Network, generic

U0080 Vehicle Communication Bus F

Check engine lightUsually off

EmissionsNot relevant

Drive cycleNot required

Limp modePossible

U0080 is the general fault of Vehicle Communication Bus F, and makers give that letter very different networks. In the 2019 Audi A6 and A7 3.0 TFSI the transmission module stores U008000 (Bus F) when its harness chafes on the crossmember or the FlexRay feed rubs on a module bracket, together with parking lock codes P17F4-P17F6 and U010100 in the engine module. Range Rover L460/L461 log U0080-88 (bus off) and U0080-81 (invalid data) if connector CM32B3/4 is not latched. Stellantis security gateways call it Ethernet Bus 1; when the telematics box answers more than 5 s late after start-up, a stored U0080-00 is simply cleared. Volvo and Mack trucks use U008088 for CAN faults on datalink 7 at engine or aftertreatment module. Effects range from none to a transmission warning.

Likely causes

Bus F wiring chafed on a crossmember or bracket

Inline connector of Bus F not fully latched

Module on Bus F starts communicating too late after wake-up (stored code only)

Supply or ground fault of a Bus F module

Symptoms

Transmission or other warning messages in the cluster
Stored code without any noticeable fault
Telematics or app services report errors

Repair estimate

DifficultyHardWorkshop job

Parts and labour€0–900

Time0.3–5 h

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

Parts involved

bus f wiringmodule connectortransmission control module

Related codes

U0064 U0078 U0081 U0089 U0101

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.