Faulty coolant pump control circuit wiring, such as an open, short, or high resistance; Failed coolant pump relay or control module; Defective coolant pump motor or internal electronics; Corroded or loose electrical connectors at the pump or PCM; PCM software issue or internal driver fault; Low coolant level or air pockets causing the pump to run dry and draw abnormal current; Blown fuse or poor ground connection for the pump circuit

DTC codes / P26xx · Computer and output circuits / P2601

P2601Coolant Pump Control Circuit Range/Performance

Q: What does code P2601 mean?

Coolant Pump Control Circuit Range/Performance. P2601 indicates that the powertrain control module (PCM) has detected an out-of-range or performance fault in the electrical control circuit for the engine coolant pump. The PCM monitors the circuit for expected voltage or current behavior and sets this code when the signal falls outside the programmed limits, which may prevent the pump from running correctly.

P2601 indicates that the powertrain control module (PCM) has detected an out-of-range or performance fault in the electrical control circuit for the engine coolant pump. The PCM monitors the circuit for expected voltage or current behavior and sets this code when the signal falls outside the programmed limits, which may prevent the pump from running correctly.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaComputer and output circuits

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Engine overheating or temperature gauge climbing higher than normal
Reduced heater output or inconsistent cabin heat
Coolant pump not running when the engine is hot, leading to rapid temperature rise
Possible limp mode or reduced engine power if overheating is detected
Coolant boiling or steam from the engine bay in severe cases

Common causes, most likely first

Faulty coolant pump control circuit wiring, such as an open, short, or high resistance
Failed coolant pump relay or control module
Defective coolant pump motor or internal electronics
Corroded or loose electrical connectors at the pump or PCM
PCM software issue or internal driver fault
Low coolant level or air pockets causing the pump to run dry and draw abnormal current
Blown fuse or poor ground connection for the pump circuit

How to diagnose and fix it

Check for any related technical service bulletins (TSBs) or software updates for the PCM
Inspect the coolant level and bleed the cooling system if air pockets are suspected
Perform a visual inspection of the pump wiring and connectors for damage or corrosion
Test the coolant pump fuse and relay, replacing if faulty
Measure resistance and voltage on the control circuit to verify continuity and signal integrity
Command the coolant pump on with a scan tool and listen for operation or measure current draw
If the circuit and relay are good, replace the coolant pump and clear the code

Common Misdiagnosis of P2601

A low coolant level or trapped air can cause the pump to draw abnormal current and set P2601 even when the pump itself is healthy.
The code can be set by a intermittent wiring fault that only appears when the engine is hot or vibrating, so wiggle-testing the harness is essential.
Some vehicles use a PWM-controlled pump where the PCM expects a specific current profile; a generic pump replacement may not match and can re-trigger the code.
A failing thermostat or clogged radiator can cause overheating that mimics a pump fault, but P2601 specifically points to the control circuit, not the cooling system.
Always check for a blown fuse or relay before condemning the pump, as these are common and inexpensive causes.

Can I keep driving with P2601?

If the engine temperature remains normal and the only symptom is the check engine light, you may drive cautiously to a repair shop. If the temperature gauge rises above normal or you see steam, stop driving immediately to avoid engine damage.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.