Check engine light on: Codes, Causes & Fixes

P0420 Powertrain The bank 1 catalytic converter no longer stores enough oxygen to clean the exhaust properly. Low 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

C0561 Chassis GM's brake or chassis module switched off stability/traction control because of a fault… Low C1130 Nissan · Chassis The ABS/VDC unit isn't getting a valid engine signal from the ECM, so it switches stability… Moderate C1201 Toyota · Chassis The engine computer reported a fault, so the ABS/VSC unit switched stability and traction… Low C121C Jeep · Chassis The ESC module asked the engine to cut power and the PCM refused, so stability and traction… Low C1611 Hyundai · Chassis The ABS/ESC module stopped hearing from the engine computer on the CAN bus and shut off… Moderate P0000 Powertrain P0000 is not a fault: the scanner found no stored code. It is a placeholder that means… Minor 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