Symptoms and Severity
The conditions that may trigger this code can also cause internal damage to the engine or fuel system and should be considered urgent. Symptoms of a P2462 code may include:
- Reduced engine performance
- Excessive black smoke from engine exhaust
- Increased engine temperatures
Causes
Potential causes for this code definition include:
- Exhaust leaks
- Open/short circuit(s) in DPF pressure sensor circuit B
- Faulty DPF pressure sensor
- Clogged, cracked, or collapsed DPF pressure sensor tubes/pipes
- Empty diesel exhaust fluid tank
- Incorrect diesel exhaust fluid
Diagnostic and Repair Procedures
A good starting point is always to check the technical service bulletins (TSBs) for your specific vehicle. Your issue might be a known problem with a published manufacturer fix that could save you time and money during diagnosis.
To properly diagnose a P2462, I need a digital volt/ohmmeter, manufacturer service manual, and diagnostic scanner.
I would begin my diagnosis with a visual inspection of related wiring harnesses and connectors. I would inspect wiring routed near hot exhaust components and/or sharp edges. This saves time if I’m certain to check alternator output, battery voltage, and battery terminal ends at this point.
My next step would be connecting the scanner and retrieving all stored codes and freeze frame data. I would write down this information for future reference, then clear all stored codes.
Using the DVOM, I would follow manufacturer recommendations for testing the DPF pressure sensor. I would consult the service manual for specific instructions. Sensors that don’t meet manufacturer resistance specifications should be replaced.
If the sensor checks out, I would continue by checking DPF pressure sensor supply lines for obstructions and/or damage. I would replace lines that are burned, cracked, or collapsed (high-temperature silicone lines are recommended).
If the supply sensor lines are intact and the sensor is operational, I would proceed with testing system circuits. To avoid PCM damage, I always disconnect related controllers before testing resistance and/or continuity with the DVOM.
Additional Diagnostic Notes:
- DPF regeneration fluid should be checked before diagnosing this code
- When P2462 is stored, I’ve found that clogged sensor ports and blocked sensor tubes are common
- DPF pressure sensor lines that have melted or been cut may need rerouting after replacement