Electrical failure in the high side aux heater relay supply
â–¶ How to fix
Check cables and connectors Replace relay Engine restart may be required to reset fault code.
What you'll see
Valve 1 cannot be opened, DTC1012 (Electrical failure in valve 1 solenoid) may also be triggered.
System reaction
Amber engine warning lamp
Diagnostic depth
Detection
The GSC is detecting an electrical failure in the high side aux heater relay
Possible cause
Component: RXXX(gas aux heater high side relay), Failure type: Component internal failure, Priority: 1 Component: RXXX(gas aux heater high side relay), Failure type: Open load, Priority: 2 Component: RXXX(gas aux heater high side relay), Failure type: Short circuit ground, Priority: 2 Component: RXXX(gas aux heater high side relay), Failure type: Short circuit battery, Priority: 3