2019 Chevrolet P0505: What It Means & Is It Safe to Drive?
P0505 on the 2019 Chevrolet: Idle Air Control System Malfunction. Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
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 on the 2019 Chevrolet
- 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 2019 Chevrolet, repairs for P0505 typically fall between $80 and $350, depending on the root cause and labor rates in your area.
Known issues on Chevrolet
GM P0505 on LS V8 engines is often caused by carbon buildup on the IAC valve or throttle body bore. A complete throttle body cleaning service—including the IAC—resolves the code in most cases. If cleaning fails, the IAC motor may need replacement.
Most commonly affected models