Coolant Pump Control Circuit Range/Performance
The P2601 code means the vehicle's onboard diagnostic system has detected: Coolant Pump Control Circuit Range/Performance. This is a critical severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $300 - $900 (parts and labor)
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Common Symptoms
- Coolant pump running but not at correct speed
- Engine running warmer than normal
- Reduced heater output
- Check engine light on
Probable Causes (Ranked by Likelihood)
- Coolant pump motor wearing out Very High
- Voltage drop in pump power supply circuit High
- Debris restricting pump impeller Moderate
- ECM PWM signal out of specification Low
Step-by-Step Diagnostic Procedure
-
Measure coolant pump current draw at various speeds
-
Check power supply voltage at pump connector under load
-
Inspect pump for debris or scale buildup
-
Monitor ECM PWM command vs actual pump speed
Frequently Asked Questions
What does range/performance mean for the coolant pump?
The pump is operating but not at the speed or flow rate the ECM expects. It may be running too slow due to wear, debris, or electrical supply issues.
Can scale buildup affect the coolant pump?
Yes. Mineral deposits and corrosion can restrict the impeller, reducing pump efficiency. Regular coolant flushes help prevent this.
How is the coolant pump speed controlled?
The ECM uses a PWM (pulse width modulation) signal to vary pump speed based on engine temperature, vehicle speed, and other factors.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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