Active DPF Temperature Sensor Circuit Low
The DPF temperature sensor is reading below expected ranges.
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What it means (plain English)
The sensor that checks the temperature of the diesel particulate filter (DPF) is showing a temperature that’s too low, indicating a possible short in the wiring or a faulty sensor.
What the computer is actually seeing
The engine control module (ECM) sees a DPF temperature sensor voltage below 0.5V or a reading consistently below 100°C (212°F) when the engine is running and should be at normal operating temperature.
What a healthy reading looks like
A properly functioning DPF temperature sensor should read between 100°C (212°F) and 600°C (1112°F) under normal operating conditions. The voltage should be around 0.5V at low temperature and increase with temperature.
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 the condition of the wiring and connectors to the DPF temperature sensor for signs of damage or corrosion. If good, proceed to the next step.
- 2Using a multimeter, verify sensor resistance/voltage at the connector. At cold temperatures, expect around 0.5V. If low, replace the sensor. If good, go to the next step.
- 3Check for exhaust leaks or blockages near the DPF that could affect temperature readings. Fix any issues found. If clear, proceed to the next step.
- 4Perform a continuity test on the wiring harness from the ECM to the DPF sensor. If open or shorted, repair as necessary. If okay, consider reprogramming or replacing the ECM.
Common causes
- Faulty DPF temperature sensor
- Short wiring or poor connection in the DPF circuit
- Exhaust leaks affecting sensor readings
- ECM software issue
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Drivability may be affected, especially during regeneration cycles, so get it checked soon.
Will this code come back after clearing?
It can return if the underlying issue isn't fixed; monitor the data after repairs.
Why do I see this code along with issues in the turbo?
Insufficient DPF function can impact overall engine performance, which includes turbo operation.
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