DTC U1100: Powertrain Control Module Time-Out (Related To Engine) DTC U1101: Powertrain Control Module Time-Out (Related To A/T): Notes
WARNING: This page is about a different car, the 2004 Mitsubishi Galant. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
If DTC U1100 or U1101 is set in the combination meter, always diagnose the CAN bus lines.
CAUTION:
Whenever the ECU is replaced, ensure that the communication circuit is normal.