Exhaust Pressure Sensor Circuit High
The P0473 code means the vehicle's onboard diagnostic system has detected: Exhaust Pressure Sensor Circuit High. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $80 - $400 (parts and labor)
Best-selling code reader on Amazon. Reads and clears check engine codes on any 1996+ vehicle. Under $30.
Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.
Affiliate links — we earn a commission at no extra cost to you.
Common Symptoms
- Check Engine Light on
- Incorrect exhaust pressure readings
- DPF regeneration problems
- Possible limp mode
Probable Causes (Ranked by Likelihood)
- Open circuit in exhaust pressure sensor wiring Very High
- Failed sensor (open) High
- Disconnected sensor connector Moderate
- Short to reference voltage Low
Frequently Asked Questions
What causes circuit high on the exhaust pressure sensor?
An open wire or disconnected sensor prevents a signal from reaching the PCM, causing a high voltage reading.
Can the sensor connector melt from exhaust heat?
In severe cases yes. If the connector is too close to the exhaust system, heat can damage or melt it over time.
How much is the exhaust pressure sensor?
The sensor costs $30-$100. The pressure hose is $15-$40. Labor is typically $50-$150.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Read sensor voltage. Above maximum at KOEO confirms high/open circuit.
-
Check connector is fully seated.
-
Test wiring continuity.
-
Replace sensor if open.
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
P0473 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
Commonly Affected Vehicles
- 2010-2020 Ram 3500 (6.7L Cummins)
- 2012-2019 Ford F-350 (6.7L Diesel)
- 2008-2018 GMC Sierra 3500 (6.6L Duramax)
- 2011-2020 Chevrolet Silverado 3500 (6.6L Duramax)
Related Codes
Explore More
Was this helpful?
Send this to whoever is fixing the car — your mechanic, or the person asking what the light means.