Network, generic

U0097 Vehicle Communication Bus H (-) Open

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0097 points to an open (-) wire on Vehicle Communication Bus H, CAN-Low if Bus H is a CAN. The code is absent from public manufacturer documents. Effects vary: NXP's fault-tolerant TJA1055 keeps receiving differentially with a broken CANL, while on a high-speed CAN the nodes beyond the break lose part of their signal. Sleep behaviour matters too; NXP designed the wake detection of its TJA1043 so that a broken CAN-Low does not wake the network while it is going to sleep. A car with U0097 should still be checked for battery drain. To locate the break, Nissan advises splitting a harness with inline connectors into sections, testing one at a time and fitting a 120-ohm resistor in place of the terminating module.

Likely causes

Broken (-) wire in the harness
Spread or bent terminal losing contact
Poor earlier repair or splice in the (-) wire

Symptoms

  • Modules beyond the break respond only sometimes
  • Code with little effect on fault-tolerant layouts

Repair estimate

DifficultyHardWorkshop job
Parts and labour€60–700
Time0.5–5 h

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

Parts involved

bus h wiringcan low wire

Related codes

U008EU0094U0098U009A

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