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!

Chassis generic / SAE

C0800

Drive System Voltage Low

The chassis control module has detected that the supply voltage is below the operating threshold required for ABS, ESP or steering systems. Many chassis functions are limited or disabled until the voltage returns to a normal range.

SystemChassis
Typegeneric / SAE
GroupC0
Range / number8 / 00

Possible causes

  • Battery weak or discharged high
  • Alternator output fault medium
  • High-resistance ground or supply connection low

Symptoms

  • ABS warning light on
  • ESC/stability control deactivated
  • Possible reduced brake assist
  • Speedometer may behave erratically

Inspection / repair

  • Difficulty: medium
  • DIY: possible
  • Estimated cost: 50–800 €
  • Estimated time: 0.3–3 h
  • Component: battery
  • Component: alternator
  • Component: power supply wiring
  • Component: chassis control module

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