P0E9CDC/DC Converter Current Sensor B Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0E9C means current sensor B of a DC/DC converter gives a value within its electrical window that does not match the operating state, for example a current that stays put while the load changes, or that differs from the figure the controller derives from voltages and switching. No manufacturer documents P0E9C publicly. Ford describes such a rationality test for the boost converter of its hybrids under P0A94: a gap above 50 A between calculated and measured inductor current, lasting over 4 s in controlled operation, flags the converter. FCA treats the equivalent sensor A code P0E52 on the Ram 1500 eTorque as a one-trip fault after a software update. Circuit faults of sensor B are P0E9B, P0E9D and P0E9E.
- What you may notice
- MIL, sometimes after a single trip
- Reduced converter output and weak 12 V charging
- Power reduction warning possible
- Likely causes
- PossibleCurrent sensor B drifting or with a shifted zero point
- PossibleFault in the converter power stage causing unexpected currents
- RareSoftware with an unsuitable plausibility window
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €60 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.