Coolant Pump A Control Circuit Performance/Stuck Off
The electric coolant pump A is commanded on but does not run. Coolant temperature climbs faster than expected with no flow detected.
Affected components
- Coolant pump a
- Pump motor
Common causes
- High likelihood: Pump motor seized by debris or sediment
- Medium likelihood: Cracked rotor magnet decouples drive
- Low likelihood: Carbon or debris buildup preventing free movement
Diagnostic notes
- The malfunction indicator lamp may illuminate
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.