P2603
Coolant Pump A Control Circuit High
1999-2000 BMW 323i E46 2.5L I6 🇩🇪
Moderate SeverityPowertrain
Description
High voltage on auxiliary coolant pump circuit.
Symptoms
- Check engine light
- Pump runs constantly
Common Causes
- Open ground
- Short to power
- Control module issue
Diagnostic Steps
- Check ground circuit
- Measure voltage
Repair Notes
Repair wiring or replace pump.
Related Codes
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- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
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P2603 on Other Vehicles
Common Questions
What does code P2603 mean on a 1999-2000 BMW 323i E46?
P2603 stands for "Coolant Pump A Control Circuit High". High voltage on auxiliary coolant pump circuit.
What are the symptoms of P2603 on a BMW 323i E46?
Common symptoms of P2603 include: Check engine light, Pump runs constantly.
What causes P2603 on a 1999-2000 BMW 323i E46?
Common causes of P2603 include: Open ground, Short to power, Control module issue.