P2A28Alternative Fuel Tank Shutoff Valve C Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2A28 tells that the control line of shutoff valve C reads too low. In TransEco Energy's AFCM table the cause is a lead to ground or an interruption; the MIL lights in both dedicated and bi-fuel conversions, and the vehicle continues without a forced change of fuel. Another number, P2A18, appears there alongside. Ford's Boss 302S list of 2014 carries P2A28 too. On cylinders mounted under a truck bed or on a bus roof the harness runs past brackets and clamps, where insulation can wear through. Whether a grounded line leaves the valve shut or pulls it open depends on whether the module switches the supply side or the ground side of the coil. P2A29 covers the high reading, P2A24 the same fault on valve B.
- What you may notice
- Check engine light
- Cylinder C not used or not shut off correctly
- Likely causes
- LikelyInsulation of the valve C wire worn through at a clamp
- PossibleInterrupted lead, reported here by some modules
- RareCoil of valve C shorted internally
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.