Fuel & Air Metering Trouble Codes: List & Fixes

P0174 Powertrain The cylinder bank without cylinder 1 is running lean even with the maximum fuel correction… Moderate P0101 Powertrain The MAF sensor's airflow reading doesn't match what the engine computer expects… Low P0113 Powertrain The intake air temperature signal is stuck at maximum voltage, which usually means an open… Low P0135 Powertrain The heater inside the upstream oxygen sensor on bank 1 isn't working or its circuit is faulty. Low P0171 Powertrain The engine computer is adding the maximum extra fuel it's allowed on bank 1 and still sees… Moderate P0172 Powertrain The engine computer is pulling as much fuel as it's allowed on bank 1 and the mixture is still… Moderate

P0001 Powertrain The PCM can't drive the solenoid that meters fuel into the high-pressure pump. Often a no-start… High P0008 Powertrain Camshaft timing on bank 1 has drifted from the crankshaft. Often a stretched timing chain. Moderate P0010 Powertrain The PCM found an electrical fault in the intake cam phaser solenoid circuit on bank 1, not… Low P0011 Powertrain The bank 1 intake cam sits further advanced than the PCM asked for, usually an oil or control… Moderate P0012 Powertrain The bank 1 intake cam lags behind the angle the PCM wants, often from chain stretch or weak oil… Moderate P0013 Powertrain Electrical fault in the bank 1 exhaust cam phaser solenoid circuit; the exhaust cam stays… Low P0014 Powertrain The bank 1 exhaust cam won't follow its target and stays too far advanced; think oil, valve… Moderate P0015 Powertrain The bank 1 exhaust cam sits later than commanded; a stretched chain or stuck exhaust phaser… Moderate P0016 Powertrain The bank 1 intake cam and the crankshaft are out of step, most often from a stretched or jumped… High P0017 Powertrain The bank 1 exhaust cam signal doesn't line up with the crankshaft; think chain, exhaust phaser… Moderate P0018 Powertrain The bank 2 intake cam is out of step with the crankshaft on a V or boxer engine; chain wear… High P0019 Powertrain The bank 2 exhaust cam signal doesn't match the crankshaft; chain, bank 2 exhaust phaser… Moderate P0020 Powertrain Electrical fault in the bank 2 intake cam solenoid circuit on a V or boxer engine; bank 2… Low P0021 Powertrain The bank 2 intake cam is more advanced than commanded or slow to respond; compare it with bank… Moderate P0022 Powertrain The bank 2 intake cam can't advance as far as the PCM asks; phaser, oil pressure or a worn bank… Moderate P0024 Powertrain The bank 2 exhaust cam stays too far advanced or reacts too slowly; check the valve, the oil… Moderate P0026 Powertrain The oil-operated valve control on the bank 1 intake side isn't responding as commanded. Check… Low P0028 Powertrain A bank 2 valve lift solenoid didn't produce the expected result; low or old oil is the most… Low P0030 Powertrain The engine computer found a fault in the heater circuit of the upstream air-fuel sensor on bank… Low P0031 Powertrain The upstream sensor heater on bank 1 draws little or no current – usually an open heater… Low P0032 Powertrain The bank 1 upstream heater circuit looks shorted to power or is drawing far too much current. Low P0036 Powertrain The heater circuit of the oxygen sensor behind the bank 1 catalytic converter is acting… Minor P0037 Powertrain No current flows through the heater of the sensor behind the bank 1 converter – open element… Minor P0038 Powertrain The heater circuit of the sensor behind the bank 1 converter shows a short to power or excess… Low P0045 Powertrain The engine computer sees an open or shorted circuit to the solenoid that controls turbo boost. Moderate P0046 Powertrain The boost control solenoid circuit is intact, but boost doesn't follow what the solenoid… Moderate P0050 Powertrain The heater circuit of the upstream sensor on bank 2 – the side without cylinder 1 – is out… Low P0051 Powertrain The bank 2 upstream sensor heater draws no current: open element, lost feed or broken wire. Low P0056 Powertrain The heater circuit of the sensor behind the bank 2 converter is erratic – typical… Minor P0057 Powertrain The heater behind the bank 2 converter draws no current – open element or cut, torn… Minor