Intake Air Temperature Sensor 1 Circuit High
The DURAMAX-P0113 (Duramax) diesel fault code means: Intake Air Temperature Sensor 1 Circuit High. This is a moderate severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- intermediate
- Estimated cost
- $100-$2,500 depending on component
Down with a Duramax fault on the road?
Get connected with a verified mobile diesel mechanic near you. Verified diesel & reefer techs, launching on the freight corridor.
Find a mobile mechanic →A $30 car code reader can't do diesel. The HD7000 reads full-system codes and does parked DPF regen, idle/speed-limit, and service resets from the cab — on everything from a 6.7 Cummins/Power Stroke/Duramax pickup to Class-8 trucks (Detroit, Paccar, CAT, Volvo, Mack, International).
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Full-system 6/9/16-pin diesel scan tool for Cummins, Paccar, CAT, Detroit and more — plug-and-play, no subscription. A cheaper way to read heavy-duty codes a basic OBD2 scanner skips entirely.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Common Symptoms
- Check Engine Light illuminated
- Reduced engine performance
- Limp mode or 'Service Engine' message
- Rough idle or stalling (sensor-related)
- Hard shift or slip (transmission codes)
Probable Causes (Ranked by Likelihood)
- IAT sensor open circuit Very Likely
- Wiring harness damage or connector corrosion Likely
- Sensor end-of-life (high mileage engines) Possible
- Control module internal fault Less Likely
Step-by-Step Diagnostic Procedure
Connect scan tool and capture freeze frame data showing when fault occurred
Verify battery voltage and all PCM grounds are clean and tight
Back-probe the suspect sensor / circuit with a DMM and compare to spec
Inspect wiring harness for abrasion, chafing, or rodent damage
After repair, clear code and drive a complete drive cycle to confirm fix
Frequently Asked Questions
What is P0113 on a Duramax?
Duramax code P0113 (Intake Air Temperature Sensor 1 Circuit High) is a moderate-severity diagnostic trouble code triggered by the engine control module when it detects a problem in the associated system. A bad 5V reference (P0642/P0643) will cascade into multiple unrelated sensor codes — always diagnose reference voltage first.
Is a Duramax P0113 safe to drive?
Depends on severity — sensor codes usually drivable; PCM/transmission codes should be repaired before continued use.
How much does it cost to fix P0113 on a Duramax?
Component repairs typically $100-$500. Control module replacement $800-$2,500.
P0113 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown: