P0472: Exhaust Pressure Sensor A Circuit Low
What to do
Driveable, but on a diesel do not leave it; this sensor governs particulate filter regeneration.
What this code means
The exhaust pressure signal is below its plausible range. A short to ground or a lost reference voltage accounts for most, but a disconnected or split sensing line produces the same reading from a healthy sensor — and is much more likely given where those lines run.
Likely causes
Start here
- Signal wire shorted to ground · moderate
- Disconnected or split sensor line · moderate
- Faulty exhaust back pressure sensor · moderate
Less common
- Failed sensor reference voltage supply · moderate
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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