P2D4E
Hybrid/EV Battery Pack J Over Temperature
The BMS detects that battery pack subsection J is operating above the safe temperature threshold. Cell-level cooling or pack thermal management is compromised on this section.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
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.
- Coolant flow to this section reducedCommon
- Cell imbalance causes local heatingPossible
- Ground point with elevated resistanceLess likely
Parts involved
- Hybrid Battery Pack J
- Battery Thermal Management
P2D4E 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.