DTC C1928: Engine Torque. No Data, Bus from Trionic: Conditions
WARNING: This page is about a different car, the 2001 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.
The engine is running
Faulty information on the bus regarding throttle position from Trionic
Information from Trionic incorrect or absent. Read DTCs in Trionic.