Reductant Injection Air Pressure Sensor Circuit
The P2037 code means the vehicle's onboard diagnostic system has detected: Reductant Injection Air Pressure Sensor Circuit. This is a serious severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $200 - $600 (parts and labor)
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What Are the Symptoms of P2037?
- Check Engine Light on
- SCR system malfunction warning
- Reduced engine power
- Increased NOx emissions
- DEF system warning light
What Causes P2037? (Most Likely First)
- Faulty reductant injection air pressure sensor Very High
- Clogged air supply line to DEF injector High
- Corroded sensor connector Moderate
- Air pump failure affecting DEF system Moderate
- PCM circuit fault Low
Can I Still Drive with P2037?
Short distances only. P2037 is rated serious severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What does P2037 mean?
P2037 indicates a problem with the air pressure sensor in the reductant (DEF) injection system, which ensures proper atomization of diesel exhaust fluid for NOx reduction.
Can I drive with a P2037 code?
You can drive short distances, but the SCR system will not function properly, increasing NOx emissions and potentially triggering a speed limiter on some vehicles.
How much does it cost to fix P2037?
Repairs typically cost $200 to $600 for sensor replacement or air supply line cleaning.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P2037?
-
Confirm P2037 with freeze frame data
-
Inspect DEF injection air pressure sensor and connector
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Check air supply line to DEF injector for blockage
-
Measure sensor signal voltage and compare to specification
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
Which Vehicles Commonly Get P2037?
- 2011-2019 Ford F-250 6.7L Power Stroke
- 2013-2020 Ram 2500 6.7L Cummins
- 2011-2019 Chevrolet Silverado 2500 6.6L Duramax
- 2009-2015 Volkswagen Jetta 2.0L TDI
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