OBD-II code · Powertrain (generic, extended)
P26D8 Engine Coolant Pump Clutch Stuck On
The coolant pump clutch remains engaged when commanded off. Pump runs continuously, slowing warm-up and increasing parasitic load.
Is it safe to drive with P26D8?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyArmature plate seized to the pulley face
- PossibleDriver stuck on keeps clutch energised
- Less likelyCarbon or debris buildup preventing free movement
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–3.5 h
- Emissions test
- Likely to fail
- Parts involved
- Coolant Pump Clutch
Related codes
- P26D5Engine Coolant Pump Supply Voltage Circuit High
- P26D6Engine Coolant Pump Clutch Control Circuit / Open
- P26D7Engine Coolant Pump Clutch Performance/Stuck Off
- P26D9Engine Coolant Pump Clutch Control Circuit Low
- P26DAEngine Coolant Pump Clutch Control Circuit High
- P26DBEngine Sound Control A Circuit / Open
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.