U0109:code 2015 Chevrolet Camaro
Vehicle runs and drives 100% , check engine light on can not communicate with fuel pump control module . Have ohmed out and continuity tested all four wires, we are at wits end chasing tan and tan and black high speed can wires. We are usually very good at these type of issues but this one has us stumped. Car had damage on passenger side door looking for broken or chafed wires been all over all GM diagrams still no answers
The descriptor for U0109 changes depending on model year, U0109 for 2013 and prior Camaro should read "Lost Communication with Fuel Pump Control Module". U0109 for 2014 and beyond should read " Lost Communication with Chassis Control Module".
Actually it does read Chassis Control Module when trying to communicate with pass through 4 I could not reach so through dlc it cannot be communicated.
Were you able to scope the data network lines at the module ?
We did not what seemed as a much more straight forward loss of communication due to a wiring issue became much deeper we will in the morning. We started chasing the rabbit down the hole and kept following. Time to look with a fresh eye.
KOEO/KOER measure voltage at PINS 5,6,17, and 18 K38 Chassis Control Module.
Voltage pin 5 2.8, 6 2.8, … koer 8 is 11.5