Network, generic

U0075 Control Module Communication Bus C Off

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

Which traffic runs on Bus C differs from brand to brand, so U0075 means little until the storing module is known. On the 2015 Cadillac Escalade with Driver Assist, the active safety module records it alongside radar and camera codes; GM found that a worn diagnostic interface or cable on DLC pins 3 and 11, where the object detection network ends, can create these entries falsely. On the 2020-24 CT5, U0075 together with lost-communication codes led to CAN 1 wires 4986/4987 chafed on the passenger seat frame, with steering, stability and airbag messages. The 2026 Dodge Charger 3.0 turbo uses the code under the J2012 name, set falsely with MIL and cured by new PCM software. First identify the module and its network, then measure.

Likely causes

Bus C wires chafed on a seat frame or body edge
Engine module software setting the code falsely
Defective diagnostic interface or cable creating false entries

Symptoms

  • Service messages for steering, stability control or airbag
  • Driver assistance, radar or front camera unavailable
  • MIL on with no driveability complaint (FCA)

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 c wiringcan transceiver

Related codes

U0046U0074U0076U0131U0151

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, onsemi.com.