P2D2B
Hybrid/EV Battery Pack Coolant Temperature Sensor A/B Correlation
The signals of the HV battery pack coolant temperature sensors A and B do not correlate within the calibrated tolerance. One sensor drifts or installation offset between channels.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: easy
Symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
Common causes
Ordered by how often each turns out to be the cause.
- One sensor characteristic driftedCommon
- Harness incorrectly swapped between channelsPossible
- Pack cell imbalance approaching service thresholdLess likely
Parts involved
- Hybrid Battery Coolant Temp Sensor A
- Hybrid Battery Coolant Temp Sensor B
- Bms
P2D2B is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.