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U061E Lost Communication With Battery Isolation/Voltage Stabilization Control Module

Check engine lightUsually off

EmissionsNot relevant

Drive cycleNot required

Limp modeNo

A battery isolation or voltage stabilization module separates a second 12 V battery or protected loads from the starter circuit, so that cranking during an automatic restart does not drag the voltage of the rest of the vehicle down. A GM patent (US 9,803,608) describes such an isolator built from MOSFET switches. U061E means the powertrain controller has lost contact with this module. Ford documents it on 2021 and 2022 F-150 trucks with the 3.5 L PowerBoost hybrid (special service message SSM 50843): U061E, often with P2C44, turns on the powertrain malfunction (wrench) lamp rather than the check-engine light. Ford blames a poor ground circuit GD132 or a failed auxiliary battery isolator and wants the ground and the auxiliary battery tested before the isolator is replaced. U041A covers invalid data from the same module.

Likely causes

Poor ground connection of the isolator circuit (Ford ground GD132)

Weak or deeply discharged auxiliary battery

Battery isolator module itself failed

Communication wire or connector to the module damaged

Symptoms

Powertrain malfunction (wrench) lamp on Ford trucks
Additional battery or isolator code such as P2C44

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€50–600

Time0.5–2.5 h

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

Parts involved

battery isolation modulevehicle bus wiring

References: static.nhtsa.gov, patents.google.com.