Multiple DMPR DTC Detected
Issues with the demand DPF regeneration process.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The engine is having trouble cleaning the diesel particulate filter (DPF) when required, which can cause it to clog up and lead to more problems.
What the computer is actually seeing
The computer expects a certain temperature rise during DPF regeneration (600-800°F) and a specific differential pressure across the DPF (below 3.0 inHg).
What a healthy reading looks like
DPF differential pressure should be less than 3 inHg during normal operation.
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.
- 1Check for any visible exhaust leaks or cracks in the DPF system.
- 2Inspect the wiring and connectors related to the DPF pressure and temperature sensors for corrosion or damage.
- 3Check the DPF's differential pressure; it should be less than 3 inHg.
- 4Validate that the engine is reaching proper operating temperatures during regeneration (600-800°F).
- 5If all checks are good, consider testing or replacing relevant sensors.
Common causes
- Faulty temperature sensors
- Clogged DPF
- Issues with the fuel injector system
- Faulty pressure sensors
Typical repair cost
$$
Related codes
Frequently asked questions
Can I still drive the vehicle with this code?
Yes, but it’s recommended to fix it soon to avoid DPF damage or serious performance issues.
Will this code come back after resetting?
It may, especially if there's an underlying issue that hasn't been addressed.
Why does this code pair with SPN 3206?
SPN 3206 relates to the DPF pressure sensor; issues with one often indicate problems with the other.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →