U016CLost Communication With Fuel Pump Control Module B
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- U016C concerns fuel pump control module B, the second pump driver in vehicles with two pumps or two tanks; module A has U0109. Ford's 2020-2023 gasoline OBD summary watches pump B through its duty-cycle feedback line: a signal stuck at 0 % or 100 % sets U016C within 2-5 s at 11-16 V. Roush CleanTech's propane-converted Ford trucks pass the state of the second fuel pump relay to the PCM through a smart relay module, so wiring, fuse or relay faults on that path trigger it too. Stellantis case S2108000100 (Ram 1500 2021) shows U0109 and U016C together with a check engine lamp and crank-no-start, cured by cleaning frame ground G803A. CARB requires lost digital links like this to be detected. Fuel supply is at risk; MIL expected.
- What you may notice
- Check engine light on
- Crank but no start, or stalling
- Lack of power or rough running under load
- Likely causes
- LikelyLoose or corroded frame ground at the pump module (Ram G803A)
- PossibleFuse or relay for pump B or its driver open
- PossibleFeedback or bus wiring between pump driver B and PCM damaged
- RareFuel pump control module B faulty
- 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: €30 – €1,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.