What Does P261B Mean?
The PCM has detected that coolant pump B is not performing as expected based on feedback or current draw monitoring. The pump may be running but not providing adequate flow or operating outside normal parameters.
Common Causes
35%
Mechanically failing or clogged coolant pump B with reduced efficiency
25%
High resistance in pump control circuit reducing pump speed
20%
Low voltage supply to coolant pump affecting performance
12%
Coolant system blockage or air pockets affecting pump operation
8%
Faulty coolant pump internal motor winding developing high resistance
Diagnostic Steps
1
Step 1: Measure current draw of coolant pump B during operation and compare to specifications
2
Step 2: Check voltage supply at pump during operation (should be near battery voltage)
3
Step 3: Inspect coolant system for blockages, restrictions, or air pockets
4
Step 4: Test pump operation by commanding on with scan tool and verifying coolant flow
5
Step 5: Check for excessive resistance in pump ground circuit
Estimated Repair Cost
$150 - $700
Parts + labor, varies by vehicle and location
The PCM has detected that coolant pump B is not performing as expected based on feedback or current draw monitoring. The pump may be running but not providing adequate flow or operating outside normal parameters.
The most common cause of P261B (Coolant Pump "B" Control Circuit Range/Performance) is: Mechanically failing or clogged coolant pump B with reduced efficiency
Typical repair costs for P261B range from $150 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Reduced cooling efficiency may lead to engine overheating under load or in hot weather. Monitor temperature gauge closely.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P261B to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Engine Cooling System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
