P244C: Exhaust Temperature Too Low For Particulate Filter Regeneration Bank 1

What it means

During particulate-filter regeneration, exhaust temperature on Bank 1 is below the calibrated range. The code does not establish why the temperature is low or prescribe a driving action.

At a glance

• Usually lights the check-engine light
• Affects emissions; the car can fail an emissions test

How it works

During DPF regeneration, the engine control module monitors exhaust temperature on Bank 1 to check that conditions are hot enough for soot oxidation. P244C sets when the reported temperature stays below the calibrated range during regeneration. Short, low-load trips, an exhaust leak, a faulty temperature sensor or circuit, or an engine or fuel-system problem may be responsible.

Common causes

Most likely first.

1. Frequent short trips or low engine load during regeneration
2. Exhaust leak reducing temperature
3. Faulty exhaust temperature sensor or wiring
4. Engine or fuel-system fault affecting exhaust heat

Symptoms

• Check engine light or DPF warning light on
• Power loss / limp mode
• Increased fuel consumption
• Failed forced regeneration attempts

How to diagnose it

1. Review freeze-frame data and regeneration status to confirm the low-temperature reading occurred during a Bank 1 DPF regeneration attempt.
2. Check live data from the Bank 1 exhaust-temperature sensor and compare it with other temperature readings and the manufacturer’s specification for plausibility.
3. Inspect the temperature sensor, its connector, and wiring for damage, corrosion, loose connections, or heat exposure.
4. Inspect the Bank 1 exhaust path for leaks that could affect exhaust heat or the temperature reading.
5. If the sensor and exhaust are sound, check for engine or fuel-system faults that could prevent exhaust temperature from rising during regeneration.

Common fixes

• Repair a loose or damaged Bank 1 temperature-sensor connector or wiring.
• Repair an exhaust leak on the affected exhaust path.
• Replace a faulty Bank 1 exhaust-temperature sensor if testing confirms it.
• Repair an engine or fuel-system fault affecting exhaust heat.
• Address operating conditions that repeatedly interrupt regeneration, following the vehicle manufacturer’s instructions.

Can I keep driving?

If the vehicle has reduced power or a DPF warning, avoid heavy loads and long trips until the cause is known. Repeated failed regeneration can increase soot loading and may lead to worsening power loss or limp mode.