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Browse codes by system

These guides are grouped by the system discussed on each page. Related codes can provide useful context, but do not necessarily have the same cause. Read the complete code list and the exact vehicle procedure before choosing the order of tests.

Automatic transmission control 1

P0700
Transmission Control System Malfunction (MIL Request)
A starting point: A specific sensor, solenoid or pressure DTC stored in the TCM

Auxiliary emission controls 1

P0401
Exhaust Gas Recirculation Flow Insufficient
A starting point: Carbon-blocked EGR passages

Cam/crank correlation and mechanical timing 1

P0016
Crankshaft/Camshaft Position Correlation (Bank 1, Sensor A)
A starting point: Oil condition or recent timing work

Camshaft position and engine synchronization sensing 1

P0340
Camshaft Position Sensor A Circuit (Bank 1 or Single Sensor)
A starting point: Failed camshaft position sensor

Cooling 1

P0128
Coolant Thermostat Below Regulating Temperature
A starting point: Thermostat stuck open

Downstream oxygen-sensor heater and catalyst monitoring 1

P0141
Oxygen Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)
A starting point: Open or failed heater inside Bank 1 Sensor 2

EVAP purge control and fuel-tank pressure monitoring 1

P0496
Evaporative Emission System High Purge Flow
A starting point: Purge valve leaking in its closed state

EVAP vapor flow and purge monitoring 1

P0441
Evaporative Emission System Incorrect Purge Flow
A starting point: Loose, damaged, restricted or misrouted purge hoses

EVAP vent electrical control and valve operation 1

P0449
Evaporative Emission System Vent Valve/Solenoid Circuit
A starting point: Damaged vent wiring or connector

EVAP ventilation and control 1

P0446
Evaporative Emission System Vent Control Circuit
A starting point: Damaged vent hoses, filters or connectors

Engine speed and position sensing 1

P0335
Crankshaft Position Sensor A Circuit Malfunction
A starting point: Failed crankshaft position sensor

Evaporative emissions 2

P0442
Evaporative Emission System Leak Detected (Small Leak)
A starting point: Fuel-cap seal hardened, cracked or contaminated
P0455
Evaporative Emission System Leak Detected (Large Leak)
A starting point: Fuel cap, capless inlet or filler-neck sealing fault

Evaporative emissions and fuel-vapor containment 1

P0456
Evaporative Emission System Leak Detected (Very Small Leak)
A starting point: Loose cap, damaged cap seal or capless filler seal

Exhaust / emissions 2

P0420
Catalyst System Efficiency Below Threshold (Bank 1)
A starting point: Catalytic converter genuinely worn out
P0430
Catalyst System Efficiency Below Threshold (Bank 2)
A starting point: Bank 2 catalytic converter genuinely degraded

Fuel and air metering 4

P0101
Mass or Volume Air Flow "A" Circuit Range/Performance Problem
A starting point: Contaminated mass-airflow sensing element
P0171
System Too Lean (Bank 1)
A starting point: Unmetered air leak — vacuum hose, intake boot or gasket
P0172
System Too Rich (Bank 1)
A starting point: Leaking or over-delivering fuel injector
P0174
System Too Lean (Bank 2)
A starting point: Intake or vacuum leak affecting bank two

Idle air and electronic throttle control 1

P0507
Idle Control System RPM Higher Than Expected
A starting point: Vacuum or intake leak bypassing the throttle

Ignition, fuel and compression 2

P0300
Random / Multiple Cylinder Misfire Detected
A starting point: Worn spark plugs, coils or leads
P0301
Cylinder 1 Misfire Detected
A starting point: Worn or fouled spark plug on cylinder one

Intake-air temperature sensing and engine airflow calculation 1

P0113
Intake Air Temperature Sensor 1 Circuit High Input
A starting point: Loose connector, pushed-out pin or spread terminal

Knock sensing and ignition-timing protection 1

P0325
Knock Sensor 1 Circuit (Bank 1 or Single Sensor)
A starting point: Chafed, open or shorted wiring and loose connector terminals

Oxygen sensor heater circuit 1

P0135
Oxygen Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
A starting point: Open or failed heater inside Bank 1 Sensor 1

Turbocharger or supercharger boost control 2

P0234
Turbocharger/Supercharger A Overboost Condition
A starting point: Sticking wastegate, bypass valve or variable turbo vanes
P0299
Turbocharger/Supercharger A Underboost Condition
A starting point: Split, loose or swollen charge-air hose or intercooler leak

Variable camshaft timing and actuator control 1

P0012
"A" Camshaft Position - Timing Over-Retarded (Bank 1)
A starting point: Incorrect oil level, specification or service condition

Variable valve timing 1

P0011
"A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)
A starting point: Low, dirty or incorrect-viscosity engine oil