OBD-II code · Powertrain (generic, extended)
P2B66 Coolant Pump D Control Circuit/Open
Coolant pump D reports a control circuit/open condition. Coolant circulation through the affected loop cannot be commanded reliably.
Is it safe to drive with P2B66?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyOpen in control wire
- PossibleOpen pump motor
- Less likelyPin pushed back out of connector body
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Usually unaffected
- Parts involved
- Coolant Pump D, Wiring Harness, Ecm
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.