OBD-II Trouble Codes: Meaning & Fixes

P0174 Powertrain The cylinder bank without cylinder 1 is running lean even with the maximum fuel correction… Moderate P0420 Powertrain The bank 1 catalytic converter no longer stores enough oxygen to clean the exhaust properly. Low B0001 Body The airbag module found a fault in the firing circuit for the driver's front airbag (stage 1). High C0035 Chassis The ABS module lost a valid signal from the driver-side front wheel speed sensor. 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

P1381 Chevrolet · Powertrain A misfire was detected while the PCM had lost contact with the ABS module that supplies… Moderate P1391 Jeep · Powertrain The PCM keeps briefly losing the cam or crank position signal, which can make your Jeep stumble… Moderate P1399 Honda · Powertrain An older Honda's PCM counted misfires that jump between cylinders instead of staying in one. Moderate P1400 Ford · Powertrain The Ford PCM sees the EGR pressure-feedback (DPFE) sensor signal stuck below its normal minimum… Low P1401 Ford · Powertrain The Ford DPFE sensor that measures EGR flow is sending a voltage above anything it should… Low P1404 Chevrolet · Powertrain The electric EGR valve on a Chevy isn't fully closing when the PCM commands it shut. Low P1405 Ford · Powertrain Ford's EGR flow sensor isn't getting exhaust pressure on its upstream port: loose, split… Low P1406 Ford · Powertrain The hose between Ford's DPFE sensor and the EGR-valve side of the orifice is off, leaking… Low P1441 Chevrolet · Powertrain Engine vacuum is reaching the fuel tank even though the PCM has the EVAP purge valve turned off. Low P1444 Nissan · Powertrain Nissan's ECM sees fuel vapor flowing to the engine while the purge valve is supposed to be shut. Low P144A Ford · Powertrain Ford's EVAP test pulled vacuum too fast, meaning part of the vapor path to the fuel tank… Low P1450 Ford · Powertrain Ford's EVAP test pulled vacuum on the fuel tank and the vacuum didn't bleed off as expected. Low P1451 Ford · Powertrain Ford's PCM sees an electrical fault in the circuit of the EVAP canister vent solenoid near… Minor P1456 Honda · Powertrain Honda's EVAP test found a vapor leak on the fuel tank side of the system. Low P1457 Honda · Powertrain Honda's EVAP self-test found a leak on the charcoal canister side, not at the fuel tank or gas… Low P1494 Jeep · Powertrain Your Jeep's EVAP leak detection pump was commanded to stroke, but its internal switch never… Minor P1495 Jeep · Powertrain The PCM found an open or short in the circuit that fires your Jeep's EVAP leak detection pump… Minor P1506 Ford · Powertrain Ford's idle speed stays above target even though the PCM has closed the idle air valve as far… Low P1507 Ford · Powertrain Ford's idle keeps dropping below target even with the idle air valve commanded wide open, often… Low P1516 Chevrolet · Powertrain The electronic throttle didn't move to where the computer commanded, so the engine drops into… Moderate P1518 Ford · Powertrain Ford's intake runner plates didn't close when commanded, so low-rpm torque suffers. Often… Low P1519 Honda · Powertrain The PCM found a fault in the idle air control valve (IACV) circuit on a Honda with a cable… Moderate P1529 Kia · Powertrain Your Kia's transmission computer found a fault and asked the engine computer to light the check… Moderate P1602 Volkswagen · Powertrain The engine computer saw its constant battery feed drop too low – usually a disconnected, flat… Low P1603 Toyota · Powertrain Toyota's ECM logged that the engine stopped by itself while running, without the key being… Moderate P1604 Toyota · Powertrain Toyota's ECM recorded a start that took too long, failed, or died within seconds of firing. Moderate P1605 Toyota · Powertrain On newer Toyotas the idle sagged below about 400 rpm; on some older ones it flags the ECM's… Low P1607 Honda · Powertrain The Honda engine computer's self-test found a fault inside its own circuitry. Moderate P1610 Nissan · Powertrain After repeated failed immobilizer checks, the Nissan ECM has locked itself and won't let… Moderate P1612 Nissan · Powertrain The Nissan ECM and the immobilizer (IMMU or BCM) couldn't complete their ID exchange, so… Moderate