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U016C Lost Communication With Fuel Pump Control Module B

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Loose or corroded frame ground at the pump module (Ram G803A)
Fuse or relay for pump B or its driver open
Feedback or bus wiring between pump driver B and PCM damaged
Fuel pump control module B faulty

Symptoms

  • Check engine light on
  • Crank but no start, or stalling
  • Lack of power or rough running under load

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€30–1,000
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel pump module bcan bus wiring

Related codes

U0109U046DU0310P027A

References: fordservicecontent.com, static.nhtsa.gov, roushcleantech.com, law.cornell.edu.