P200C
Particulate Filter Over Temperature (Bank 1)
A temperature sensor at the diesel particulate filter (DPF) on bank 1 has exceeded the safe limit — typically during a runaway regeneration. Continued operation can melt or crack the substrate.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Symptoms
- Check engine light or DPF warning light on
- Power loss / limp mode
- Increased fuel consumption
- Failed forced regeneration attempts
Common causes
Ordered by how often each turns out to be the cause.
- Excessive soot load triggers runaway regenerationCommon
- Post-injection over-fueling during regenerationPossible
- DPF temperature sensor reading drifts highLess likely
Parts involved
- Diesel Particulate Filter
- DPF Temperature Sensor
- Regeneration Strategy
P200C is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.