Exhaust Temperature Too High for DPF Regeneration (Bank 1)
The P244D code indicates that the exhaust gas temperature (EGT) sensor on Bank 1 is reporting temperatures too high for the diesel particulate filter (DPF) regeneration process. This can prevent proper regeneration, leading to a clogged DPF and reduced engine performance. The issue often stems from a faulty EGT sensor, wiring problems, or an over-fueling condition causing excessive exhaust heat.
1. Most Common Causes
- Faulty exhaust gas temperature sensor (Bank 1)
- Wiring or connector issues in the EGT sensor circuit
- Excessive fuel injection (over-fueling) causing high exhaust temps
- Clogged or restricted DPF causing backpressure and high temps
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor fuel economy
- DPF regeneration failure or frequent regeneration attempts
3. Step-by-Step Diagnosis
Step 1: Scan for codes and verify P244D is present. Check for related codes like P244C or P244E.
Step 2: Inspect the EGT sensor wiring and connector for damage, corrosion, or loose connections.
Step 3: Test the EGT sensor resistance and compare to manufacturer specifications.
Step 4: Monitor live data for exhaust temperature readings; compare Bank 1 to Bank 2 if applicable.
Step 5: Check for over-fueling issues (e.g., leaking injectors, faulty fuel pressure regulator).
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances. High exhaust temps can damage the DPF and other components, and the vehicle may enter limp mode.
How much does it cost to fix?▼
Typically $50-$150 for a DIY sensor replacement, or $200-$400 at a shop including labor and diagnostics.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.