P0113 on a GMC: Causes, Fixes & Repair Cost
🟢 Low severity · drivable
Safe to drive — the engine just gets a wrong intake air temperature reading, which may cause slightly rich running.
What P0113 means on a GMC
On a GMC, P0113 means the intake air temperature (IAT) sensor is reporting a high-voltage, open-circuit signal. On many GM vehicles the IAT is a separate sensor mounted in the intake duct, so this code usually points to that sensor or its wiring. The engine may run slightly rich until it is fixed.
Is P0113 common on GMCs?
P0113 is common on GMC trucks and SUVs, where the IAT sensor and its connector sit in the engine bay and corrode over time. Trucks with many years of service and exposure to moisture see this more often. It is a sensor fault, not an engine failure.
Commonly reported on: Sierra, Terrain, Acadia, Yukon.
Symptoms
- Check engine light on
- Slightly rich running or worse fuel economy
- Possible hard starting
- Often no noticeable symptoms
Common causes
- most common: Faulty IAT sensor
- common: Corroded or loose connector
- less common: Damaged wiring to the sensor
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the IAT sensor | Yes | $15–60 |
| Clean the connector terminals | Yes | $0–10 |
| Repair damaged sensor wiring | Mechanic | $50–150 |
Frequently asked questions
Other common GMC codes
P0113 on other brands
Looking for the full (non-brand-specific) guide? See the P0113 code page →
Browse all GMC codes: GMC hub →
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.