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Home >> Chrysler >> 2011 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1639 (66RFE Automatic Transmission - DTCS P0871 To U1449 - 2500 Hd) >> DTC Troubleshooting >> U0100-Lost Communication With The ECM/Pcm >> When Monitored

When Monitored

WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

Ignition on time is greater than one second.

Battery voltage between 9 and 16 volts.

Engine run time greater than three seconds.

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