Diesel Particulate Filter Pressure Sensor A Circuit Low
Common Symptoms
- Check Engine Light or Malfunction Indicator Lamp illuminated
- DPF regeneration requests more frequent than normal
- Reduced engine power or derate condition
- Poor fuel economy
- Engine may enter limp mode on some vehicles
Most Likely Root Causes
- Faulty DPF differential pressure sensor
- Damaged or corroded wiring harness to DPF pressure sensor
- Shorted sensor signal circuit to ground
- Corroded or loose electrical connector at DPF pressure sensor
- Failed engine control module (ECM) less common
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Component Location
DPF differential pressure sensor is typically mounted on the exhaust system near the diesel particulate filter or on the firewall with hoses to the DPF.
Manufacturer Notes
Some diesel engines may store this code due to water intrusion into the DPF pressure sensor connector in cold climates or high-pressure wash conditions.
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