DPF Pressure Sensor Circuit High
High voltage detected in the DPF pressure sensor circuit.
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What it means (plain English)
The DPF pressure sensor measures the pressure before and after the diesel particulate filter (DPF). When the voltage from this sensor is higher than normal, it signals that there may be a problem, like a clogged filter or wiring issue.
What the computer is actually seeing
The engine control module (ECM) sees a voltage reading from the pressure sensor at around 5V when normal operation is expected, but here it reads above 5V, indicating a fault.
What a healthy reading looks like
Normal voltage range is 0.5V to 4.5V; above 4.5V triggers this code.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Inspect the DPF pressure sensor connector and wiring for damage or corrosion. Fix any issues found.
- 2Measure the voltage at the DPF pressure sensor harness. If voltage is above 4.5V, continue to the next step. If normal, replace the sensor.
- 3Check for restriction or clogging in the DPF. Perform a back pressure test on the DPF; values should not exceed 5 inHg at idle. If they do, DPF may need cleaning or replacement.
- 4Inspect for exhaust leaks upstream of the DPF. Any leaks can affect pressure readings and lead to false codes.
- 5Replace the DPF pressure sensor if all other checks are clear.
Common causes
- Clogged DPF
- Faulty DPF pressure sensor
- Short circuit in wiring harness
- Damaged connector
- Exhaust leaks affecting sensor pressure readings
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderately serious; though you can drive, address it soon to prevent further issues.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes, it will likely reappear.
Why does this code sometimes pair with SPN 2659?
SPN 2659 relates to low pressure; both codes can trigger due to a common issue like a blocked DPF.
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