Particulate Filter Regeneration Temperature Sensor Circuit Range/Performance Problem
The system detected a performance issue with the particulate filter temperature sensor.
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What it means (plain English)
The truck's computer isn't getting the right temperature readings from the diesel particulate filter (DPF) sensor, which affects the regeneration process.
What the computer is actually seeing
The ECM monitors the temperature sensor in the DPF system. If the temperature reading is outside the expected range (for example, below 200°F or above 1400°F during regeneration), it triggers this code.
What a healthy reading looks like
Expected DPF temperature during normal operation is between 200°F and 1400°F; during regeneration, it should be higher.
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 signs of wiring damage or poor connections at the DPF temperature sensor; repair as needed. Decision point: If wiring is good, go to step 2.
- 2Measure the voltage at the DPF temperature sensor connector with the ignition on. You should see near battery voltage (around 12-14V). Decision point: If voltage is out of range, check power and ground to the sensor.
- 3Inspect the DPF for blockages or soot buildup; clean or replace if necessary. Decision point: If the DPF is clean but the code persists, go to step 4.
- 4Replace the DPF temperature sensor; clear the code and check if it comes back. Decision point: If the code returns, further investigate the ECM or exhaust system.
Common causes
- Faulty DPF temperature sensor
- Wiring issues or poor connections
- Exhaust leaks affecting sensor readings
- DPF contamination or blockage
- Faulty ECM programming
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
You can drive, but be aware of potential poor exhaust performance and increased emissions. Fixing it soon is recommended.
If the code comes back after replacing the sensor, what should I do?
Recheck wiring and connectors, and consider scanning for additional fault codes that may point to a deeper issue.
Why does this code often appear with others like P245A or P245B?
These codes are related and indicate issues with the DPF system; if one sensor fails, others can also be affected.
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