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 coolant pump. This pump is responsible for circulating coolant through the engine and, in some vehicles, the turbocharger or heater core. An open circuit means there is a break in the electrical path, preventing the pump from operating. This can lead to engine overheating, reduced heater performance, and potential engine damage if not addressed.
1. Most Common Causes
- Faulty coolant pump motor
- Open or shorted wiring in the pump control circuit
- Blown fuse or relay for the coolant pump
- Failed PCM (rare)
2. Symptoms You Will Notice
- Engine overheating
- Check Engine Light illuminated
- Poor heater performance
- Coolant leaks near the pump
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Visually inspect the coolant pump and its wiring for damage, corrosion, or loose connections.
Step 3: Test the coolant pump fuse and relay with a multimeter.
Step 4: Check for power and ground at the pump connector using a wiring diagram.
Step 5: If power and ground are present, test the pump motor resistance; replace if out of spec.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, driving with this code can cause engine overheating and severe damage. It is recommended to 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 may cost $50-$150, plus labor for diagnosis and replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.