Network, generic

U0067 Vehicle Communication Bus E (+) Low

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

U0067 tells of the (+) conductor of Vehicle Communication Bus E being grounded. For a Bus E built as a high-speed CAN that is CAN-High, which a dominant bit needs to raise by about a volt; grounded, it cannot. onsemi describes the resulting cycle: the controller attempts a start-of-frame, fails, flags errors, becomes error passive and finally bus-off, then must wait for 128 groups of eleven recessive bits before it may try again, so its transmit line is active only about 2 % of the time. Every Bus E node goes silent, and modules on other networks log them as missing. NXP's fault-tolerant TJA1055 low-speed chip, by contrast, carries on despite the same short. No manufacturer documents U0067 publicly. CAN-High at a few ohms to ground with the battery off confirms it.

Likely causes

(+) wire of Bus E chafed through to body ground
Harness trapped behind the dashboard or a trim panel
Shorted transceiver in a module on Bus E

Symptoms

  • All functions on Bus E fail together (high-speed type)
  • Missing-message codes in modules on other networks

Repair estimate

DifficultyHardWorkshop job
Parts and labour€60–800
Time1–5 h

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

Parts involved

bus e wiringcan transceiver

Related codes

U0040U0058U0064U0066U0068

References: onsemi.com, nxp.com, law.cornell.edu.