U1040 Diagnostic Trouble Code Discussion for October 2017
Lost Communication With Antilock Brake System Module
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| Help Request | Posted | |
| 2001 Chevrolet Impala LS 3.8L MIL Lamp on VIN: 2G1WH55K31 U1040: Loss of Electronic Brake Controller Communication. On the class 2 wire at the DLC voltage is fluctuating from 1 to 5 volts with key on engine running. resistance is 2.8 mohms key off. I've dropped BCM out but its hard to test at the connector with it plugged in. I can clear codes, drive it and in a 1/4 of a mi... |
October 04, 2017 |
