Harsh shifts, limp mode, or no reverse can be the Allison 1000 TCM, not the engine ECM. Here’s how 5-speed and 6-speed TCM symptoms differ from engine faults.
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Harsh shifts, limp mode, or no reverse can be the Allison 1000 TCM, not the engine ECM. Here’s how 5-speed and 6-speed TCM symptoms differ from engine faults.