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P2601 OBD-II Trouble Code: Coolant Pump Control Circuit Range/Performance

Check Engine Light

P2601 code definition

The P2601 code is a general OBD-II diagnostic trouble code (DTC) that indicates a fault with the coolant pump control circuit range/performance.

What the P2601 code means

The coolant pump is an electronically controlled auxiliary pump used to support the coolant system with extra flow. This extra flow is used to keep the coolant circulating at low RPMs and also when the engine is off. When the ECM detects out-of-range voltage or poor performance, it sets the P2601 code. When the code is set, it triggers the Check Engine Light to be visible on the dashboard. The code will remain until normal operation is found or the fault is repaired.

What causes the P2601 code?

The most likely causes of the P2601 code are:

  • Faulty auxiliary coolant pump relay
  • Open or short in the coolant pump harness
  • Failed coolant pump
  • Poor electrical connection

What are the symptoms of the P2601 code?

The most common symptoms are:

  • Check Engine Light visible on dash
  • Engine may overheat
  • The heater does not get hot

How does a mechanic diagnose the P2601 code?

A qualified technician will follow these steps in their entirety to diagnose the P2601 code:

  • Using a scan tool hooked up to the vehicle's DLC port, check for any codes stored in the ECM

  • Note all codes stored as well any freeze frame data that is present.

  • Clear all codes for a fresh slate

  • Perform a road test of the vehicle under similar circumstances to the freeze frame data

  • Check that P2601 is present

  • Perform a visual inspection to look for any signs of failed components or coolant leaks

  • Check for auxiliary pump operation

  • Test the coolant pump relay

  • Use a multimeter check for voltage present at the coolant pump

Common mistakes when diagnosing the P2601 code

The most common mistake is made when voltage is not found at the coolant pump and the pump is replaced, when all along it was the relay that was at fault. Step-by-step diagnosis simplifies and greatly increases the accuracy of repairs.

How serious is the P2601 code?

P2601 can cause overheating, which can lead to serious damage to the engine. A vehicle that is overheating should not be driven until the fault is repaired.

What repairs can fix the P2601 code?

The most likely repairs to fix the P2601 code are:

  • Repairing or replacing the coolant pump wiring harness
  • Coolant pump relay replacement
  • Fixing the electrical connection
  • Coolant pump replacement

Additional comments for consideration regarding the P2601 code

An advanced level scan tool will be helpful in diagnosing the P2601 code. The advanced level scan tool allow the technician to access the live data stream from the ECM.

Need help with a P2601 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
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