3.4L V6 VIN E Auto
Trouble Code: P0030
HO2S-11 (Bank 1 Sensor 1) Heater Circuit Malfunction
Possible Causes:
HO2S low side control circuit is shorted to system power (B+)
HO2S low side control circuit driver is shorted inside the PCM
HO2S heater has failed (it may be shorted internally)
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 has a high resistance
MAF sensor is damaged or it 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 ignition wires, generator, solenoids or electric motors
PCM has failed
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 close to Generator or ignition wires
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: P0107
MAP Sensor Circuit Low Input
Possible Causes:
MAP sensor signal circuit shorted to sensor 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
This code can set due to a backfire or engine cranking too long
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
TSB 02-06-03-005 contains a repair procedure for this code
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
TSB 02-06-03-005 contains a repair procedure for this code
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 "skewed" high
IAT sensor is out of calibration or it is "skewed" high or low
TSB 01-06-04-052 contains a repair procedure for this code
Trouble Code: P0117
ECT Sensor Circuit Low Input
Possible Causes:
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
Trouble Code: P0121
TP Sensor Signal Range/Performance
Possible Causes:
TP sensor signal circuit is shorted to ground (intermittent fault)
TP sensor signal circuit is open (an intermittent fault)
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 sensor ground
TP sensor signal circuit is open
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 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
Trouble Code: P0125
Engine Coolant Temperature Insufficient For Closed Loop Operation
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: P0125
Excessive Time To Closed Loop Fuel Control
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)
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: P0130
HO2S-11 (Bank 1 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: 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 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: 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 it has high resistance
HO2S heater power circuit is open (test O2S fuse in fuse block)
HO2S heater element is damaged or it 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 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: 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 assembly connector is damaged, open or shorted
HO2S heater ground circuit is open or it 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: 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)
Fuel component fault (fuel filter, fuel injector, low fuel pressure)
HO2S element is contaminated, deteriorated or has failed
Trouble Code: P0172
Fuel Trim System Rich (Bank 1)
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 between injector and PCM
Injector 1 control circuit is grounded between injector and PCM
Injector 1 power circuit is open (test INJ fuse in fuse block)
Injector 1 is damaged or it has failed
PCM is damaged
Trouble Code: P0202
Fuel Injector 2 Control Circuit Malfunction
Possible Causes:
Injector 2 control circuit is open between injector and PCM
Injector 2 control circuit is grounded between injector and PCM
Injector 2 power circuit is open (test INJ fuse in fuse block)
Injector 2 is damaged or it has failed
PCM is damaged
Trouble Code: P0203
Fuel Injector 3 Control Circuit Malfunction
Possible Causes:
Injector 3 control circuit is open between injector and PCM
Injector 3 control circuit is grounded between injector and PCM
Injector 3 power circuit is open (test INJ fuse in fuse block)
Injector 3 is damaged or it has failed
PCM is damaged
Trouble Code: P0204
Fuel Injector 4 Control Circuit Malfunction
Possible Causes:
Injector 4 control circuit is open between injector and PCM
Injector 4 control circuit is grounded between injector and PCM
Injector 4 power circuit is open (test INJ fuse in fuse block)
Injector 4 is damaged or it has failed
PCM is damaged
Trouble Code: P0205
Fuel Injector 5 Control Circuit Malfunction
Possible Causes:
Injector 5 control circuit is open between injector and PCM
Injector 5 control circuit is grounded between injector and PCM
Injector 5 power circuit is open (test INJ fuse in fuse block)
Injector 5 is damaged or it has failed
PCM is damaged
Trouble Code: P0206
Fuel Injector 6 Control Circuit Malfunction
Possible Causes:
Injector 6 control circuit is open between injector and PCM
Injector 6 control circuit is grounded between injector and PCM
Injector 6 power circuit is open (test INJ fuse in fuse block)
Injector 6 is damaged or it has failed
PCM is damaged
Trouble Code: P0230
Fuel Pump Control Circuit Malfunction
Possible Causes:
Fuel pump relay power circuit is open (test B+ from at 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: P0300
Multiple Cylinder Misfire Detected
Possible Causes:
Base engine mechanical or fuel metering fault that affects one or more cylinders
EVAP system problem or the EVAP canister is fuel saturated
EGR valve is stuck open or the PCV system has a vacuum leak
IC control circuit is shorted to ground (an intermittent fault)
Ignition system fault (a coil) that affects more than one cylinder
MAF sensor contamination (it can cause a very lean condition)
TSB 99-06-04-005B contains a repair procedure for this code
TSB 03-06-04-030 contains a repair procedure for this code
Trouble Code: P0301
Cylinder 1 Misfire Detected
Possible Causes:
Air leak in the intake manifold, or in the EGR or PCV system
Base engine mechanical fault that affects only Cylinder 1
Fuel component fault that affects only Cylinder 1 (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:
Air leak in the intake manifold, or in the EGR or PCV system
Base engine mechanical fault that affects only Cylinder 2
Fuel component fault that affects only Cylinder 2 (i.e., a dirty or sticking fuel injector)
Ignition system problem (coil, plug) that affects only Cylinder 2
Trouble Code: P0303
Cylinder 3 Misfire Detected
Possible Causes:
Air leak in the intake manifold, or in the EGR or PCV system
Base engine mechanical fault that affects only Cylinder 3
Fuel component fault that affects only Cylinder 3 (i.e., a dirty or sticking fuel injector)
Ignition system problem (coil, plug) that affects only Cylinder 3
Back to Top
