Exhaust Pressure Sensor Circuit Low
The P0472 code means the vehicle's onboard diagnostic system has detected: Exhaust Pressure Sensor Circuit Low. 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.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Common Symptoms
- Check Engine Light on
- DPF may not regenerate properly
- Possible turbo issues
- Engine performance reduced
Probable Causes (Ranked by Likelihood)
- Short to ground in exhaust pressure sensor wiring Very High
- Failed sensor (shorted) High
- Corroded connector from heat and moisture Moderate
- PCM input fault Low
Step-by-Step Diagnostic Procedure
-
Read sensor voltage. Below minimum at KOEO confirms low circuit.
-
Disconnect sensor and check for wiring short to ground.
-
Inspect connector for heat damage and corrosion.
-
Replace sensor if internally shorted.
Frequently Asked Questions
What does circuit low mean for the exhaust pressure sensor?
The PCM receives a voltage below the normal range, indicating a short to ground or failed sensor.
Can heat damage the sensor wiring?
Yes, the exhaust pressure sensor and its wiring are exposed to high exhaust temperatures, which can degrade insulation over time.
Is P0472 common on diesel trucks?
Yes, exhaust pressure sensor issues are common on diesel trucks due to the harsh operating environment and soot accumulation.
Sources
This page is built from documented references. Verify against your own service info before repair work.
P0472 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:
Explore More
Was this helpful?
Share carcodefinder.com with a friend who needs to decode their check engine light.