P2602
Coolant Pump A Control Circuit Low
Engine cooling
Generic OBD-II
Medium
What it means
P2602 means the control module has detected low voltage in the control circuit for the electric coolant pump — usually a short to ground, an open, or a failed pump. The pump may not run when commanded, so the main risk is the engine overheating if coolant isn't being circulated. It won't stop the car from starting.
Medium
Can I keep driving? Often drivable short-term, but watch the temperature gauge — if the electric coolant pump isn't running, the engine can overheat.
Common symptoms
What you'll notice
- Check-engine light on
- Engine running hotter than normal, or overheating
- Electric coolant pump not running or running erratically
- Coolant-temperature warning in some vehicles
Common causes
Most likely first
- Faulty electric coolant pumpLikely
- Short to ground or low-voltage fault in the pump control wiringCommon
- Corroded or loose connector at the pump or control moduleCommon
- Blown fuse or relay feeding the pumpLess often
- Faulty control-module (PCM/ECM) driverLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame and check for any coolant/overheating codes set alongside this one.
- Inspect the coolant-pump connector and wiring for corrosion, chafing, or a short to ground.
- Check the pump's power feed, fuse, and relay.
- Test the pump directly; replace it if it won't run on command.
- If wiring and pump are good, suspect the control-module driver. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2602?+
Short trips may be fine, but only while watching the temperature gauge. If it climbs toward hot, stop — overheating can warp the cylinder head or damage the engine.
Can I just clear P2602?+
Clearing it won't help — the code returns as soon as the module sees the circuit fault again. Fix the pump or wiring first.
Related codes
Often seen with P2602
Read & clear P2602 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX