Network, generic

U0062 Vehicle Communication Bus D (-) High

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

U0062 means the (-) conductor of Vehicle Communication Bus D is forced high, usually by contact with battery plus. Built as high-speed CAN, Bus D carries this fault on CAN-Low, which can then no longer be pulled down any more; onsemi and NXP both list this short among those under which no frame gets through, so every Bus D member eventually ends up bus-off and other networks log its absence. Diagnosing transceivers such as NXP's TJA1041 recognise the short when its resistance is between 0 and 50 ohms. Texas Instruments adds a hardware angle: termination resistors should be rated for such a short, since a bus wire shorted to a 24 V line loads them with the transceiver's short-circuit current times that voltage, enough to destroy a quarter-watt part. No manufacturer documents U0062 publicly. CAN-Low near battery voltage confirms it.

Likely causes

(-) wire of Bus D chafed against a battery or ignition feed
Water in a connector linking the (-) wire to a supply pin
Termination or transceiver damaged by a lasting short to supply

Symptoms

  • All functions on Bus D fail together
  • Lost-communication codes in modules on other networks
  • Warning lamps or fallback modes depending on the modules involved

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 d wiringcan transceiver

Related codes

U0044U0053U0055U0061U0063

References: onsemi.com, nxp.com, ti.com.