (Bank 2)

Possible Causes:



AIR relay control circuit is open, shorted to ground or power
 
AIR relay control circuit is shorted to system power (B+)
 
AIR relay power circuit is open (test power from IGN fuse)
 
AIR relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P0419



Secondary Air Pump Relay Control Circuit Malfunction (Bank 2)

Possible Causes:



AIR relay control circuit is open, shorted to ground or shorted to system power (B+)
 
AIR relay power circuit is open (test power from IGN fuse)
 
AIR relay 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)
 

Trouble Code: P0440



EVAP System Malfunction

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 vapor line(s) is clogged, damaged or disconnected
 
Purge valve vapor line is clogged, damaged, or disconnected
 
Purge or vent solenoid power circuit is open (check the fuse)
 
PCM has failed
 

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 vapor line(s) is clogged, damaged or disconnected
 
Purge valve vapor line is clogged, damaged, or disconnected
 
Purge solenoid or Vent solenoid has a small leaking (sticking)
 
PCM has failed
 

Trouble Code: P0443



EVAP Solenoid No. 1 Control Circuit Malfunction

Possible Causes:



Purge Solenoid 1 control circuit is open or shorted to ground
 
Purge Solenoid 1 control circuit is shorted to system power
 
Purge Solenoid 1 power circuit is open (test RUN/CRANK fuse)
 
Purge Solenoid 1 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
 
FTP sensor is out-of-calibration, damaged or "skewed"
 
PCM has failed
 

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 VENT SOL fuse)
 
Vent solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P0452



Fuel Tank Pressure Sensor Circuit Low Input

Possible Causes:



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

Trouble Code: P0453



Fuel Tank Pressure Sensor Circuit High Input

Possible Causes:



FTP sensor signal circuit is shorted to VREF or system power
 
FTP sensor ground circuit is open between sensor and PCM
 
FTP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0461



Fuel Level Sensor Signal Range/Performance

Possible Causes:



Fuel level sensor signal circuit is open or shorted to ground between the fuel level sensor and the PCM connector
 
Fuel level sensor ground circuit is open or has high resistance
 
Fuel level sender is damaged, binding or not aligned properly
 
Instrument cluster or the PCM has failed
 

Trouble Code: P0462



Fuel Level Sensor Low Input

Possible Causes:



Fuel level sensor signal circuit is shorted to ground between the fuel level sensor and the PCM connector
 
Fuel level sender is damaged, binding or not aligned properly
 
PCM has failed
 

Trouble Code: P0463



Fuel Level Sensor Circuit 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: P0480



Cooling Fan Relay 1 Control Circuit Malfunction

Possible Causes:



Fan control relay control circuit is open or shorted to ground
 
Fan control relay control circuit is shorted to system power
 
Fan control relay power circuit is open (check Cool Fan 1 fuse)
 
Fan control relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P0481



Cooling Fan Relay 2 Control Circuit Malfunction

Possible Causes:



Fan control relay control circuit is open or shorted to ground
 
Fan control relay control circuit is shorted to system power
 
Fan control relay power circuit is open (check Cool Fan 2 fuse)
 
Fan control relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P0502



VSS Circuit Low Input (4T80-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



Vehicle Speed Sensor Circuit Malfunction (4T80-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)
 
TSB 99-07-30-015A contains a repair procedure for this code
 

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)
 
Idle air inlet passage or throttle bore is dirty or full of deposits
 
IAC solenoid control circuit has a high resistance condition
 
IAC valve is damaged or has failed
 
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
 
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: P0532



A/C Refrigerant Pressure Sensor Circuit Low Input

Possible Causes:



ACP sensor signal circuit is shorted to ground
 
ACP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0533



A/C Refrigerant Pressure Sensor Circuit High Input

Possible Causes:



ACP sensor signal circuit is open between the sensor and PCM
 
ACP sensor ground circuit is open
 
ACP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0550



Power Steering Switch Circuit Low Input

Possible Causes:



PSP switch signal circuit is open or shorted to ground
 
PSP switch power circuit is open (test CRUISE fuse in R/CTR)
 
ACP sensor is damaged (sticking open) or has failed
 
PCM has failed
 

Trouble Code: P0560



System Voltage Malfunction

Possible Causes:



Check for high resistance at the battery connections or at the Underhood Fuse Block power circuit connection to the PCM
 
Check the drive belt for excessive wear and the proper tension
 
Check the condition of the battery and the Generator output
 
Vehicle may have been used to jump-start another vehicle
 

Trouble Code: P0562



System Voltage Too Low

Possible Causes:



Check for high resistance at battery connections or the U/H Fuse Block power circuit
 
Check the drive belt for excessive wear and the proper tension
 
Check the condition of the battery and the Generator output
 
Vehicle may have been used to jump-start another vehicle
 

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 be overcharging)
 
Vehicle may have been used to jump-start another vehicle
 

Trouble Code: P0574



Vehicle Speed Too High - Cruise Control Disabled

Possible Causes:



Severe wheel spin condition due to icy, wet/slippery conditions
 
Vehicle operated at too high a rate of speed
 
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.
 

 
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