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Speed & Idle Control Trouble Codes: List & Fixes

P05xx codes cover vehicle speed signals, idle speed control and several auxiliary inputs, including system voltage, oil pressure sensor circuits and cruise control. Idle problems often come from a dirty throttle body or a vacuum leak rather than a failed idle control part. A vehicle speed sensor fault can also upset the speedometer, shift points and ABS on some vehicles.

57Codes
2.9Average severity
16%High or critical
26%DIY-friendly
Severity distributionSeverity distribution

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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

All codes (9)

All Severity 3+ Severity 4+
P0521 Powertrain The oil pressure reading doesn't fit engine speed and temperature – a drifting sensor or truly… High P0524 Powertrain Measured oil pressure fell below the safe minimum. Stop the engine now and check the oil before… Critical P1295 Hyundai · Powertrain Hyundai's engine computer no longer trusts the electronic throttle and has cut power as… High P2100 Powertrain The computer can't push current through the throttle motor – the circuit to the throttle body… High 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 P2107 Powertrain The processor supervising the electronic throttle failed its self-check – a computer fault, not… High 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

Subsystems

Fuel & Air Metering 193Emission Controls 97Ignition & Misfire 66Transmission 57ECU & Outputs 54Module Communication 43Brakes, ABS & Chassis 36Body Systems 31Hybrid / EV 14