Network, generic

U007E Control Module Communication Bus L Off

Check engine lightUsually off

EmissionsNot relevant

Drive cycleNot required

Limp modeNo

There is no public manufacturer documentation for U007E; the letter L is reserved for vehicles with a dozen or more networks. The code marks the last step of the CAN error ladder. A node stays error active while its counters are below 128 and signals faults with dominant flags; between 128 and 255 it becomes error passive and may flag errors only recessively; once transmit errors exceed 255 it goes bus off and stops sending, as Wikipedia's CAN bus article describes. U007E therefore means that a module has failed repeatedly, not once. What the driver notices depends on what the silent module controls, from a missing comfort function to warning lamps, and partner modules then store their own lost-communication codes.

Likely causes

Persistent short or bad contact on Bus L

Fault inside the reporting module's CAN interface

Symptoms

Single comfort or assistance function missing
Partner modules report lost communication

Repair estimate

DifficultyHardWorkshop job

Parts and labour€60–800

Time0.5–5 h

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

Parts involved

bus l wiringcan transceiver

Related codes

U007D U007F U0100

References: en.wikipedia.org, law.cornell.edu.