For mechanics

What does this fault code mean?

100 common OBD2 fault codes: what they mean, likely causes, parts involved and what to test first.

C0035

Left front wheel speed sensor circuit

C0040

Right front wheel speed sensor circuit

C0045

Left rear wheel speed sensor circuit

C0050

Right rear wheel speed sensor circuit

P0010

A camshaft position actuator circuit, bank 1

P0011

A camshaft position timing over-advanced or system performance, bank 1

P0014

B camshaft position timing over-advanced or system performance, bank 1

P0016

Crankshaft and camshaft position correlation, bank 1 sensor A

P0087

Fuel rail or system pressure too low

P0088

Fuel rail or system pressure too high

P0100

Mass air flow circuit

P0101

Mass air flow circuit range or performance

P0102

Mass air flow circuit low input

P0103

Mass air flow circuit high input

P0106

Manifold absolute pressure or barometric pressure circuit range or performance

P0107

Manifold absolute pressure or barometric pressure circuit low input

P0108

Manifold absolute pressure or barometric pressure circuit high input

P0112

Intake air temperature sensor circuit low input

P0113

Intake air temperature sensor circuit high input

P0115

Engine coolant temperature circuit

P0116

Engine coolant temperature circuit range or performance

P0117

Engine coolant temperature circuit low input

P0118

Engine coolant temperature circuit high input

P0121

Throttle or pedal position sensor A circuit range or performance

P0122

Throttle or pedal position sensor A circuit low

P0123

Throttle or pedal position sensor A circuit high

P0125

Insufficient coolant temperature for closed loop fuel control

P0128

Coolant thermostat, coolant temperature below regulating temperature

P0131

O2 sensor circuit low voltage, bank 1 sensor 1

P0133

O2 sensor circuit slow response, bank 1 sensor 1

P0134

O2 sensor circuit no activity detected, bank 1 sensor 1

P0135

O2 sensor heater circuit, bank 1 sensor 1

P0138

O2 sensor circuit high voltage, bank 1 sensor 2

P0141

O2 sensor heater circuit, bank 1 sensor 2

P0155

O2 sensor heater circuit, bank 2 sensor 1

P0171

System too lean, bank 1

P0172

System too rich, bank 1

P0174

System too lean, bank 2

P0175

System too rich, bank 2

P0191

Fuel rail pressure sensor A circuit range or performance

P0201

Injector circuit or open, cylinder 1

P0217

Engine coolant overtemperature condition

P0230

Fuel pump primary circuit

P0234

Turbocharger or supercharger A overboost condition

P0299

Turbocharger or supercharger A underboost condition

P0300

Random or multiple cylinder misfire detected

P0301

Cylinder 1 misfire detected

P0302

Cylinder 2 misfire detected

P0303

Cylinder 3 misfire detected

P0304

Cylinder 4 misfire detected

P0305

Cylinder 5 misfire detected

P0306

Cylinder 6 misfire detected

P0307

Cylinder 7 misfire detected

P0308

Cylinder 8 misfire detected

P0325

Knock sensor 1 circuit, bank 1 or single sensor

P0327

Knock sensor 1 circuit low, bank 1 or single sensor

P0328

Knock sensor 1 circuit high, bank 1 or single sensor

P0335

Crankshaft position sensor A circuit

P0336

Crankshaft position sensor A circuit range or performance

P0340

Camshaft position sensor A circuit, bank 1 or single sensor

P0341

Camshaft position sensor A circuit range or performance, bank 1 or single sensor

P0351

Ignition coil A primary or secondary circuit

P0401

Exhaust gas recirculation flow insufficient detected

P0402

Exhaust gas recirculation flow excessive detected

P0403

Exhaust gas recirculation control circuit

P0410

Secondary air injection system

P0420

Catalyst system efficiency below threshold, bank 1

P0430

Catalyst system efficiency below threshold, bank 2

P0440

Evaporative emission system malfunction

P0441

Evaporative emission system incorrect purge flow

P0442

Evaporative emission system leak detected, small leak

P0443

Evaporative emission system purge control valve circuit

P0446

Evaporative emission system vent control circuit

P0455

Evaporative emission system leak detected, large leak

P0456

Evaporative emission system leak detected, very small leak

P0457

Evaporative emission system leak detected, fuel cap loose or off

P0480

Fan 1 control circuit

P0500

Vehicle speed sensor A

P0505

Idle air control system

P0506

Idle control system RPM lower than expected

P0507

Idle control system RPM higher than expected

P0520

Engine oil pressure sensor or switch circuit

P0562

System voltage low

P0563

System voltage high

P0606

Control module processor

P0700

Transmission control system malfunction

P0705

Transmission range sensor A circuit

P0715

Input or turbine speed sensor A circuit

P0720

Output speed sensor circuit

P0730

Incorrect gear ratio

P0740

Torque converter clutch circuit or open

P0741

Torque converter clutch circuit performance or stuck off

P0750

Shift solenoid A

P2101

Throttle actuator control motor circuit range or performance

P2135

Throttle or pedal position sensor A/B voltage correlation

U0100

Lost communication with ECM or PCM A

U0101

Lost communication with TCM

U0121

Lost communication with anti-lock brake system control module

U0140

Lost communication with body control module

U0155

Lost communication with instrument panel cluster control module