B2456: Aux Heater Coolant Sensor Circuit Short to Ground
MediumBodyClimate Control
What does B2456 mean?
B2456 is a diagnostic trouble code indicating "Aux Heater Coolant Sensor Circuit Short to Ground". The ECU is detecting a voltage reading that is below the expected range in the climate control circuit. This typically points to a wiring short, a faulty sensor, or a grounding issue.
Common causes
- Damaged or corroded wiring harness
- Loose or disconnected electrical connector
- Failed climate control sensor or actuator
- Blown fuse in the related circuit
- Poor ground connection
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 B2456 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.