Coolant Pump Control Circuit Range/Performance
The P261B code indicates that the Engine Control Module (ECM) has detected an issue with the coolant pump control circuit, specifically that the pump's performance is outside the expected range. This can be due to a faulty coolant pump, electrical issues in the control circuit, or a malfunctioning ECM. The coolant pump is responsible for circulating coolant through the engine and other components, and improper operation can lead to overheating.
01. Most Common Causes
- Faulty coolant pump
- Open or shorted wiring in the control circuit
- Poor electrical connections at the pump or ECM
- Failed ECM
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine overheating
- Coolant leaks
- Reduced heater performance
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Visually inspect the coolant pump and wiring for damage or corrosion.
Step 3: Test the coolant pump control circuit voltage and ground with a multimeter.
Step 4: Check the coolant pump resistance and compare to specifications.
Step 5: If all else is normal, test the ECM output or replace the pump.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can lead to engine overheating and potential damage. Have the issue diagnosed and repaired promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, but can be higher if the coolant pump or ECM needs replacement.