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Selector Fault | Internal TCU Error Code 200A
Backlighting works but gauges do not
We commonly see water ingress
Fault code 200A: Internal fault in control unit
These faults are often traced back to failed or degraded ECU circuitry at key signal pins
Allison T14/A50 Transmission Control Module repair ECU Selector Fault | Internal TCUThe Allison T14 A50 Transmission Control Module (TCM) is a common component in 2009 2015 Chevrolet and GMC trucks with the 6. 6L Duramax engine. These TCMs are known to fail, often due to internal circuit board issues, leading to various transmission problems. A failed TCM can result in messages like "Range Shift Inhibited," "Service Brake System," or "Service Stabilatrak". Other symptoms include erratic shifting, loss of the gear shift indicator, and
