NOx Sensor Circuit Low Input (Bank 1)
The DURAMAX-P2202 (Duramax) diesel fault code means: NOx Sensor Circuit Low Input (Bank 1). This is a serious severity code.
- Keep driving?
- Yes, with caution
- DIY difficulty
- advanced
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What Are the Symptoms of DURAMAX-P2202?
- Check Engine Light on
- Emissions or DEF system warning message
- Possible reduced power if the fault is not repaired
What Causes DURAMAX-P2202? (Most Likely First)
- Failed NOx sensor High
- Damaged wiring or a corroded connector near the exhaust High
- Sensor power or ground problem Moderate
Can I Still Drive with DURAMAX-P2202?
Yes, with caution. DURAMAX-P2202 is rated serious severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What does P2202 mean on a Duramax?
P2202 means NOx Sensor Circuit Low Input (Bank 1). The bank 1 NOx sensor signal is below its normal range.
Is P2202 a Duramax-specific code?
No. P2202 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-P2202?
Find which NOx sensor is bank 1 on your truck in the service information.
Inspect the sensor connector and harness for heat damage.
Check the sensor power and ground before replacing it.
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines P2202 as a generic OBD-II code)
P2202 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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