What does the U0159 fault code on the Buick Excelle mean?

[Petunia]

The meaning of the Buick Excelle fault code U0159 is a communication loss with the Parking Assist Control Module A. The reasons for the engine fault light being on are as follows: 1. Exhaust emissions not meeting standards: Poor fuel quality, failure of the three-way catalyst, excessive carbon buildup in the intake manifold, clogged fuel injectors, faulty oxygen sensors, or occasional engine misfires can all cause the engine fault light to illuminate. 2. Poor engine system performance leading to the fault light: Faults or poor contact in sensors such as the throttle position sensor, throttle position sensor, air flow meter, or crankshaft position sensor can also cause the engine fault light to illuminate.