Exhaust Temperature Too Low for DPF Regeneration (Bank 1)
The P244C code indicates that the exhaust gas temperature (EGT) sensor on Bank 1 is reporting temperatures too low for the diesel particulate filter (DPF) regeneration process. This prevents the DPF from burning off accumulated soot, leading to potential clogging and reduced engine performance. The issue often stems from a faulty EGT sensor, exhaust leaks, or problems with the regeneration system itself.
1. Most Common Causes
- Faulty exhaust gas temperature sensor (Bank 1)
- Exhaust leak before the DPF
- Wiring or connector issues in the EGT sensor circuit
- Failed DPF regeneration system (e.g., injector, control module)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Loss of engine power
- DPF warning light or regeneration not occurring
3. Step-by-Step Diagnosis
Step 1: Scan for codes and verify P244C is present. Check for additional related codes.
Step 2: Inspect the EGT sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Use a scan tool to monitor EGT sensor readings; compare to expected values during warm-up and driving.
Step 4: Check for exhaust leaks between the engine and DPF using a smoke machine or visual inspection.
Step 5: If sensor and wiring are okay, test the DPF regeneration system components (e.g., fuel injector, glow plugs).
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the DPF may become clogged, leading to costly repairs and potential engine damage.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a DIY sensor replacement, or $200-$400 at a shop including diagnosis and labor.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.