DeVille, Eldorado, Seville 1999-2005

4.6L V8 VIN Y Auto 2

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Trouble Code: P0155



HO2S-21 (Bank 2 Sensor 1) Heater Circuit Malfunction

Possible Causes:



HO2S heater high side driver circuit has high resistance (open)
 
HO2S heater low side driver circuit has high resistance (open)
 
HO2S heater power circuit is open (test O2S fuse in fuse block)
 
HO2S heater element is damaged or has failed
 
PCM has failed
 

Trouble Code: P0171



Fuel Trim System Lean (Bank 1)

Possible Causes:



Air leaks in intake manifold, exhaust pipes or exhaust manifold
 
Fuel control sensor is out of calibration (ECT, IAT or MAF)
 
Low fuel pressure (fuel filter clogged, pressure regulator failure)
 
One or more injectors restricted or pressure regulator has failed
 
HO2S element is contaminated, deteriorated or has failed
 
Vacuum hose is disconnected, broken, leaking or loose
 

Trouble Code: P0172



Fuel Trim System Rich (Bank 1)

Possible Causes:



Base engine "mechanical" fault affecting one or more cylinders
 
EVAP system component has failed or canister fuel saturated
 
Fuel control sensor is out of calibration (i.e., ECT, IAT or MAF)
 
Fuel delivery system supplying too much fuel during cruise or idle periods (e.g., faulty fuel pump, or faulty pressure regulator)
 
Fuel injector(s) is leaking or stuck partially open (one or more)
 
HO2S is contaminated, deteriorated or it has failed
 

Trouble Code: P0174



Fuel Trim System Lean (Bank 2)

Possible Causes:



Air leaks in intake manifold, exhaust pipes or exhaust manifold
 
Fuel control sensor is out of calibration (ECT, IAT or MAF)
 
Low fuel pressure (fuel filter clogged, pressure regulator failure)
 
One or more injectors restricted or pressure regulator has failed
 
HO2S element is contaminated, deteriorated or has failed
 
Vacuum hose is disconnected, broken, leaking or loose
 

Trouble Code: P0175



Fuel Trim System Rich (Bank 2)

Possible Causes:



Base engine "mechanical" fault affecting one or more cylinders
 
Excess fuel vapors in crankcase (the oil needs to be changed)
 
EVAP system component has failed or canister fuel saturated
 
Fuel control sensor is out of calibration (i.e., ECT, IAT or MAF)
 
Fuel delivery system supplying too much fuel during cruise or idle periods (e.g., faulty fuel pump, or faulty pressure regulator)
 
Fuel injector(s) is leaking or stuck partially open (one or more)
 
HO2S is contaminated, deteriorated or it has failed
 

Trouble Code: P0201



Fuel Injector 1 Control Circuit Malfunction

Possible Causes:



Injector 1 control circuit is open or grounded between the injector and the PCM
 
Injector 1 power circuit is open (test INJ fuse in fuse block)
 
Injector 1 is damaged or has failed
 
PCM is damaged
 

Trouble Code: P0202



Fuel Injector 2 Control Circuit Malfunction

Possible Causes:



Injector 2 control circuit is open or grounded between the injector and the PCM
 
Injector 2 power circuit is open (test INJ fuse in fuse block)
 
Injector 2 is damaged or has failed
 
PCM is damaged
 

Trouble Code: P0203



Fuel Injector 3 Control Circuit Malfunction

Possible Causes:



Injector 3 control circuit is open or grounded between the injector and the PCM
 
Injector 3 power circuit is open (test INJ fuse in fuse block)
 
Injector 3 is damaged or has failed
 
PCM is damaged
 

Trouble Code: P0204



Fuel Injector 4 Control Circuit Malfunction

Possible Causes:



Injector 4 control circuit is open or grounded between the injector and the PCM
 
Injector 4 power circuit is open (test INJ fuse in fuse block)
 
Injector 4 is damaged or has failed
 
PCM is damaged
 

Trouble Code: P0205



Fuel Injector 5 Control Circuit Malfunction

Possible Causes:



Injector 5 control circuit is open or grounded between the injector and the PCM
 
Injector 5 power circuit is open (test INJ fuse in fuse block)
 
Injector 5 is damaged or has failed
 
PCM is damaged
 

Trouble Code: P0206



Fuel Injector 6 Control Circuit Malfunction

Possible Causes:



Injector 6 control circuit is open or grounded between the injector and the PCM
 
Injector 6 power circuit is open (test INJ fuse in fuse block)
 
Injector 6 is damaged or has failed
 
PCM is damaged
 

Trouble Code: P0207



Fuel Injector 7 Control Circuit Malfunction

Possible Causes:



Injector 7control circuit is open or grounded between the injector and the PCM
 
Injector 7 power circuit is open (test INJ fuse in fuse block)
 
Injector 7 is damaged or has failed
 
PCM is damaged
 

Trouble Code: P0208



Fuel Injector 8 Control Circuit Malfunction

Possible Causes:



Injector 8 control circuit is open or grounded between the injector and PCM
 
Injector 8 power circuit is open (test INJ fuse in fuse block)
 
Injector 8 is damaged or has failed
 
PCM is damaged
 

Trouble Code: P0218



Transaxle Fluid Over-Temperature (4L65E, 4L80-E)

Possible Causes:



ATF is low, contaminated, burnt or dirty
 
Engine cooling system has an airflow restriction
 
Transmission cooling system has an airflow restriction
 
Transmission cooler lines are bent, damaged or restricted
 
Transmission internal failure (i.e., low line pressure, TCC fault)
 

Trouble Code: P0230



Fuel Pump Control Circuit Malfunction

Possible Causes:



Fuel pump relay power circuit is open (test B+ from fuse box)
 
Fuel pump control circuit is open or shorted to ground
 
Fuel pump control circuit is shorted to system power
 
PCM has failed
 

Trouble Code: P0231



Fuel Pump Feedback Circuit Low Input

Possible Causes:



Fuel pump relay power circuit is open (test B+ from fuse center)
 
Fuel pump control circuit is open or shorted to ground
 
Fuel pump control circuit is shorted to system power
 
PCM has failed
 

Trouble Code: P0232



Fuel Pump Feedback Circuit High Input

Possible Causes:



Fuel pump relay is sticking (closed), damaged or has failed
 
Fuel pump ground circuit has a high resistance condition
 
Fuel pump feedback circuit is shorted to system power
 
PCM has failed
 

Trouble Code: P0300



Engine Misfire Detected

Possible Causes:



Base engine mechanical or fuel metering fault that affects one or more cylinders
 
EGR valve is stuck open or the PCV system has a vacuum leak
 
EVAP system problem or the EVAP canister is fuel saturated
 
Ignition system fault (a coil) that affects more than one cylinder
 

Trouble Code: P0301



Cylinder 1 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 1
 
Fuel component fault that affects only Cylinder 4 (i.e., a dirty or sticking fuel injector)
 
Ignition system problem (coil, plug) that affects only Cylinder 1
 

Trouble Code: P0302



Cylinder 2 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 2
 
Fuel component fault that affects only Cylinder 4 (i.e., a dirty or sticking fuel injector)
 
Ignition system problem (coil, plug) that affects only Cylinder 2
 

Trouble Code: P0304



Cylinder 4 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 4
 
Fuel component fault that affects only Cylinder 4 (i.e., a dirty or sticking fuel injector)
 
Ignition system problem (coil, plug) that affects only Cylinder 4
 

Trouble Code: P0305



Cylinder 5 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 5
 
Fuel component fault that affects only Cylinder 4 (i.e., a dirty or sticking fuel injector)
 
Ignition system problem (coil, plug) that affects only Cylinder 5
 

Trouble Code: P0306



Cylinder 6 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 6
 
Fuel component fault that affects only Cylinder 4 (i.e., a dirty or sticking fuel injector)
 
Ignition system problem (coil, plug) that affects only Cylinder 6
 

Trouble Code: P0307



Cylinder 7 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 7
 
Fuel component fault that affects only Cylinder 4 (i.e., a dirty or sticking fuel injector)
 
Ignition system problem (coil, plug) that affects only Cylinder 7
 

Trouble Code: P0308



Cylinder 8 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 8
 
Fuel component fault that affects only Cylinder 4 (i.e., a dirty or sticking fuel injector)
 
Ignition system problem (coil, plug) that affects only Cylinder 8
 

Trouble Code: P0321



ICM 4X Reference Circuit Malfunction

Possible Causes:



Fuel control signal circuit is open
 
Fuel control signal circuit is shorted to ground
 
IC module is damaged or has failed
 
PCM has failed
 
TSB 71-65-69 contains a repair procedure for this code
 

Trouble Code: P0325



Knock Sensor Module 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: P0326



Knock Sensor Excessive Spark Retard

Possible Causes:



Enable Service Spark Command with Scan Tool - adjust timing
 
Check engine for possible source of an engine knock condition
 
This vehicle requires the use of premium fuel - verify its use
 
Knock sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0327



Knock Sensor Circuit Low Input

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 has failed
 
PCM has failed
 

Trouble Code: P0335



CKP Sensor 'A' Circuit Malfunction

Possible Causes:



CKP sensor signal (+) circuit is open or shorted to ground
 
CKP sensor signal (-) circuit is open or shorted to ground
 
CKP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0336



Crankshaft Position Sensor 'A' Range/Performance

Possible Causes:



Check for signs of a loose connection at the harness connector
 
CKP sensor signal (+) circuit is open or shorted to ground
 
CKP sensor signal (-) circuit is open or shorted to ground
 
CKP sensor is damaged or has failed (an intermittent fault)
 
PCM has failed
 

Trouble Code: P0340



CMP Sensor Circuit Malfunction

Possible Causes:



CMP sensor signal (+) or (-) circuit is open or shorted to ground
 
CMP sensor is damaged or it failed (check the reluctor wheel)
 
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 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
 

Trouble Code: P0351



Ignition Coil 1 Control Circuit Malfunction

Possible Causes:



IC circuit is shorted to ground between the coil and the PCM
 
Ignition Coil (COP) 1 is damaged or has failed
 
PCM has failed
 

Trouble Code: P0352



Ignition Coil 2 Control Circuit Malfunction

Possible Causes:



IC circuit is shorted to ground between the coil and the PCM
 
Ignition Coil (COP) 2 is damaged or has failed
 
PCM has failed
 

Trouble Code: P0353



Ignition Coil 3 Control Circuit Malfunction

Possible Causes:



IC circuit is shorted to ground between the coil and the PCM
 
Ignition Coil (COP) 3 is damaged or has failed
 
PCM has failed
 

Trouble Code: P0354



Ignition Coil 4 Control Circuit Malfunction

Possible Causes:



IC circuit is shorted to ground between the coil and the PCM
 
Ignition Coil (COP) 4 is damaged or has failed
 
PCM has failed
 

Trouble Code: P0355



Ignition Coil 5 Control Circuit Malfunction

Possible Causes:



IC circuit is shorted to ground between the coil and the PCM
 
Ignition Coil (COP) 5 is damaged or has failed
 
PCM has failed
 

Trouble Code: P0356



Ignition Coil 6 Control Circuit Malfunction

Possible Causes:



IC circuit is shorted to ground between the coil and the PCM
 
Ignition Coil (COP) 6 is damaged or has failed
 
PCM has failed
 

Trouble Code: P0357



Ignition Coil 7 Control Circuit Malfunction

Possible Causes:



IC circuit is shorted to ground between the coil and the PCM
 
Ignition Coil (COP) 7 is damaged or has failed
 
PCM has failed
 

 
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