P2668
Fuel Mode Indicator Lamp Control Circuit
Fuel system indicator
Generic OBD-II
Low
What it means
P2668 means the engine computer found a fault in the circuit that drives the fuel-mode indicator lamp — the light that tells the driver which fuel is in use on flex-fuel or bi-fuel vehicles. It affects only the indicator, not how the engine runs, so it's a low-priority electrical fault: usually a bulb, wiring, or connector problem.
Low
Can I keep driving? Safe to drive — this affects only the fuel-mode indicator lamp; the engine runs normally.
Common symptoms
What you'll notice
- Check-engine light on
- Fuel-mode indicator lamp stays off, stuck on, or reads wrong
- No change in how the engine starts or runs
Common causes
Most likely first
- Burned-out fuel-mode indicator bulb or LEDLikely
- Open or shorted wiring in the lamp control circuitCommon
- Corroded or loose instrument-cluster or lamp connectorCommon
- Faulty PCM lamp-driver outputLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame to confirm the lamp control circuit fault.
- Check the indicator bulb/LED and its power and ground.
- Inspect the lamp control wiring and connector for opens or shorts.
- Test the PCM driver output if the wiring is good.
- Repair the circuit and clear the code.
FAQ
Quick answers
Is it safe to drive with P2668?+
Yes. This is an indicator-lamp circuit fault on flex-fuel or bi-fuel vehicles — it doesn't affect starting, running, or which fuel the engine uses. It's a low-priority electrical repair.
Can I just clear P2668?+
It will return until the lamp circuit is fixed, but it's harmless to running the car. Repair the bulb, wiring, or connector to clear it for good.
Related codes
Often seen with P2668
Read & clear P2668 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