What it means
During particulate-filter regeneration, exhaust temperature on Bank 1 is above the calibrated range. The code does not by itself establish that the filter is at risk of melting.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The DPF traps soot in the exhaust, and the engine control module raises exhaust temperature during regeneration to burn that soot off. It monitors Bank 1 exhaust temperature while regeneration is active; P244D sets when that temperature exceeds the calibrated range.
Common causes
Most likely first.
- Excessive soot loading causing high regeneration temperatures
- Faulty exhaust temperature sensor or wiring
- Fuel dosing or regeneration control fault
- Restricted exhaust flow
Symptoms
- Check engine light or DPF warning light on
- Power loss / limp mode
- Increased fuel consumption
- Failed forced regeneration attempts
How to diagnose it
- Check freeze-frame data and regeneration status to confirm the temperature was high during a Bank 1 regeneration event.
- Compare live readings from the Bank 1 exhaust temperature sensors with other exhaust temperature readings and check for an implausible spike.
- Inspect the Bank 1 temperature sensor, its connector, and nearby wiring for heat damage, corrosion, or loose connections.
- Check the DPF pressure and soot-load data for evidence of excessive soot or restricted exhaust flow.
- If sensor readings and exhaust flow appear plausible, investigate fuel dosing and regeneration control using the manufacturer's diagnostic procedure.
Common fixes
- Repair a damaged Bank 1 exhaust temperature sensor connector or wiring.
- Replace a faulty Bank 1 exhaust temperature sensor.
- Correct a fuel-dosing or regeneration-control fault.
- Address excessive soot loading or a restricted exhaust after confirming the cause.
Can I keep driving?
Avoid repeated forced regeneration attempts while the Bank 1 temperature is reading too high, and limit driving if power drops or a DPF warning appears. Continued operation may prevent regeneration and worsen soot buildup; the code alone does not prove the filter is melting.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.