C0800: Drive System Voltage Low
Standardized SAE J2012 code · C08xx codes
Safety-critical system. Faults in airbags, brakes, steering or high-voltage components can put people at risk. Follow the manufacturer's service information and safety procedures, or have the vehicle checked by a qualified workshop.
What does C0800 mean?
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.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Common causes
- High Battery weak or discharged
- Medium Alternator output fault
- Low High-resistance ground or supply connection
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of C0800 on the same make and model first.
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