P26D7: Engine Coolant Pump Clutch Performance/Stuck Off

P26D7 is the serious case for a clutched coolant pump: the module has asked the clutch to couple the pump, but the cooling system shows no sign of circulation, so the pump is assumed to stay disconnected. The electrical side may be intact; worn friction faces, a seized armature or a pump that slips under load are typical mechanical reasons. No manufacturer documents P26D7 in public. A comparable failure is documented by Jaguar Land Rover bulletin JLRTB02030NAS1 for its switchable pump on Ingenium 2.0 L petrol engines, though under the general pump code P26CB: when the inner shroud did not move as commanded, the PCM ran the fans at full speed to protect the engine. Without coolant flow the cylinder head heats up locally, so the temperature gauge must be watched and the car should not be driven hard.

Medium severity. Can I keep driving?Watch the temperature gauge. If it climbs or a warning appears, stop the car in a safe place and turn off the engine: overheating can cause serious damage.

Symptoms

Check engine light on
Coolant temperature rises quickly, possible overheating warning
Radiator fans run at high speed
Reduced engine power to protect the engine

Most likely causes

Worn or slipping clutch friction surfaces
Armature or switching mechanism seized in the disengaged position
Slipping or damaged pump drive belt
Implausible coolant temperature input or outdated engine software

What to check, in order

Start with the simplest. You can tick off each step.

With the engine cold, check the coolant level; never do this when the system is hot
Compare the reading with other engine data while varying the engine speed.
Check the actual temperature in live data
Make sure the fan comes on when it should
Check the thermostat and connector
Measure the sensor and replace it if its readings do not make sense

Good to know

Repair difficulty: hard
It can trigger limp mode.
It affects emissions.

What each character of P26D7 means

P: Powertrain: engine and transmission
2: Generic code: same on every make
6: Control modules and outputs
D7: Specific fault in that system

Frequently asked questions

Can I keep driving with code P26D7?

Watch the temperature gauge. If it climbs or a warning appears, stop the car in a safe place and turn off the engine: overheating can cause serious damage.

What causes code P26D7?

The most common causes are: worn or slipping clutch friction surfaces; armature or switching mechanism seized in the disengaged position; slipping or damaged pump drive belt.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.