Coolant Pump Control Circuit Open
The P261A code indicates that the Powertrain Control Module (PCM) has detected an open circuit in the control circuit of the electric coolant pump. This pump is responsible for circulating coolant through the engine and heater core, especially after shutdown to prevent hot spots. An open circuit means there is a break in the wiring or a failed component, preventing the pump from operating correctly.
01. Most Common Causes
- Blown fuse or faulty relay for the coolant pump
- Open or shorted wiring in the pump control circuit
- Failed electric coolant pump motor
- Faulty PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine overheating, especially in stop-and-go traffic
- Reduced heater performance
- Coolant leaks from the pump area
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P261A and check for related codes.
Step 2: Inspect the coolant pump fuse and relay; replace if blown.
Step 3: Visually inspect the pump connector and wiring for damage or corrosion.
Step 4: Test the pump motor by applying direct battery voltage; if no operation, replace pump.
Step 5: Check for continuity between the PCM and pump connector; repair open circuit as needed.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, driving with an inoperative coolant pump can cause engine overheating and serious damage. It is best to have the vehicle towed to a repair shop.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on whether it's a fuse, relay, or pump replacement.