OBDII Chevrolet Code Definitions Be sure to double check the codes Anything P1000 to P1999 or P3000 to P3400 will be Manufacturer specific and may not match the ones listed here Check specific manufacturer pages on the site, as some of them, we list the OBD2 codes on those pages for those specific vehiclesThe following TSBs of Chevrolet are related to DTC U0121 07 Chevrolet Avalanche ABS Control Unit and Module TSB Details 07 Chevrolet Avalanche Electronic Limited Slip Control Unit and Module TSB Details 07 Chevrolet Avalanche 1500 ABS Control Unit and Module TSB Details 07 Chevrolet Avalanche 1500 Electronic Limited Slip darmoyan917 Hey guys, i got a 17 Silverado with 62L Gas V8 ECM keeps throwing U Lost communication with device on LIN bus I've checked everything on this damn truck with no luck I looked over the wiring diagram and the ECM doesn't even have LIN bus connection I've already replaced the ECM with a new one from dealer
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