'04 Trailblazer. I went to put it in reverse from drive, the shifter moved into reverse position, but the indicator showed still in drive. I shut it off, but couldn't get it restart as the indicator still showed it in drive. Had it towed to the nearest dealer.
The transmission range (TR) switch is part of the park/neutral position (PNP) and backup lamp switch assembly, which is externally mounted on the transmission manual shaft. The TR switch contains four internal switches that indicate the transmission gear range selector lever position. The powertrain control module (PCM) supplies ignition voltage to each switch circuit. As the gear range selector lever is moved, the state of each switch may change, causing the circuit to open or close. An open circuit or switch indicates a high voltage signal. A closed circuit or switch indicates a low voltage signal. The PCM detects the selected gear range by deciphering the combination of the voltage signals. One of these circuits it what is causing your problem but I hope this helps you understand some.
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