Code lookup
What does your trouble code mean?
Start with the code the car reported. See its meaning, Car Assist’s first verdict and what to check next.
P0 engine and emissions
- P0045 — Turbocharger/Supercharger Boost Control A Circuit/Open
- P0046 — Turbocharger/Supercharger Boost Control A Circuit Range/Performance
- P0087 — Fuel Rail/System Pressure - Too Low Bank 1
- P0088 — Fuel Rail/System Pressure - Too High Bank 1
- P0093 — Fuel System Leak Detected - Large Leak
- P0101 — Mass or Volume Air Flow Sensor A Circuit Range/Performance
- P0102 — Mass or Volume Air Flow Sensor A Circuit Low
- P0113 — Intake Air Temperature Sensor 1 Circuit High Bank 1
- P0116 — Engine Coolant Temperature Sensor 1 Circuit Range/Performance
- P0117 — Engine Coolant Temperature Sensor 1 Circuit Low
- P0118 — Engine Coolant Temperature Sensor 1 Circuit High
- P0125 — Insufficient Coolant Temperature for Closed Loop Fuel Control
- P0128 — Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
- P0130 — O2 Sensor Circuit Bank 1 Sensor 1
- P0133 — O2 Sensor Circuit Slow Response Bank 1 Sensor 1
- P0135 — O2 Sensor Heater Circuit Bank 1 Sensor 1
- P0141 — O2 Sensor Heater Circuit Bank 1 Sensor 2
- P0171 — System Too Lean Bank 1
- P0172 — System Too Rich Bank 1
- P0174 — System Too Lean Bank 2
- P0175 — System Too Rich Bank 2
- P0201 — Cylinder 1 Injector A Circuit
- P0202 — Cylinder 2 Injector A Circuit
- P0203 — Cylinder 3 Injector A Circuit
- P0204 — Cylinder 4 Injector A Circuit
- P0234 — Turbocharger/Supercharger A Overboost Condition
- P0299 — Turbocharger/Supercharger A Underboost Condition
- P0300 — Random/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
- P0335 — Crankshaft Position Sensor A Circuit
- P0340 — Camshaft Position Sensor A Circuit Bank 1 or Single Sensor
- P0380 — Glow Plug/Heater Circuit A
- P0400 — EGR A Flow
- P0401 — EGR A Flow Insufficient Detected
- P0402 — EGR A Flow Excessive Detected
- P0403 — EGR A Control Circuit/Open
- P0404 — EGR A Control Circuit Range/Performance
- P0405 — EGR Sensor A Circuit Low
- P0406 — EGR Sensor A Circuit High
- P0420 — Catalyst System Efficiency Below Threshold Bank 1
- P0430 — Catalyst System Efficiency Below Threshold Bank 2
- P0440 — EVAP System
- P0442 — EVAP System Leak Detected (small leak)
- P0455 — EVAP System Leak Detected - Large Leak
- P0500 — Vehicle Speed Sensor A Circuit
- P0505 — Idle Control System
- P0562 — System Voltage Low
- P0563 — System Voltage High
- P0670 — Glow Plug Control Module 1 Control Circuit/Open
- P0671 — Cylinder 1 Glow Plug Circuit/Open
- P0672 — Cylinder 2 Glow Plug Circuit/Open
- P0673 — Cylinder 3 Glow Plug Circuit/Open
- P0674 — Cylinder 4 Glow Plug Circuit/Open
P07–P09 transmission
No pages for these codes yet. Car Assist reads them, and its first verdict for most of them is: “A transmission fault usually needs a check soon; avoid heavy loads until it is checked.”
Their exact meaning can depend on the make, and some can only be read from the car’s other modules, which not every car allows.
Other generic powertrain codes
- P2002 — Particulate Filter Efficiency Below Threshold Bank 1
- P2146 — Fuel Injector Group A Supply Voltage Circuit/Open
- P2263 — Turbocharger/Supercharger A Boost System Performance
- P242F — Particulate Filter Restriction - Ash Accumulation Bank 1
- P2452 — Particulate Filter Pressure Sensor A Circuit
- P2453 — Particulate Filter Pressure Sensor A Circuit Range/Performance
- P2454 — Particulate Filter Pressure Sensor A Circuit Low
- P2455 — Particulate Filter Pressure Sensor A Circuit High
- P2457 — EGR Cooler A Efficiency Below Threshold
- P2458 — Particulate Filter Regeneration Duration Bank 1
- P2459 — Particulate Filter Regeneration Frequency Bank 1
- P2463 — Particulate Filter Restriction - Soot Accumulation Bank 1
C chassis
No pages for these codes yet. Car Assist reads them, and its first verdict for most of them is: “A chassis fault usually needs gentle driving and a check before a long trip; stop when safe if the brake warning light is on or the brakes feel different.”
Their exact meaning can depend on the make, and some can only be read from the car’s other modules, which not every car allows.
B body
No pages for these codes yet. Car Assist reads them, and its first verdict for most of them is: “A body system fault usually needs a check soon because airbags or other safety equipment may be affected.”
Their exact meaning can depend on the make, and some can only be read from the car’s other modules, which not every car allows.
U network
No pages for these codes yet. Car Assist reads them, and its first verdict for most of them is: “A communication fault usually needs a check soon because a control unit may not be working properly.”
Their exact meaning can depend on the make, and some can only be read from the car’s other modules, which not every car allows.