DTC P1231: Throttle Position Sensor 1 and 2 Circuit. Sum Out of Range (No Limp Home).: Purpose

WARNING: This page is about a different car, the 2003 Saab 9-3 and 2002 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.

The purpose of this DTC is to report if sporadic surging occurred at constant speed and/or if idling is uneven. The surge can occur relatively seldom and feel like driving over minor unevenness in the road. In the worst cases, the surge may seem like rapid, brief loss of engine power, which can generate suspicion that the ignition discharge module is faulty.

NOTE: The surge must not be confused with the surges that can occur when the engine is heavily loaded.