Cooling system failure (low coolant, blocked radiator, or pump failure). Ambient temperature extremes affecting sensor calibration. Faulty temperature sensor providing inaccurate readings.

Note the alert and schedule a diagnostic appointment when convenient. Scan for all DTCs with an OBD-II scanner — note any related codes stored alongside B2463. Check coolant level, coolant flow, and cooling fan operation.

B2463

Caution

Aux Heater Overheat Fault

Severity

Caution

What does B2463 mean?

B-code B2463 means "Aux Heater Overheat Fault". It is a generic OBD-II diagnostic trouble code (DTC) in the body electronics. An abnormal temperature condition has been detected in the aux heater overheat fault — the system may be overheating or running too cold. This code can be monitored, but service is recommended to prevent escalation. This code applies to OBD-II compliant electric and hybrid vehicles.

Possible Causes

Cooling system failure (low coolant, blocked radiator, or pump failure)
Ambient temperature extremes affecting sensor calibration
Faulty temperature sensor providing inaccurate readings
Thermal management system component failure

Recommended Actions

1 Note the alert and schedule a diagnostic appointment when convenient
2 Scan for all DTCs with an OBD-II scanner — note any related codes stored alongside B2463
3 Check coolant level, coolant flow, and cooling fan operation
4 Inspect the temperature sensor and its wiring for damage or corrosion
5 Clear the DTC, road-test the vehicle, and re-scan to confirm whether the fault returns
6 If the fault persists after inspection and clearing, consult an EV-certified technician for component replacement

Related Body fault codes

B1200 Climate Control Pushbutton Circuit Failure B1201 Fuel Sender Circuit Failure B1202 Fuel Sender Circuit Open B1203 Fuel Sender Circuit Short To Battery B1204 Fuel Sender Circuit Short To Ground B1205 EIC Switch-1 Assembly Circuit Failure B1206 EIC Switch-1 Assembly Circuit Open B1207 EIC Switch-1 Assembly Circuit Short To Battery