Possible causes

– Faulty Viscous/Cabin Heater Relay
– Viscous/Cabin Heater Relay harness is open or shorted
– Viscous/Cabin Heater Relay circuit poor electrical connection

When is the code detected?

The ECM has detected an excessive current condition on the Viscous/Cabin Heater Relay control circuit

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)