P26D3
Engine Coolant Pump Supply Voltage Circuit
The dedicated supply voltage line to the coolant pump module is faulty. Pump cannot operate without battery feed.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Blown fuse on supply lineCommon
- High-resistance contact in supply harnessPossible
Parts involved
- Smart Coolant Pump Module
- Supply Circuit
P26D3 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.