What Does P2600 Mean?
The PCM has detected an open circuit or control failure in the electric coolant pump A control circuit. Modern vehicles may use electric auxiliary coolant pumps for enhanced cooling, and this code indicates the pump is not receiving proper electrical signals.
Common Causes
35%
Open circuit in coolant pump wiring harness or broken wire
30%
Failed electric coolant pump with open motor windings
20%
Blown fuse or faulty relay in coolant pump power circuit
10%
Corroded or disconnected coolant pump connector
5%
PCM coolant pump driver circuit failure
Diagnostic Steps
1
Step 1: Check coolant pump fuse and relay operation - test relay with multimeter and swap with known good relay if available
2
Step 2: Disconnect coolant pump connector and measure voltage at pump supply terminal with pump commanded on - should see battery voltage
3
Step 3: Test coolant pump motor resistance using multimeter - compare to specifications (typically 0.5-5 ohms)
4
Step 4: Check ground circuit continuity and perform voltage drop test on ground side while pump is commanded on
5
Step 5: Apply direct power to coolant pump to verify motor operation independent of control circuit
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
The PCM has detected an open circuit or control failure in the electric coolant pump A control circuit. Modern vehicles may use electric auxiliary coolant pumps for enhanced cooling, and this code indicates the pump is not receiving proper electrical signals.
The most common cause of P2600 (Coolant Pump "A" Control Circuit/Open) is: Open circuit in coolant pump wiring harness or broken wire
Typical repair costs for P2600 range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Risk of engine overheating, especially during idle or low-speed operation. Monitor temperature gauge closely and avoid extended idling until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2600 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Cooling System
Difficulty
Type
Generic (SAE)
Recommended Tools
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