Powertrain
generic / SAE
P2603
Coolant Pump Control Circuit Low
The electric coolant pump drive line reads below the lower threshold — typically a short to ground or a failed driver stage.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number6 / 03
Possible causes
- Drive line shorted to ground high
- Driver stage failed medium
- Connector pins corroded - high contact resistance low
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 120–700 €
- Estimated time: 0.5–2.5 h
- Component: electric coolant pump
- Component: coolant pump wiring
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012