OBD-II code · Powertrain (generic, extended)
P26D1 Engine Coolant Pump Control Module System Voltage High
The smart coolant pump module reports the system voltage above operating range. Pump output is reduced or disabled to protect the module.
Is it safe to drive with P26D1?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyAlternator regulator failed to limit output
- Less likelyLoad dump transient after disconnecting a heavy load
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–3.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Smart Coolant Pump Module, Charging System
Related codes
- P26CEEngine Coolant Pump Overspeed/Air In System
- P26CFEngine Coolant Pump Control Module System Voltage
- P26D0Engine Coolant Pump Control Module System Voltage Low
- P26D2Engine Coolant Pump Control Module Over Temperature
- P26D3Engine Coolant Pump Supply Voltage Circuit
- P26D4Engine Coolant Pump Supply Voltage Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.