DeVille, Eldorado, Seville 1999-2005

4.6L V8 VIN 9 Auto 1

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4.6L V8 VIN 9 Auto

Trouble Code: P0030



HO2S-11 (Bank 1 Sensor 1) Heater Circuit Malfunction

Possible Causes:



HO2S low side circuit is shorted to ground or to the high side
 
HO2S high side circuit is shorted to ground or to the low side
 
HO2S heater is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0036



HO2S-12 (Bank 1 Sensor 2) Heater Circuit Fault

Possible Causes:



HO2S low side circuit is shorted to ground or to the high side
 
HO2S high side circuit is shorted to ground or to the low side
 
HO2S heater is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0101



MAF Sensor Signal Range/Performance

Possible Causes:



Base engine vacuum leak, PCV valve leaking or stuck open
 
Engine oil dipstick missing or not fully seated
 
MAF sensor element (wire) is contaminated or dirty
 
MAF sensor signal or ground circuit fault or sensor has failed
 
PCM has failed
 

Trouble Code: P0102



MAF Sensor Circuit Low Frequency

Possible Causes:



MAF sensor element hot wire contaminated or the sensor failed
 
MAF sensor signal shorted to ground or ground circuit problem
 
MAF sensor wiring routed close to the ignition wires, generator, solenoids or electric motors (this causes it to pick up EMI/RFI)
 
PCM has failed
 
TSB 71-65-26 contains a repair procedure for this code
 

Trouble Code: P0103



MAF Sensor Circuit High Frequency

Possible Causes:



MAF sensor power circuit has a high resistance condition
 
MAF sensor is contaminated, dirty or it has failed
 
MAF sensor wiring routed too close to the Generator or to close to ignition wires (this causes a EMI/REFI high frequency signal)
 
Water enters the air intake system reaches the MAF sensor, cools it, and causes it to indicate excessive airflow (check AIR system)
 
PCM has failed
 

Trouble Code: P0105



MAP Sensor Insufficient Activity

Possible Causes:



MAP sensor signal or ground circuit has high resistance
 
MAP sensor is contaminated (moisture or icing problems)
 
MAP sensor is damaged, sticking or has failed
 

Trouble Code: P0106



MAP Sensor Signal Range/Performance

Possible Causes:



MAP sensor seal is missing or damage, intake manifold leaks
 
MAP sensor is contaminated, dirty, skewed or has failed
 
MAP sensor vacuum line is loose, restricted or contains "ice"
 
PCM has failed
 

Trouble Code: P0107



MAP Sensor Circuit Low Input

Possible Causes:



MAP sensor signal circuit shorted to sensor or chassis ground
 
MAP sensor power circuit open between the sensor and PCM
 
MAP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0108



MAP Sensor Circuit High Input

Possible Causes:



MAP sensor signal circuit is open or it is shorted to VREF
 
MAP sensor ground circuit open between sensor and the PCM
 
MAP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0111



IAT Sensor Signal Range/Performance

Possible Causes:



IAT sensor signal circuit is open (intermittent fault)
 
IAT sensor signal circuit is shorted to ground (intermittent fault)
 
IAT sensor is contaminated, damaged or has failed
 
PCM has failed
 

Trouble Code: P0112



IAT Sensor Circuit Low Input

Possible Causes:



IAT sensor signal circuit is shorted to sensor or chassis ground
 
IAT sensor is damaged or has failed (it may be shorted)
 
PCM has failed
 

Trouble Code: P0113



IAT Sensor Circuit High Input

Possible Causes:



IAT sensor signal circuit is open between the sensor and PCM
 
IAT sensor signal circuit is shorted to VREF or system power
 
IAT sensor is damaged or has failed (it may be open)
 
PCM has failed
 

Trouble Code: P0116



ECT Sensor Signal Range/Performance

Possible Causes:



ECT sensor circuit has an intermittent high resistance condition
 
ECT sensor circuit has an intermittent grounded condition
 
ECT sensor is out of calibration or it is "skewed"
 

Trouble Code: P0117



ECT Sensor Circuit Low Input

Possible Causes:



ECT sensor connector is damaged or shorted
 
ECT sensor signal circuit shorted to sensor or chassis ground
 
ECT sensor is damaged or has failed (it may be shorted)
 
PCM has failed
 

Trouble Code: P0118



ECT Sensor Circuit High Input

Possible Causes:



ECT sensor signal circuit is open between the sensor and PCM
 
ECT sensor signal circuit is shorted to VREF or system power
 
ECT sensor is damaged or has failed (it may be open)
 
PCM has failed
 
TSB 71-65-25 contains a repair procedure for this code
 

Trouble Code: P0120



TP Sensor Signal Range/Performance

Possible Causes:



Misfire trouble code (DTP P0300 through P0308) is present
 
TP sensor signal circuit is shorted to ground (intermittent fault)
 
TP sensor signal circuit is open (an intermittent fault)
 
TP sensor is damaged or has failed (it may be cracked)
 

Trouble Code: P0121



TP Sensor Circuit Insufficient Activity

Possible Causes:



TP sensor signal circuit open or shorted to ground (intermittent)
 
TP sensor VREF circuit is open or shorted (intermittent fault)
 
TP sensor is damaged or it failed (may be cracked or sticking)
 

Trouble Code: P0122



TP Sensor Circuit Low Input

Possible Causes:



TP sensor signal circuit is shorted to ground or open (except 1996-1998 models)
 
TP sensor VREF circuit is open between sensor and PCM
 
TP sensor is damaged or it failed (it may be shorted)
 
PCM is damaged or has failed
 

Trouble Code: P0123



TP Sensor Circuit High Input

Possible Causes:



TP sensor connector is damaged, loose or open
 
TP sensor signal circuit is shorted to VREF or system power
 
TP sensor ground circuit is open between the sensor and PCM
 
TP sensor is damaged or it failed (it may be open)
 
PCM is damaged or has failed
 
TSB 71-65-25 contains a repair procedure for this code
 

Trouble Code: P0125



ECT Excessive Time To Enter Closed Loop

Possible Causes:



Check the operation of the thermostat (it may be stuck open)
 
Coolant level is too low, or the coolant mixture is incorrect
 
ECT sensor signal circuit has a high resistance condition
 
ECT sensor is damaged or it has failed
 

Trouble Code: P0128



ECT Sensor Below Thermostat Regulating Temperature

Possible Causes:



Check the operation of the thermostat (it may be stuck open)
 
ECT sensor is damaged or it has failed
 
Inspect for low coolant level or an incorrect coolant mixture
 
PCM has failed
 

Trouble Code: P0130



HO2S-11 (Bank 1 Sensor 1) Circuit Closed Loop Performance

Possible Causes:



EVAP system leaks or restrictions, charcoal canister problems
 
Fuel system restricted or fuel pressure regulator has failed
 
HO2S air reference hole plugged (check for dirt on the outside)
 
HO2S signal circuit shorted to low reference or chassis ground
 
HO2S is damaged or contaminated due to improper fuel usage
 
PCM has failed
 

Trouble Code: P0131



HO2S-11 (Bank 1 Sensor 1) Circuit Low Input

Possible Causes:



Air leaks in the exhaust system, intake manifold, vacuum lines
 
Engine misfire condition present (look for P0300 series codes)
 
Fuel system too lean (possible low fuel pressure, water in fuel)
 
HO2S signal circuit is shorted to the sensor or chassis ground
 
HO2S is damaged (i.e., cracked) or air reference hole clogged
 
PCM has failed
 

Trouble Code: P0132



HO2S-11 (Bank 1 Sensor 1) Circuit High Input

Possible Causes:



Fuel system is too rich (fuel pressure too high, fuel pressure regulator leaking, or one or more fuel injectors sticking/leaking)
 
HO2S element is silicon, water or fuel contaminated
 
HO2S signal tracking (water intrusion) in the connector causing a short between the HO2S signal and heater power circuits
 
PCM has failed
 

Trouble Code: P0133



HO2S-11 (Bank 1 Sensor 1) Slow Response

Possible Causes:



Exhaust leak present in the exhaust manifold or exhaust pipes
 
Fuel system is too rich (fuel pressure too high, fuel pressure regulator leaking, or one or more fuel injectors sticking/leaking)
 
HO2S element is silicon, water or fuel contaminated or it failed
 
TP sensor element broken (can cause false acceleration event)
 
PCM has failed
 

Trouble Code: P0134



HO2S-11 (Bank 1 Sensor 1) Insufficient Activity

Possible Causes:



HO2S heater is damaged or has failed
 
HO2S signal or ground circuit has a high resistance condition
 
HO2S signal circuit is open or shorted to system power (B+)
 
HO2S has failed (i.e., it is silicon, water or fuel contaminated)
 
PCM has failed
 

Trouble Code: P0135



HO2S-11 (Bank 1 Sensor 1) Heater Circuit Malfunction

Possible Causes:



HO2S heater ground circuit is open or has high resistance
 
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: P0137



HO2S-12 (Bank 1 Sensor 2) Circuit Low Input

Possible Causes:



Air leaks in the exhaust system, intake manifold, vacuum lines
 
Engine misfire condition present (look for P0300 series codes)
 
Fuel system too lean (possible low fuel pressure, water in fuel)
 
HO2S signal circuit is shorted to the sensor or chassis ground
 
HO2S is damaged (i.e., cracked) or air reference hole clogged
 
PCM has failed
 

Trouble Code: P0138



HO2S-12 (Bank 1 Sensor 2) Circuit High Input

Possible Causes:



Fuel system is too rich (fuel pressure too high, fuel pressure regulator leaking, or one or more fuel injectors sticking/leaking)
 
HO2S element is silicon, water or fuel contaminated
 
HO2S signal tracking (water intrusion) in the connector causing a short between the HO2S signal and heater power circuits
 
PCM has failed
 

Trouble Code: P0140



HO2S-12 (Bank 1 Sensor 2) Insufficient Activity

Possible Causes:



Exhaust leak present in the exhaust manifold or exhaust pipes
 
HO2S signal or ground circuit has a high resistance condition
 
HO2S element is silicon, water or fuel contaminated
 
PCM has failed
 

Trouble Code: P0141



HO2S-12 (Bank 1 Sensor 2) Heater Circuit Malfunction

Possible Causes:



HO2S heater ground circuit is open or has high resistance
 
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: P0143



HO2S-13 (Bank 1 Sensor 3) Circuit Low Input

Possible Causes:



Air leaks in the exhaust system, intake manifold, vacuum lines
 
Engine misfire condition present (look for P0300 series codes)
 
Fuel system too lean (possible low fuel pressure, water in fuel)
 
HO2S signal circuit is shorted to the sensor or chassis ground
 
HO2S is damaged (i.e., cracked) or air reference hole clogged
 
PCM has failed
 

Trouble Code: P0144



HO2S-13 (Bank 1 Sensor 3) Circuit High Input

Possible Causes:



Fuel system is too rich (fuel pressure too high, fuel pressure regulator leaking, or one or more fuel injectors sticking/leaking)
 
HO2S element is silicon, water or fuel contaminated
 
HO2S signal moisture tracking in the connector to signal circuit
 
PCM has failed
 

Trouble Code: P0146



HO2S-13 (Bank 1 Sensor 3) Insufficient Activity

Possible Causes:



HO2S heater is damaged or has failed
 
HO2S signal or ground circuit has a high resistance condition
 
HO2S signal circuit is open or shorted to system power (B+)
 
HO2S has failed (i.e., it is silicon, water or fuel contaminated)
 
PCM has failed
 

Trouble Code: P0147



HO2S-13 (Bank 1 Sensor 3) Heater Circuit

Possible Causes:



HO2S heater ground circuit is open, or HO2S heater power circuit is open (O2S fuse)
 
HO2S heater element is damaged or has failed
 
PCM has failed
 

Trouble Code: P0150



HO2S-21 (Bank 2 Sensor 1) Closed Loop Performance

Possible Causes:



Air leaks in the exhaust system, intake manifold, vacuum lines
 
EVAP Purge system malfunction or charcoal canister problems
 
HO2S signal circuit is open between the sensor and the PCM
 
HO2S signal circuit is shorted to sensor or chassis ground
 
HO2S is damaged, contaminated or air reference hole clogged
 
PCM has failed
 

Trouble Code: P0151



HO2S-21 (Bank 2 Sensor 1) Circuit Low Input

Possible Causes:



Air leaks in the exhaust system, intake manifold, vacuum lines
 
Engine misfire condition present (look for P0300 series codes)
 
Fuel system too lean (possible low fuel pressure, water in fuel)
 
HO2S signal circuit is shorted to the sensor or chassis ground
 
HO2S is damaged (i.e., cracked) or air reference hole clogged
 
PCM has failed
 

Trouble Code: P0152



HO2S-21 (Bank 2 Sensor 1) Circuit High Input

Possible Causes:



Fuel system is too rich (fuel pressure too high, fuel pressure regulator leaking, or one or more fuel injectors sticking/leaking)
 
HO2S element is silicon, water or fuel contaminated
 
HO2S signal circuit is shorted to system power (B+)
 
HO2S signal tracking (water intrusion) in the connector causing a short between the HO2S signal and heater power circuits
 
PCM has failed
 

Trouble Code: P0153



HO2S-21 (Bank 2 Sensor 1) Slow Response

Possible Causes:



Exhaust leak present in the exhaust manifold or exhaust pipes
 
Fuel system rich (high fuel pressure, fuel pressure regulator leaking, or leaking injectors)
 
HO2S element is silicon, water or fuel contaminated or it failed
 
TP sensor element broken (can cause false acceleration event)
 
PCM has failed
 

Trouble Code: P0154



HO2S-21 (Bank 2 Sensor 1) Insufficient Activity

Possible Causes:



HO2S heater is damaged or has failed
 
HO2S signal or ground circuit has a high resistance condition
 
HO2S signal circuit is open or shorted to system power (B+)
 
HO2S has failed (i.e., it is silicon, water or fuel contaminated)
 
PCM has failed
 

 
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