P26EBAlternative Fuel Control Module System Voltage
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- On bi-fuel engines a separate alternative fuel control module often runs the gas side. In Ford's bi-fuel CNG documentation of 2002 it contains drivers for both injector sets, switches the fuel relays, picks the active fuel from the selector switch and shuts the tank valve when gas pressure falls below 517 kPa. In Roush CleanTech's propane systems for Ford trucks a smart relay module takes on that role and talks to the PCM over CAN. P26EB says the supply voltage measured by or at this module is outside its permitted window, from a weak feed, a bad ground or a charging fault. No manufacturer documents P26EB publicly. CARB requires an approved monitoring plan for alternate-fuel vehicles. The vehicle will usually refuse or drop gas mode and continue on gasoline.
- What you may notice
- Gas mode not available or vehicle switches back to gasoline
- Fuel mode indicator flashes or shows a fault
- Warning light on
- Likely causes
- LikelyLoose, corroded or undersized power or ground connection at the gas control module
- PossibleFaulty fuse, relay or feed circuit of the gas system
- PossibleWeak battery or alternator voltage outside the normal range
- RareInternal fault in the alternative fuel control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.