Intake Air Temperature Sensor 1 / 2 Correlation
The DURAMAX-P2199 (Duramax) diesel fault code means: Intake Air Temperature Sensor 1 / 2 Correlation. This is a moderate severity code.
- Keep driving?
- Yes, with caution
- DIY difficulty
- intermediate
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What Are the Symptoms of DURAMAX-P2199?
- Check Engine Light on
- Usually no change in how the truck drives
What Causes DURAMAX-P2199? (Most Likely First)
- One sensor reading incorrectly High
- Wiring or connector fault at one sensor Moderate
- Intake air leak near one sensor Low
Can I Still Drive with DURAMAX-P2199?
Yes, with caution. DURAMAX-P2199 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What does P2199 mean on a Duramax?
P2199 means Intake Air Temperature Sensor 1 / 2 Correlation. Intake air temperature sensors 1 and 2 are reporting values that do not agree with each other closely enough.
Is P2199 a Duramax-specific code?
No. P2199 is a generic OBD-II code defined by SAE J2012, so it means the same thing on any vehicle that sets it. The exact conditions GM uses to set it on its diesels are in GM service information.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose DURAMAX-P2199?
After the truck has sat overnight, compare both readings with each other and with ambient temperature.
Inspect both sensors and their connectors.
Check the circuit of the sensor that disagrees.
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines P2199 as a generic OBD-II code)
P2199 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown:
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