Trouble Code: P0100
Mass or Volume Airflow Sensor Circuit Malfunction
Possible Causes:
MAF sensor signal circuit is shorted to ground
MAF sensor signal circuit is shorted to VREF or system power
MAF sensor ground circuit is open between sensor and ground
MAF sensor is damaged or has failed
PCM has failed
Trouble Code: P0101
Mass Airflow or Volume Airflow Sensor Performance
Possible Causes:
MAF sensor signal circuit is shorted to ground
MAF sensor signal circuit is shorted to VREF or system power
MAF sensor ground circuit is open between sensor and ground
MAF sensor is contaminated (dirty), damaged or has failed
PCM has failed
Trouble Code: P0102
Mass or Volume Airflow Sensor Circuit Low Input
Possible Causes:
MAF sensor signal circuit is open or shorted to ground
MAF sensor power (VREF) circuit is open or shorted to ground
MAF sensor is damaged or has failed
PCM has failed
Trouble Code: P0103
Volume Airflow Sensor Circuit High Input
Possible Causes:
MAF sensor signal circuit is open between the sensor and PCM
MAF sensor signal circuit is shorted to VREF or system power
MAF sensor ground circuit is open between sensor and ground
MAF sensor is damaged or has failed
PCM has failed
Trouble Code: P0110
Intake Air Temperature Sensor Circuit Malfunction
Possible Causes:
IAT sensor signal circuit is open or shorted to ground
IAT sensor ground circuit is open between sensor and the PCM
IAT sensor signal circuit is shorted to VREF or system power
IAT sensor is damaged or has failed
PCM has failed
Trouble Code: P0112
Intake Air Temperature Sensor Circuit High Input
Possible Causes:
IAT sensor signal circuit is open between sensor and the PCM
IAT sensor ground circuit is open between sensor and the PCM
IAT sensor signal circuit is shorted to VREF or system power
IAT sensor is damaged or has failed
PCM has failed
Trouble Code: P0113
Intake Air Temperature Sensor Circuit Low Input
Possible Causes:
IAT sensor signal circuit is shorted to ground
IAT sensor is damaged or has failed
PCM has failed
Trouble Code: P0115
Engine Coolant Temperature Sensor Circuit Malfunction
Possible Causes:
ECT sensor signal circuit is open or shorted ground
ECT sensor ground circuit is open between sensor and PCM
ECT sensor signal circuit is shorted to VREF or system power
ECT sensor is damaged or has failed
PCM has failed
Trouble Code: P0116
Engine Coolant Temperature Sensor Performance
Possible Causes:
ECT sensor circuit is open or shorted ground (intermittent fault)
ECT sensor ground circuit is open (an intermittent fault)
ECT sensor has drifted out of calibration or has failed
PCM has failed
Trouble Code: P0117
Engine Coolant Temperature Sensor Low Input
Possible Causes:
ECT sensor signal circuit is shorted to ground
ECT sensor is damaged or has failed
PCM has failed
Trouble Code: P0118
Engine Coolant Temperature Sensor High Input
Possible Causes:
ECT sensor signal circuit is open between sensor and the PCM
ECT sensor ground circuit is open between sensor and PCM
ECT sensor signal circuit is shorted to VREF or system power
ECT sensor is damaged or has failed
PCM has failed
Trouble Code: P0119
Engine Coolant Temperature Sensor Circuit Malfunction
Possible Causes:
ECT sensor signal circuit is open (an intermittent fault)
ECT sensor ground circuit is open (an intermittent fault)
ECT sensor signal circuit is shorted to VREF (intermittent fault)
ECT sensor is damaged or has failed (an intermittent fault)
PCM has failed
Trouble Code: P0120
Throttle Position Sensor Circuit Malfunction
Possible Causes:
TP sensor signal circuit is open or shorted to ground
TP sensor ground circuit or power (VREF) circuit is open
TP sensor is damaged or has failed
PCM has failed
Trouble Code: P0121
Throttle Position Sensor Range/Performance
Possible Causes:
TP sensor signal circuit open or shorted to ground (intermittent)
TP sensor is loose at it mounting or the throttle is binding
Throttle body or linkage is binding or sticking
TP sensor is damaged or has failed (perform a sweep test)
PCM has failed
Trouble Code: P0122
Throttle Position Sensor Circuit Low Input
Possible Causes:
TP sensor signal circuit is shorted to ground
TP sensor power circuit is open
TP sensor is damaged or has failed (perform a sweep test)
PCM has failed
Trouble Code: P0123
Throttle Position Sensor Circuit High Input
Possible Causes:
TP sensor signal circuit is open or shorted to VREF
TP sensor ground circuit is open between sensor and the PCM
TP sensor is damaged or has failed (perform a sweep test)
PCM has failed
Trouble Code: P0125
Excessive Time To Enter Closed Loop
Possible Causes:
Check the operation of the thermostat (it may be stuck open)
ECT sensor has failed
Inspect for low coolant level or an incorrect coolant mixture
Trouble Code: P0128
Thermostat Malfunction Detected
Possible Causes:
Check the operation of the thermostat (it may be stuck open)
ECT sensor is out-of-calibration or skewed
Inspect for low coolant level or for an incorrect coolant mixture
TSB 01-36-008 (5/01) contains information about this code
Trouble Code: P0130
HO2S-11 (Bank 1 Sensor 1) Circuit Malfunction
Possible Causes:
HO2S signal circuit is open between the sensor and the PCM
HO2S signal circuit is shorted to sensor or chassis ground
HO2S signal circuit is shorted to VREF or system power (B+)
HO2S is damaged, contaminated or it has failed
PCM has failed
Trouble Code: P0131
HO2S-11 (Bank 1 Sensor 1) Circuit Low Input
Possible Causes:
Low fuel pressure, fuel filter restricted or fuel injectors plugged
HO2S signal circuit is shorted to ground (an intermittent fault)
HO2S may be contaminated or it has failed
HO2S heater is damaged or has failed
PCM has failed
Trouble Code: P0132
HO2S-11 (Bank 1 Sensor 1) Circuit High Input
Possible Causes:
Fuel pressure regulator leaking or fuel injectors leaking
HO2S signal circuit is shorted to the heater power circuit
HO2S may be contaminated or it has failed
HO2S heater is damaged or has failed
PCM has failed
Trouble Code: P0133
HO2S-11 (Bank 1 Sensor 1) Slow Response
Possible Causes:
HO2S signal circuit is open or shorted to ground
HO2S element is contaminated or it has failed
HO2S heater is damaged or has failed
Intake air leaks, exhaust manifold leaks or PCV system leaks
MAF sensor out of calibration (it may be dirty or contaminated)
Trouble Code: P0134
HO2S-11 (Bank 1 Sensor 1) No Activity Detected
Possible Causes:
HO2S signal circuit is open or shorted to ground
HO2S element is contaminated or it has failed
HO2S heater is damaged or has failed
PCM has failed
Trouble Code: P0135
HO2S-11 (Bank 1 Sensor 1) Heater Circuit Malfunction
Possible Causes:
HO2S heater control circuit is open or shorted to ground
HO2S heater control circuit is shorted to power
HO2S heater power circuit is open (check fuse in Engine J/B)
HO2S heater is damaged or has failed
PCM has failed
Trouble Code: P0136
HO2S-12 (Bank 1 Sensor 2) Circuit Malfunction
Possible Causes:
HO2S signal circuit is open between the sensor and the PCM
HO2S signal circuit is shorted to sensor or chassis ground
HO2S signal circuit is shorted to VREF or system power (B+)
HO2S is damaged, contaminated or it has failed
PCM has failed
Trouble Code: P0137
HO2S-12 (Bank 1 Sensor 2) Circuit Low Input
Possible Causes:
Low fuel pressure, fuel filter restricted or fuel injectors plugged
HO2S signal circuit is shorted to ground (an intermittent fault)
HO2S may be contaminated or it has failed
HO2S heater is damaged or has failed
PCM has failed
Trouble Code: P0138
HO2S-12 (Bank 1 Sensor 2) Circuit High Input
Possible Causes:
Fuel pressure regulator leaking or fuel injectors leaking
HO2S signal circuit is shorted to the heater power circuit
HO2S may be contaminated or it has failed
HO2S heater is damaged or has failed
PCM has failed
Trouble Code: P0139
HO2S-12 (Bank 1 Sensor 2) Slow Response
Possible Causes:
HO2S signal circuit is open or shorted to ground
HO2S element is contaminated or it has failed
HO2S heater is damaged or has failed
Intake air leaks, exhaust manifold leaks or PCV system leaks
MAF sensor out of calibration (it may be dirty or contaminated)
Trouble Code: P0140
HO2S-12 (Bank 1 Sensor 2) Circuit No Activity
Possible Causes:
HO2S signal circuit is open or shorted to ground
HO2S element is contaminated, damaged or has failed
PCM has failed
Trouble Code: P0141
HO2S-12 (Bank 1 Sensor 2) Heater Circuit Malfunction
Possible Causes:
HO2S heater control circuit shorted to ground or system power
HO2S heater power circuit is open (check fuse in Engine J/B)
HO2S heater is damaged or has failed
PCM has failed
Trouble Code: P0171
Fuel System Too Lean (Bank 1)
Possible Causes:
Air leaks after the MAF sensor, or in the EGR or PCV system
Base engine "mechanical" fault affecting one or more cylinders
Exhaust leaks located in front of the A/FS or HO2S location
Fuel control sensor is out of calibration (i.e., ECT, IAT or MAP)
Fuel delivery system supplying too little fuel during cruise or idle periods (e.g., faulty fuel pump or dirty, restricted fuel filter)
Fuel injector (one or more) dirty or pressure regulator has failed
HO2S is contaminated, deteriorated or it has failed
Vehicle driven low on fuel or until it ran out of fuel
Trouble Code: P0172
Fuel System Too Rich (Bank 1)
Possible Causes:
Base engine "mechanical" fault affecting one or more cylinders
EVAP system component has failed or canister fuel saturated
Exhaust leaks located in front of the HO2S location
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 Circuit Malfunction
Possible Causes:
Injector 1 control circuit open or grounded
Injector 1 control circuit shorted to system power
Injector 1 power (B+) circuit open
Injector 1 damaged or has failed
PCM has failed
Trouble Code: P0202
Fuel Injector 2 Circuit Malfunction
Possible Causes:
Injector 2 control circuit open or grounded
Injector 2 control circuit shorted to system power
Injector 2 power (B+) circuit open
Injector 2 damaged or has failed
PCM has failed
Trouble Code: P0203
Fuel Injector 3 Circuit Malfunction
Possible Causes:
Injector 3 control circuit open or grounded
Injector 3 control circuit shorted to system power
Injector 3 power (B+) circuit open
Injector 3 damaged or has failed
PCM has failed
Trouble Code: P0204
Fuel Injector 4 Circuit Malfunction
Possible Causes:
Injector 4 control circuit open or grounded
Injector 4 control circuit shorted to system power
Injector 4 power (B+) circuit open
Injector 4 damaged or has failed
PCM has failed
Trouble Code: P0230
Fuel Pump Circuit Malfunction
Possible Causes:
Fuel pump control circuit is open or shorted to ground
Fuel pump relay power circuit from ignition switch is open
Fuel pump relay is damaged or has failed
PCM has failed
Trouble Code: P0300
Multiple Misfire Detected
Possible Causes:
Ignition system or fuel metering fault in 2 or more cylinders
Fuel pressure too low or too high, fuel supply contaminated
CKP/CMP signals, EVAP canister saturated, EGR valve stuck
Trouble Code: P0301
Cylinder 1 Misfire Detected
Possible Causes:
Base engine mechanical fault that affects only one cylinder
Fuel metering fault that affects only one cylinder
EGR valve is stuck open or the PCV system has a vacuum leak
Ignition system fault (i.e., a coil) that affects only one cylinder
Trouble Code: P0302
Cylinder 2 Misfire Detected
Possible Causes:
Base engine mechanical fault that affects only one cylinder
Fuel metering fault that affects only one cylinder
EGR valve is stuck open or the PCV system has a vacuum leak
Ignition system fault (i.e., a coil) that affects only one cylinder
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