Skip the auto shop - Our mechanics make house calls

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

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.


Post a question and get free advice from our certified mechanics.


More related articles

Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance Related Trouble Codes: P2158: Vehicle Speed Sensor B P2160: Vehicle Speed Sensor B Circuit Low P2161:...

Related questions

Q: code p2015 and p2004

The codes are telling you the intake manifold runners are open. They are normally closed while driving and only need to be open when the engine is off. The intake manifold depends on them being closed for proper vacuum. This...

Q: Excessive white smoke out of crankcase tube. Fuel in oil

That is definitely the result of a loss of oil pressure. A very bad oil leak, failed pump or lack of maintenance can be big trouble for an engine especially with such high miles. As long as there is no...

Q: seems to be stuck in 2nd or 1st cant tell

Here are a few things to check next: With a fully charged battery, test the voltage on the ERLS fuse, Key On Engine Off (KOEO) and the transmission connector connected. If the voltage is low at the...