Powertrain, generic

P0ECA Hybrid/EV Battery Temperature Sensor System - Multiple Sensor Correlation

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

One battery thermistor drifting away from the others
Battery controller software misjudging the comparison (Bentley super capacitor, update 114)
Loose or corroded connector on the temperature sense harness inside the pack
Genuine local hot spot, e.g. a blocked cooling channel at one module

Symptoms

  • 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

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€0–2,500
Time0.5–6 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

hv battery temp sensorsbms

Related codes

P0ECBP0A9CP0AC6P0A9EP0AC8P0A1F

References: fordservicecontent.com, static.nhtsa.gov, gsi.ext.gm.com, law.cornell.edu.