Possible causes

-Fault in the throttle position (TP) sensor circuit for the throttle unit.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Lack/Loss of power
– Engine rough idle

P0068 VOLVO Description

Diagnostic trouble code (DTC) P0068 will set if the engine control module (ECM) registers, when the ignition is switched on, and other codes for the throttle position sensor are set.