P2600

Coolant Pump A Control Circuit/Open

Engine cooling Generic OBD-II Medium

What it means

P2600 means the ECM has detected an open in the control circuit for electric coolant pump 'A', so it can't drive the pump. On engines that rely on an auxiliary electric pump for cooling or cabin heat, this can let temperatures climb under certain conditions.

Medium

Can I keep driving? Usually drivable short-term, but the electric coolant pump may not run — watch the temperature gauge closely, as overheating is possible on some engines (especially turbocharged or hybrid).

Real-world scan data

Seen in

313

scans in the past year

Found in

0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P2600 scans

P2269in 30.4% of scans

P3031in 27.8% of scans

P2002in 26.8% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Electric (auxiliary) coolant pump not running
Coolant temperature rising higher than normal in some conditions
Reduced cabin heat on vehicles that use the pump for heater flow

Common causes

Most likely first

Open or broken wire in the coolant-pump control circuitLikely
Corroded or loose connector at the pump or ECM/PCMCommon
Failed electric coolant pump (open winding)Common
Blown fuse or failed relay feeding the pumpLess often
Faulty ECM/PCM driverLess often

How to diagnose & fix

Work through it in order

Read freeze-frame data, then inspect the pump connector and wiring for open or corroded contacts.
Check the pump's fuse and relay; confirm power and ground at the pump.
Measure the pump winding resistance against spec — replace the pump if open.
Repair any open in the control wire between the pump and the ECM/PCM.
If wiring and pump test good, suspect the ECM/PCM driver. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P2600?+

Often yes for short trips, but keep an eye on the temperature gauge. If it climbs toward hot, stop — an overheating engine can be damaged quickly.

Can I just clear P2600?+

You can, but it returns while the circuit is still open. Fix the wiring or pump first.

Read & clear P2600 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX