Network, generic

U0092 Vehicle Communication Bus H

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

U0092 stands for Vehicle Communication Bus H as a whole, the eighth network letter in SAE's list. Which network a carmaker files under H is not stated in any public bulletin or OBD table, and no manufacturer documents U0092 itself; the service data of the specific model has to tell. The code reflects CARB's rule that a digital input which stops communicating must be detected and get its own fault code. U0092 does not narrow the fault down; U0093 stands for degraded traffic, U0094 to U009A for single-wire faults and U007A for a module that went bus off. Supply problems can look the same: Nissan observes that below about 10 V modules drop off the bus one by one at different voltages, and that a few main fuses feed many modules at once. Check battery and feeds first.

Likely causes

Wiring or connector fault on Bus H
Weak battery or voltage drop so modules fall off the bus
Blown main fuse or bad feed supplying several Bus H modules

Symptoms

  • Several functions handled by Bus H modules fail together
  • Problems worse at cranking or with a low battery

Repair estimate

DifficultyHardWorkshop job
Parts and labour€50–900
Time0.5–5 h

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

Parts involved

bus h wiringmodule connector

Related codes

U0089U007AU0093U009B

References: law.cornell.edu, static.nhtsa.gov, en.wikipedia.org.