P26E3Fuel Mode Indicator Lamp Control Circuit High
- Generic OBD-II code · Powertrain
- How the car detects it
- P26E3 is the opposite case of P26E2: the module that drives the fuel mode lamp sees a voltage on its control line that is higher than its commanded state allows. With a ground-side driver this is usually a short to a 12 V feed, or an open lamp that lets the line float to supply level; with a positive-side driver it points to outside voltage reaching the output. Many output stages switch off to protect themselves once they detect such a fault. The lamp matters on bi-fuel vehicles because it is the driver's only cue to the active fuel: on GM's 2016 Silverado and Sierra CNG it flashes once a second during a changeover and around ten times a second if the gas system has failed. No manufacturer documents P26E3 publicly, and a lamp circuit fault does not alter the exhaust emissions.
- What you may notice
- Fuel mode lamp stays dark
- Driver cannot tell which fuel is in use
- Likely causes
- LikelyLamp control wire shorted to a battery or ignition feed
- PossibleBurnt-out bulb or open LED in the selector switch
- RareDamaged or wet connector at the selector switch
- Repair
- Easy · Often possible to do yourself.Typical cost: €30 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.