P2602Cooling
Coolant Pump Control Circuit Low
P2602 means the coolant pump control circuit voltage is lower than expected, often from a short to ground or a failed pump.
🚗 Short trips are usually okay, but monitor temperature. A low circuit fault can keep the pump from running.
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🎯 Top Causes, Ranked by Likelihood
#1Short to ground in wiring$100-$350
Chafed wiring shorts the control circuit to ground.
#2Failed coolant pump$150-$600
An internally shorted pump pulls the circuit low.
#3Blown fuse$20-$80
A blown fuse removes power from the circuit.
#4ECM driver fault$500-$1200
The control module output has failed low.
🩺 Common Symptoms
- Check engine light
- Engine overheating
- Coolant pump not operating
- Warning lamp for cooling in some vehicles
💰 Repair Cost: DIY vs Shop
📋 Free OBD2 Code Cheat Sheet
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🔧 How to Diagnose P2602
1Inspect wiring for shorts to ground
2Check the pump fuse
3Test the pump resistance for an internal short
4Verify circuit voltage with a scan tool and meter
❓ Frequently Asked Questions
Can I drive with P2602?
Only for short trips while watching temperature. A non-running pump can cause overheating.
What does circuit low mean?
The control voltage is lower than expected, usually from a ground short or a shorted pump.
How much to fix P2602?
Wiring repairs may be under $200; a new pump typically runs $200-$700.
🔗 Related Codes
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