What does code P0505 mean on a Aston Martin and is it safe to drive?
P0505: Idle Air Control System Malfunction. Here's what it means on your Aston Martin, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
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What this code means
The idle air control (IAC) system is not maintaining idle speed within the expected range. This code appears on older vehicles with a separate IAC valve; on drive-by-wire systems a similar issue triggers P0507 or P0506.
Common causes for your Aston Martin
- Dirty or failed idle air control valve
- Vacuum leaks affecting idle circuit
- Throttle body carbon buildup
- Faulty IAC motor or wiring
Symptoms
- Check Engine Light
- High, low, or fluctuating idle
- Stalling at stops
- Hard starting when warm
Typical fixes
- Clean or replace idle air control valve
- Clean throttle body
- Check for vacuum leaks
- Inspect IAC wiring and connector
Repair cost range
For a Aston Martin, repairs for P0505 often fall between $80 and $350, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.