P0ECAHybrid/EV Battery Temperature Sensor System - Multiple Sensor Correlation
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0ECA treats the temperature sensors of the hybrid or traction battery as one system: the battery controller compares the readings with each other and flags the group when one of them strays from the rest or shows an impossible value. Ford documents it for its 2019 hybrid and plug-in models. The BECM runs the check all the time and sets P0ECA after three or more 5-second events in which a thermistor deviates from the average by more than 25 °C, reads above 95 °C or reads below −50 °C. Bentley stores P0ECA00 in address 0021, the 48 V super capacitor of the Bentayga's Dynamic Ride, alongside P0A9E and P0AC8; the cure is software version 114, after which the part number ends in F. GM files comparable checks under single-sensor codes such as P0A9C instead. Battery power is reduced.
- What you may notice
- Hybrid or battery warning, MIL depending on manufacturer
- Reduced electric power or charging rate
- On the Bentayga, Dynamic Ride fault message and no roll compensation
- Likely causes
- LikelyOne battery thermistor drifting away from the others
- PossibleBattery controller software misjudging the comparison (Bentley super capacitor, update 114)
- PossibleLoose or corroded connector on the temperature sense harness inside the pack
- RareGenuine local hot spot, e.g. a blocked cooling channel at one module
- 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: €0 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.