Exhaust Pressure Sensor Circuit Intermittent
The P0474 code means the vehicle's onboard diagnostic system has detected: Exhaust Pressure Sensor Circuit Intermittent. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $80 - $400 (parts and labor)
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Common Symptoms
- Intermittent Check Engine Light
- Occasional DPF issues
- Exhaust pressure readings jump
- Sporadic performance changes
Probable Causes (Ranked by Likelihood)
- Loose exhaust pressure sensor connector Very High
- Intermittent wire break from heat damage High
- Sensor failing intermittently Moderate
- Vibration-induced connection fault Low
Frequently Asked Questions
Why does the exhaust pressure reading jump around?
An intermittent connection in the sensor circuit causes momentary signal loss, making the reading appear erratic.
Can exhaust vibration cause P0474?
Yes, the constant vibration from the exhaust system can loosen connectors and fatigue wiring over time.
Is P0474 a DPF problem?
No, P0474 is a sensor circuit issue. However, it can prevent proper DPF monitoring and regeneration.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Monitor sensor readings for erratic jumps during driving.
-
Wiggle test on connector and wiring.
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Inspect wiring for heat damage or cracking.
-
Replace sensor if wiring is good.
Sources 2
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)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Commonly Affected Vehicles
- 2010-2020 Ford F-250 (6.7L Diesel)
- 2012-2019 Chevrolet Silverado 2500 (6.6L Duramax)
- 2008-2018 Ram 2500 (6.7L Cummins)
- 2011-2020 GMC Sierra 2500 (6.6L Duramax)
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