Coolant Pump Control Circuit Low
The P2602 code means the vehicle's onboard diagnostic system has detected: Coolant Pump Control Circuit Low. This is a critical severity code.
- Keep driving?
- No — stop driving
- DIY difficulty
- hard
- Estimated cost
- $250 - $850 (parts and labor)
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What Are the Symptoms of P2602?
- Engine overheating
- Coolant pump not running at full speed
- Temperature gauge climbing rapidly
- Steam or coolant smell
What Causes P2602? (Most Likely First)
- Short to ground in pump control circuit Very High
- Failed coolant pump motor windings High
- Corroded pump connector causing high resistance Moderate
- ECM driver circuit shorted low Low
Can I Still Drive with P2602?
No — stop driving. P2602 is rated critical severity. Continuing to drive in this state risks further damage — get it looked at before your next trip.
Frequently Asked Questions
Why is the pump not running at full speed?
A short to ground in the control circuit or high resistance in the motor windings reduces the voltage and current available to the pump, slowing it down.
Can corroded connectors cause P2602?
Yes. Corrosion increases resistance in the circuit, dropping voltage at the pump motor. This is especially common in vehicles exposed to road salt.
How do I check pump motor windings?
Disconnect the pump and measure resistance across the motor terminals with a multimeter. Compare to manufacturer specifications. Very low or infinite resistance indicates failure.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P2602?
-
Test pump control circuit for shorts to ground
-
Measure pump motor winding resistance
-
Inspect pump connector pins for corrosion
-
Check ECM pump driver output voltage
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
Which Vehicles Commonly Get P2602?
- 2012-2020 BMW X3
- 2010-2018 Lexus CT200h
- 2014-2020 Ford Fusion Energi
- 2013-2020 Chevrolet Malibu Hybrid
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