Possible Causes
WARNING: This page is about a different car, the 2003 Mazda B4000, 2003 Mazda B3000, and 2003 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
Possible causes are:
- Damaged DPFEGR sensor (DTCs P1400 or P1401).
- Damaged PCM (DTCs P1400 or P1401).
- DPFEGR SIG open (DTC P1401).
- DPFEGR SIG shorted to GND (DTC P1400).
- DPFEGR SIG shorted to PWR (DTC P1401).
- SIG RTN open (DTC P1401).
- VREF shorted to GND (DTC P1400).
- VREF shorted to PWR (DTC P1401).