Powertrain, generic

P0ED1 Hybrid/EV Battery F Voltage Unstable

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0ED1 reports that the voltage of hybrid/EV battery F fluctuates beyond the permitted band instead of staying steadily off, which would be P0ED2 or P0ED3. No manufacturer documents P0ED1 publicly. CARB not only requires every cell and voltage sensor of the storage to be watched, it also asks for proof that cell balancing can hold each cell at its intended voltage, and an unsteady unit voltage is often the first hint that a cell group is running away from the others. Ford's comparable test for battery A uses a 0.5 V spread between one cell and the average, held for 15 seconds. Mechanical causes such as a loose busbar or a sense lead with poor contact make the reading jump with vibration. General code of unit F: P0ED0; the same fault on unit E: P0ECD.

Likely causes

Cell group of unit F drifting because balancing cannot keep up
Loose busbar or cell connector
Sense lead or connector with intermittent contact

Symptoms

  • Warning that comes and goes, often over bumps or under load
  • Short power reductions while driving
  • MIL on

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–3,000
Time0.5–8 h

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

Parts involved

hv battery fbms

Related codes

P0ED0P0ED2P0ED3P0ECDP0B24P0BBD

References: law.cornell.edu, fordservicecontent.com.