Coolant Pump Control Circuit Open
The P2600 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 during low-speed or idle conditions. 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
- Faulty electric coolant pump
- Open or shorted wiring in the pump control circuit
- Blown fuse or relay for the coolant pump
- Failed PCM (rare)
02. Symptoms You Will Notice
- Engine overheating
- Check Engine Light illuminated
- Poor heater performance
- Coolant leaks near the pump
03. Step-by-Step Diagnosis
Step 1: Scan for other codes and check freeze frame data.
Step 2: Visually inspect the coolant pump, wiring, and connectors for damage or corrosion.
Step 3: Test the pump's electrical connector for power and ground using a multimeter.
Step 4: Check the fuse and relay for the coolant pump circuit.
Step 5: If power and ground are present, test the pump's resistance; replace if out of spec.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The coolant pump may not be working, leading to engine overheating and potential damage. Have the vehicle towed to a repair shop.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400, including parts and labor. The coolant pump itself costs $50-$150, and labor adds $100-$250.