C1123: Vehicle Speed Sensor Input Short to Battery
MediumChassisChassis Electronics
What does C1123 mean?
C1123 is a diagnostic trouble code indicating "Vehicle Speed Sensor Input Short to Battery". A sensor in the chassis electronics is reporting abnormal data or has lost communication with the ECU. Sensors can fail due to age, contamination, heat exposure, or wiring issues.
Symptoms you may notice
- Check engine light (MIL) illuminated on dashboard
- Intermittent warning lights
- Erratic gauge readings
Estimated repair cost
Typical range in Australia (parts + labour)
$120 – $450 AUD
Common causes
- Faulty chassis electronics component
- Wiring or connector issue in the related circuit
- Failed sensor providing incorrect readings
- Software/calibration issue requiring ECU update
- Related component causing secondary fault
What should you do?
Schedule a diagnostic appointment at your earliest convenience. The vehicle is generally safe to drive short distances, but the underlying issue should be addressed to prevent it from worsening.
Get a diagnosis for YOUR car
Code C1123 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.