Powertrain
generic / SAE
P26D4
Engine Coolant Pump Supply Voltage Circuit Low
The dedicated supply voltage to the coolant pump module is below operating range. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number6 / D4
Possible causes
- High-resistance battery feed high
- Weak battery sags under pump current medium
- Connector pins corroded - high contact resistance low
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 80–600 €
- Estimated time: 0.5–2.5 h
- Component: smart coolant pump module
- Component: supply circuit
- Component: battery
- MIL / check engine light
Sources
References
sae:J2012