Powertrain
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Lights the check engine lamp
P2D2B: Hybrid/EV Battery Pack Coolant Temperature Sensor A/B Correlation
Standardized SAE J2012 code · P2Dxx codes
What does P2D2B mean?
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.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
Common causes
- High One sensor characteristic drifted
- Medium Harness incorrectly swapped between channels
- Low Pack cell imbalance approaching service threshold
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2D2B on the same make and model first.
P2D2B in the community
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