OBD-II reference

All 9.533 generic OBD-II codes, explained in detail.

Causes, inspection steps and sources — a comprehensive DIY archive. Created and maintained with love for the detail. Good luck and have fun!

Body generic / SAE

B0237

Backup Lamp Circuit

The body control module has detected a fault in the backup (reverse) lamp circuit. The lamp does not match the commanded state when reverse gear is engaged.

SystemBody
Typegeneric / SAE
GroupB0
Range / number2 / 37

Possible causes

  • Bulb burned out high
  • Reverse switch failed medium

Symptoms

  • Warning light or symbol related to the affected system
  • Comfort or safety function impaired

Inspection / repair

  • Difficulty: easy
  • DIY: possible
  • Estimated cost: 10–150 €
  • Estimated time: 0.2–1 h
  • Component: backup lamp
  • Component: reverse switch
  • Component: body wiring harness

Sources

References

sae:J2012

How to read OBD-II codes

The first letter names the vehicle system, the second digit distinguishes generic from manufacturer-specific, the remaining digits group fault area and number.

PPowertrain: engine, transmission, emissions
BBody: chassis trim, comfort, interior
CChassis: suspension, brakes, steering
UNetwork: CAN, control modules, communication