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.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Battery
- Alternator
- Power supply wiring
- Chassis control module
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Battery weak or discharged
- Alternator output fault
- High-resistance ground or supply connection
Possible symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.