P0113 GMC Sierra 1500
Intake Air Temperature Sensor 1 Circuit High · Powertrain Code · Low · Repair: Easy
What is P0113?
The IAT sensor is reading above its expected range — possible open circuit.
When the GMC Sierra 1500 triggers code P0113 (intake air temperature sensor 1 circuit high), it typically points to an issue in the powertrain system. Below you'll find the most common causes, symptoms, and repair options specific to the GMC Sierra 1500.
This repair is rated easy, meaning basic tools, no lift needed.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your GMC Sierra 1500.
Common Causes on GMC Sierra 1500
- Failed Intake Air Temperature (IAT) sensor or IAT circuit in the MAF sensor assembly
- Disconnected or corroded IAT sensor connector
- Open circuit in IAT sensor wiring
- Damaged MAF/IAT combo sensor (GM often integrates IAT into the MAF)
Symptoms
- Check Engine Light on
- Slightly rough idle when cold
- Minor fuel economy decrease
- Engine may run slightly rich
Notes for GMC Sierra 1500
On most GM vehicles, the IAT sensor is built into the MAF sensor — replacing the MAF resolves the IAT code as well.