Conditions for Running The DTC

WARNING: This page is about a different car, the 2007 Saturn Sky. However, it is still accessible from the selected car via links, so may be relevant.

No communication DTC U2106.
Engine speed is 1,800-2,200 RPM.
ECM deceleration fuel shutoff is active.
Engine coolant temperature is greater than 65°C (149°F).
TCM commanded gear is 4th.