Network, generic

U008D Vehicle Communication Bus G (+) High

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U008D is stored when the (+) wire of Vehicle Communication Bus G carries excessive voltage, from a short to battery or another supply. No manufacturer documents U008D publicly. On a high-speed CAN this concerns CAN-High, and traffic often continues: NXP lists the fault among those that stay hidden unless a transceiver with bus diagnosis catches it, and onsemi saw frames still pass. The repair needs a second look, though. Texas Instruments warns that a bus wire in contact with a 24 V line drives the transceiver's short-circuit current through the terminating resistor and can burn out a 1/4 W part. After removing the short, measure the resistance between CAN-High and CAN-Low again; about 120 instead of 60 ohms means one terminator, often inside a module, has been damaged.

Likely causes

(+) wire of Bus G touching a battery or 24 V feed
Water in a connector linking the bus to a supply pin
Terminating resistor damaged by an earlier short

Symptoms

  • Often no symptom, code found during a scan
  • Sporadic dropouts on Bus G after a wiring fault

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 g wiringcan terminating resistor

Related codes

U0089U008CU0090U0096

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