Powertrain, generic · Hybrid propulsion

P0D1C Hybrid/EV Battery Pack Coolant Control Valve B Stuck On

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

P0D1C means coolant control valve B of the battery circuit remains in its active position although the controller has commanded a change. What active means depends on the design: on valve A, Mercedes hybrid battery management distinguishes a shutoff valve that will not close (P0CE000) from one that will not open (P0CE100), which shows that makers map on and off to opposite valve states. For valve B no manufacturer publishes P0D1C in a bulletin or OBD table. Where feasible, CARB wants the parts that heat or cool the battery checked for proper function. A jammed valve, a driver that never switches off, or software misjudging the temperature response are plausible causes. Coolant then keeps flowing through the wrong path, so the pack may be overcooled or heated poorly. The opposite fault is P0D1B.

Likely causes

Valve B jammed in its active position

Output stage or supply that keeps the valve energised

Module software misjudging the temperature response of the loop

Symptoms

MIL or battery thermal system warning
Battery warms slowly in cold weather or charging is slower than usual

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 bwiring harnessbms

Related codes

P0D1B P0D1A P0CE1 P0CE5 P0DEA

References: static.nhtsa.gov, law.cornell.edu.