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 / SAE

P00FF

Body Control Module Requested MIL Illumination

The Body Control Module (BCM) sent a request to the engine ECU to illuminate the MIL — actual fault is in a body system; this is a forwarded request, not a powertrain fault.

SystemNetwork
Typegeneric / SAE
GroupP0
Range / number– / FF

Possible causes

  • Underlying BCM fault — read BCM codes high

Inspection / repair

  • Difficulty: medium
  • DIY: possible
  • Estimated cost: 80–800 €
  • Estimated time: 0.3–4 h
  • Component: body control module
  • Component: can bus
  • 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