Trouble Code: P0010
Variable Cam Timing Solenoid 'A' Circuit Malfunction
Possible Causes:
VCT 'A' solenoid connector is damaged, loose or shorted
VCT 'A' solenoid control circuit is open, shorted to ground or shorted to power
VCT 'A' solenoid is damaged or the PCM has failed
Trouble Code: P0011
Variable Cam Timing Over Advanced (Bank 1)
Possible Causes:
Camshaft timing improperly set, or continuous oil flow to the VCT piston chamber
Camshaft advance mechanism (the VCT unit) is sticking or binding mechanically
VCT solenoid valve is stuck in open position
Trouble Code: P0012
Variable Cam Timing Over Retarded (Bank 1)
Possible Causes:
Camshaft timing improperly set, or continuous oil flow to the VCT piston chamber
Camshaft advance mechanism (the VCT unit) is sticking or binding mechanically
VCT solenoid valve is stuck in open position
Trouble Code: P0020
Variable Cam Timing Solenoid 'B' Circuit Malfunction
Possible Causes:
VCT 'B' solenoid connector is damaged, loose or shorted
VCT 'B' solenoid control circuit is open, shorted to ground or shorted to power
VCT 'B' solenoid is damaged or the PCM has failed
Trouble Code: P0021
Variable Cam Timing Over Advanced (Bank 2)
Possible Causes:
Camshaft timing improperly set, or continuous oil flow to the VCT piston chamber
Camshaft advance mechanism (the VCT unit) is sticking or binding mechanically
VCT solenoid valve is stuck in open position
Trouble Code: P0022
Variable Cam Timing Over Retarded (Bank 2)
Possible Causes:
Camshaft timing improperly set, or continuous oil flow to the VCT piston chamber
Camshaft advance mechanism (the VCT unit) is sticking or binding mechanically
VCT solenoid valve is stuck in open position
Trouble Code: P0102
MAF Sensor Circuit Low Input
Possible Causes:
Check for leaks at air outlet tube
Sensor power circuit open, sensor ground circuit open
Sensor signal circuit open (may be disconnected)
Check for loose tube clamps near the MAF sensor
Trouble Code: P0103
MAF Sensor Circuit High Input
Possible Causes:
Check for a restricted inlet screen on the MAF sensor.
MAF sensor signal circuit is shorted to system power (B+)
MAF sensor is damaged or the PCM has failed
Trouble Code: P0106
Barometric Pressure Sensor Circuit Performance
Possible Causes:
Sensor has deteriorated (response time too slow) or has failed
PCM has failed
Trouble Code: P0107
Barometric Pressure Sensor Circuit Low Input
Possible Causes:
BARO sensor signal circuit is shorted to ground
BARO sensor VREF circuit (5v) is open
BARO sensor is damaged or it has failed
PCM has failed
Trouble Code: P0108
Barometric Sensor Circuit High Input
Possible Causes:
BARO sensor connector is damaged, open or shorted
BARO sensor signal circuit is open or shorted to VREF (5v)
BARO sensor is damaged or it has failed
PCM has failed
Trouble Code: P0109
Barometric Sensor Circuit Intermittent Input
Possible Causes:
BARO sensor signal circuit is open or shorted to ground (intermittent)
BARO sensor VREF circuit (5v) is open
BARO sensor signal circuit is shorted to ground (Intermittent)
BARO sensor is damaged or it has failed
Trouble Code: P0112
Intake Air Temperature Sensor Circuit Low Input
Possible Causes:
IAT sensor signal circuit is grounded (check wiring & connector)
IAT sensor is damaged or it has failed
PCM has failed
Trouble Code: P0113
Intake Air Temperature Sensor Circuit High Input
Possible Causes:
IAT sensor signal circuit is open (inspect wiring & connector)
IAT sensor signal circuit is shorted to VREF (5v)
IAT sensor is damaged or it has failed
PCM has failed
Trouble Code: P0116
ECT Sensor / CHT Sensor Signal Range/Performance
Possible Causes:
Check for low coolant level or incorrect coolant mixture
CHT sensor is out-of-calibration or it has failed
ECT sensor is out-of-calibration or it has failed
Trouble Code: P0117
ECT Sensor Circuit Low Input
Possible Causes:
ECT sensor signal circuit is grounded in the wiring harness
ECT sensor is damaged or the PCM has failed
Trouble Code: P0118
ECT Sensor Circuit High Input
Possible Causes:
ECT sensor signal circuit is open (inspect wiring & connector)
ECT sensor signal circuit is shorted to VREF (5v)
ECT sensor is damaged or it has failed
PCM has failed
Trouble Code: P0121
TP Sensor Signal Range/Performance
Possible Causes:
Throttle plate is binding, dirty or sticking
TP sensor signal circuit open (inspect wiring & connector)
TP sensor ground circuit open (inspect wiring & connector)
TP Sensor is damaged or has failed
Trouble Code: P0122
TP Sensor Circuit Low Input
Possible Causes:
TP sensor signal circuit open (inspect wiring & connector)
TP sensor signal shorted to ground (inspect wiring & connector)
TP sensor VREF circuit is open (between the sensor and PCM)
TP sensor is damaged or has failed
PCM has failed
Trouble Code: P0123
TP Sensor Circuit High Input
Possible Causes:
TP sensor not seated correctly in housing (may be damaged)
TP sensor signal is circuit shorted to VREF or system voltage
TP sensor ground circuit is open (check the wiring harness)
Perform a "sensor sweep test" and monitor for any glitches
PCM has failed
Trouble Code: P0125
Insufficient Coolant Temperature For Closed Loop
Possible Causes:
Check the coolant mixture for an incorrect mixture
Check the operation of the thermostat (it may be stuck open)
ECT sensor (or the CHT sensor) has failed
Inspect for low coolant level
Trouble Code: P0128
Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
Possible Causes:
Insufficient warm-up time
Low engine coolant level
Leaking or stuck open thermostat
Inoperative engine coolant temperature sensor
Inoperative cylinder head temperature sensor
Trouble Code: P0131
HO2S-11 (Bank 1 Sensor 1) Circuit Low Input
Possible Causes:
HO2S is contaminated (due to presence of silicone in fuel)
HO2S signal and ground circuit wires crossed in wiring harness
HO2S signal circuit is shorted to sensor or chassis ground
HO2S element has failed (internal short condition)
PCM has failed
Trouble Code: P0132
HO2S-11 (Bank 1 Sensor 1) Circuit High Input
Possible Causes:
HO2S signal shorted to heater power circuit inside connector
HO2S signal circuit shorted to VREF or to system voltage
PCM has failed
Trouble Code: P0133
HO2S-11 (Bank 1 Sensor 1) Circuit Slow Response
Possible Causes:
HO2S is contaminated (due to presence of silicone in fuel)
HO2S signal circuit open
Leaks present in the exhaust manifold or exhaust pipes
HO2S is damaged or has failed
PCM has failed
Trouble Code: P0135
HO2S-11 (Bank 1 Sensor 1) Heater Circuit Malfunction
Possible Causes:
HO2S heater power circuit is open or heater ground circuit open
HO2S signal tracking (due to oil or moisture in the connector)
HO2S is damaged or has failed
PCM has failed
Trouble Code: P0136
HO2S-12 (Bank 1 Sensor 1) Circuit No Activity
Possible Causes:
Leaks present in the exhaust manifold or exhaust pipes
HO2S signal wire and ground wire crossed in connector
HO2S element is fuel contaminated or has failed
PCM has failed
Trouble Code: P0138
HO2S-12 (Bank 1 Sensor 2) Circuit High Input
Possible Causes:
HO2S signal shorted to heater power circuit in the connector
HO2S signal circuit shorted to VREF or to system voltage
PCM has failed
Trouble Code: P0141
HO2S-12 (Bank 1 Sensor 2) Heater Circuit Malfunction
Possible Causes:
HO2S heater power circuit is open or heater ground circuit open
HO2S signal tracking (due to oil or moisture in the connector)
HO2S is damaged or has failed
PCM has failed
Trouble Code: P0148
Fuel Delivery Error
Possible Causes:
Severely restricted fuel filter
Severely pinched or restricted fuel delivery line
Trouble Code: P0151
HO2S-21 (Bank 2 Sensor 1) Circuit Low Input
Possible Causes:
HO2S connector is damaged or shorted
HO2S signal and ground circuit wires crossed in wiring harness
HO2S signal circuit is shorted to sensor or chassis ground
HO2S element has failed (internal short condition)
PCM has failed
Trouble Code: P0152
HO2S-21 (Bank 2 Sensor 1) Circuit High Input
Possible Causes:
HO2S is contaminated (due to presence of silicone in fuel)
HO2S signal tracking (due to oil or moisture in the connector)
HO2S signal circuit is open or shorted to VREF
PCM has failed
Trouble Code: P0153
HO2S-21 (Bank 2 Sensor 1) Circuit Slow Response
Possible Causes:
HO2S is contaminated (due to presence of silicone in fuel)
Leaks present in the exhaust manifold or exhaust pipes
HO2S is damaged or has failed
PCM has failed
Trouble Code: P0155
HO2S-21 (Bank 2 Sensor 1) Heater Circuit Malfunction
Possible Causes:
HO2S heater power circuit is open
HO2S heater ground circuit is open
HO2S signal tracking (due to oil or moisture in the connector)
HO2S is damaged or has failed
PCM has failed
Trouble Code: P0156
HO2S-22 (Bank 2 Sensor 2) Circuit No Activity
Possible Causes:
Leaks present in the exhaust manifold or exhaust pipes
HO2S signal wire and ground wire crossed in connector
HO2S element is fuel contaminated or has failed
PCM has failed
Trouble Code: P0158
HO2S-22 (Bank 2 Sensor 2) Circuit High Input
Possible Causes:
HO2S signal shorted to the heater power circuit (due to oil or moisture in the connector)
HO2S signal circuit shorted to VREF or to system voltage
PCM has failed
Trouble Code: P0161
HO2S-22 (Bank 2 Sensor 2) Heater Circuit Malfunction
Possible Causes:
HO2S heater power circuit or the heater ground circuit is open
HO2S signal tracking (due to oil or moisture in the connector)
HO2S has failed, or the PCM has failed
Trouble Code: P0171
Fuel System Too Lean (Cylinder Bank 1)
Possible Causes:
Air leaks after the MAF sensor, or leaks in the PCV system
Exhaust leaks before or near where the HO2S is mounted
Fuel injector(s) restricted or not supplying enough fuel
Fuel pump not supplying enough fuel during high fuel demand conditions
Leaking EGR gasket, or leaking EGR valve diaphragm
MAF sensor dirty (causes PCM to underestimate airflow)
Vehicle running out of fuel or engine oil dip stick not seated
TSB 01-20-5 contains a repair procedure for this trouble code
Trouble Code: P0172
Fuel System Too Rich (Cylinder Bank 1)
Possible Causes:
Camshaft timing is incorrect, or the engine has an oil overfill condition
EVAP vapor recovery system failure (may be pulling vacuum)
Fuel pressure regulator is damaged or leaking
HO2S element is contaminated with alcohol or water
MAF or MAP sensor values are incorrect or out-of-range
One of more fuel injectors is leaking
Trouble Code: P0174
Fuel System Too Lean (Cylinder Bank 2)
Possible Causes:
Air leaks after the MAF sensor, or leaks in the PCV system
Exhaust leaks before or near where the HO2S is mounted
Fuel injector(s) restricted or not supplying enough fuel
Fuel system not supplying enough fuel during high fuel demand conditions (e.g., the fuel pump may not supply enough fuel)
Leaking EGR gasket, or leaking EGR valve diaphragm
MAF sensor dirty (causes PCM to underestimate airflow)
Vehicle running out of fuel or engine oil dip stick not seated
TSB 1-20-5 contains a repair procedure for this trouble code
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