J1939 Wiring Mistakes: How Incorrect Termination Costs You $3,000 in ECU Repairs
A fleet in Houston went through three ECUs on a 2021 Class 8 tractor over eighteen months. Dealer diagnostics blamed “electronics failure” each time — no root cause identified. Total parts cost hit $3,000 before they started tracking the pattern: every failure followed the installation of a liftgate controller tied into the J1939 network. When we pulled the […]