P0508 – Idle Air Control Circuit Low

Description

The ECM detects a low voltage signal in the idle air control circuit.

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Symptoms

  • Low idle
  • Stalling
  • Poor acceleration

Causes

  • Short to ground
  • Faulty IAC valve
  • Wiring issues

Diagnosis

  • Monitor IAC voltage
  • Inspect wiring
  • Check valve operation

Repair

  • Repair wiring
  • Replace IAC valve