What Does P261C Mean?
The PCM has detected a low voltage condition in the coolant pump B control circuit. This indicates voltage is present but below the threshold needed for proper pump operation.
Common Causes
35%
High resistance in coolant pump B power or ground circuit
25%
Corroded connectors causing voltage drop in pump circuit
20%
Weak battery or charging system providing insufficient voltage
12%
Failing PCM output driver with reduced voltage output
8%
Partially shorted coolant pump motor drawing excessive current
Diagnostic Steps
1
Step 1: Measure voltage at coolant pump connector with pump commanded on (should be near battery voltage)
2
Step 2: Check for voltage drop in power and ground circuits using voltage drop testing
3
Step 3: Inspect and clean all connectors in coolant pump circuit, particularly ground connections
4
Step 4: Test battery and charging system voltage under load
5
Step 5: Measure current draw of coolant pump and compare to specifications to rule out motor fault
Estimated Repair Cost
$100 - $650
Parts + labor, varies by vehicle and location
The PCM has detected a low voltage condition in the coolant pump B control circuit. This indicates voltage is present but below the threshold needed for proper pump operation.
The most common cause of P261C (Coolant Pump "B" Control Circuit Low) is: High resistance in coolant pump B power or ground circuit
Typical repair costs for P261C range from $100 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Reduced cooling pump performance may result in engine overheating, especially during stop-and-go traffic or high ambient temperatures.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P261C to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Cooling System
Difficulty
Type
Generic (SAE)
Recommended Tools
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