Powertrain, generic · Hybrid propulsion

P0CE1 Hybrid/EV Battery Pack Coolant Control Valve A Stuck On

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P0CE1 reports that coolant control valve A of the battery circuit remains in its active position although the controller commanded a change. Manufacturers phrase it differently: Mercedes hybrid battery management speaks of a shutoff valve that does not open, Volvo of a valve stuck on in the BECM of the XC90 T8 from model year 2016. Volvo's TJ 32903 first advised erasing the intermittent entry and test driving, a later revision a software upgrade. For the 2020 Audi Q5 TFSI e, bulletins 2059530 and 80C9 state that the temperature difference limits used to judge the valve were too tight; new software followed (also TSB 2067066). Bentley's TPI 2058049 for the Bentayga Hybrid starts with the coolant level of the battery circuit and an actuator test of changeover valve N632. P0CE0 is the opposite fault.

Likely causes

Monitoring limits or software too strict (Audi, Volvo updates)
Low coolant level or air in the battery coolant circuit
Changeover valve mechanically stuck

Symptoms

  • MIL on, usually without driving symptoms
  • Battery cooled or heated longer than needed

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–700
Time0.4–3 h

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

Parts involved

hv battery pack coolant valve awiring harnessbms

Related codes

P0CE0P0CDFP0CE5P0C43

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.