Speed & Idle Control Trouble Codes: List & Fixes

P0505 Powertrain The engine computer can't hold idle speed where it wants it – usually a dirty or sticking idle… Low P0507 Powertrain The engine idles faster than the computer's target – most often extra air is sneaking… Low P2138 Powertrain The two sensors in the gas pedal report different pedal positions, so the PCM limits throttle… Moderate P0500 Powertrain The engine computer lost its vehicle speed signal – speedometer, shifting and cruise control… Moderate P0501 Powertrain A speed signal exists, but it doesn't match what engine rpm, gear and other sensors say the car… Low P0503 Powertrain The speed signal jumps, spikes or reads impossibly high – usually electrical noise or a loose… Low

P0500 Powertrain The engine computer lost its vehicle speed signal – speedometer, shifting and cruise control… Moderate P0504 Powertrain The two contacts in the brake pedal switch disagree on whether you're braking; check the pedal… Moderate P0520 Powertrain The engine computer gets a signal from the oil pressure sensor or switch that makes no… Moderate P0521 Powertrain The oil pressure reading doesn't fit engine speed and temperature – a drifting sensor or truly… High P0522 Powertrain The oil pressure signal is below what a working sensor can produce – usually wiring… Moderate P0524 Powertrain Measured oil pressure fell below the safe minimum. Stop the engine now and check the oil before… Critical P0560 Powertrain The engine computer saw its supply voltage missing or out of range – check fuses and feeds… Moderate P0563 Powertrain The engine computer sees too much supply voltage – usually an overcharging alternator cooking… Moderate P0572 Powertrain The PCM never sees the brake pedal pressed – brake lights may be out and the car may not shift… Moderate P0573 Powertrain The PCM thinks the brake pedal is always pressed – brake lights stay on, often from a missing… Moderate P0638 Powertrain The electronic throttle or diesel intake throttle can't reach its commanded angle, often due… Moderate P1295 Hyundai · Powertrain Hyundai's engine computer no longer trusts the electronic throttle and has cut power as… High P1516 Chevrolet · Powertrain The electronic throttle didn't move to where the computer commanded, so the engine drops into… Moderate P1519 Honda · Powertrain The PCM found a fault in the idle air control valve (IACV) circuit on a Honda with a cable… Moderate P1603 Toyota · Powertrain Toyota's ECM logged that the engine stopped by itself while running, without the key being… Moderate P2100 Powertrain The computer can't push current through the throttle motor – the circuit to the throttle body… High P2101 Powertrain The throttle plate isn't reaching the position the computer asks for, fast enough or accurately… Moderate P2102 Powertrain Too little current or voltage reaches the throttle motor – usually resistance in the feed, not… Moderate P2103 Powertrain The throttle motor circuit draws too much current – a short, a shorted motor or a plate that… Moderate P2104 Powertrain A fail-safe has locked the engine at idle and the gas pedal no longer works – another code… High P2105 Powertrain The engine computer shut the engine off on purpose because it could no longer control… Critical P2106 Powertrain Reduced-power limp mode: the PCM caught a throttle or pedal fault – look for the companion code. Moderate P2107 Powertrain The processor supervising the electronic throttle failed its self-check – a computer fault, not… High P2108 Powertrain The throttle control module isn't performing as expected – check its power, data link… Moderate P2110 Powertrain The PCM is capping engine speed with fuel cut-off because it can't fully trust or close… Moderate P2111 Powertrain The throttle plate stayed more open than commanded – a real safety concern until you know why. High P2112 Powertrain The PCM asked the throttle to open, but it stayed shut – the engine can't get air, so it bogs… High P2118 Powertrain The throttle motor is drawing more or less current than the PCM expects to hold the plate where… Moderate P2119 Powertrain The throttle plate isn't reaching the position the PCM commands, or won't spring back to its… Moderate P2120 Powertrain The PCM lost a usable signal from the main gas pedal sensor, often only for a moment. Moderate