P2680 code meaning
Coolant Degassing Valve Control Circuit High
Powertrain system Generic code P26xx codes Check engine light
What P2680 means
P2680 is the high-voltage fault of the degassing valve drive: the controller cannot pull the line down, so the valve stays in its unpowered state whatever is commanded. A wire touching a battery feed, an internally open solenoid, or a defective output transistor are the classic reasons. Because degassing only works when bubbles can reach the expansion tank, where the coolant calms and releases trapped gas, a valve stuck in the wrong state may leave air in the engine circuit or slow warm-up, depending on its default. No manufacturer documents P2680 publicly, and no threshold is published. The monitoring duty comes from CARB's comprehensive component rules. Check the coolant level and look for overheating signs.
P2680 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2680
- Check engine light or stored code
- Air pockets, gurgling or weak cabin heat
- Temperature gauge higher than usual
Common causes of P2680
- Most likelyControl wire shorted to a battery feed
- PossibleInternally open solenoid of the degassing valve
- Less likelyDefective output stage in the control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Coolant degassing valveSolenoidWiring harness
What each part of P2680 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 6 | Area: computer (engine control module) and output circuits. |
| 80 | The exact fault in that area. |
What to do next
- Note P2680 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2680
What does P2680 mean?
P2680 means "Coolant Degassing Valve Control Circuit High". P2680 is the high-voltage fault of the degassing valve drive: the controller cannot pull the line down, so the valve stays in its unpowered state whatever is commanded. It is a generic code, so it means the same on every make.
Is it safe to drive with P2680?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2680 fail an emissions test?
Yes, it can. P2680 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2680 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2680 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.