P2DD4
Control Pilot Charging Switch B Stuck On
The control pilot charging switch B reports a stuck on condition. SAE J1772 charging signal handshake may be compromised.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
Common causes
Ordered by how often each turns out to be the cause.
- Contacts welded closedCommon
- Driver stuck onPossible
- Carbon or debris buildup preventing free movementLess likely
Parts involved
- Control Pilot Switch B
- Wiring Harness
- Bms
P2DD4 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.