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!

Network generic or reserved

U3002

Vehicle Identification Number

The control module reports a problem with the stored Vehicle Identification Number (VIN) — missing, mismatched between modules, or invalid format.

SystemNetwork
Typegeneric or reserved
GroupU3
Range / number– / 02

Possible causes

  • VIN mismatch after module replacement high
  • VIN not programmed in replacement module medium
  • Gateway module routing CAN messages incorrectly low

Symptoms

  • Multiple warning lights may illuminate
  • Affected modules may go into limp mode or shut down
  • Specific functions inoperative depending on module
  • Diagnostic tools may show communication faults

Inspection / repair

  • Difficulty: medium
  • DIY: shop recommended
  • Estimated cost: 50–400 €
  • Estimated time: 0.5–2 h
  • Component: control module
  • Component: module eeprom
  • MIL / check engine light

Sources

References

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