OBD
P0508
Idle Air Control System Circuit Low
What it means
P0508 means Idle Air Control System Circuit Low.
Check these first
- A short to ground in the idle air control circuit
- A failed idle air control valve
- Corroded idle air control wiring
- A faulty PCM driver
What to do next
- Check the idle air control circuit for a short to ground
- Measure the idle air control valve resistance
- Inspect the idle air control wiring and connector
- Replace the idle air control valve if the circuit is shorted
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.