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Randy, GMC Technician
Category: GM
Satisfied Customers: 9705
Experience:  25 Years experience
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GM yukon denali: What is the black electrical box on driver

Customer Question

What is the black electrical box on driver side of transmission called
Submitted: 2 years ago.
Category: GM
Expert:  Randy replied 2 years ago.
Hi, my name is ***** ***** certified automotive professional with over 25 years experience. I will be glad to assist you with this.
That is the Transmission Range Switch
The Transmission Range (TR) switch is part of the Park/Neutral Position (PNP) and backup light switch assembly, which is externally mounted on the transmission manual shaft. The TR switch contains 4 internal switches that indicate the transmission gear range selector lever position. The 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. PCM compares actual voltage combination of the switch signals to a TR switch combination chart stored in memory.
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Customer: replied 2 years ago.
Can the box be changed out
Expert:  Randy replied 2 years ago.
yes, I have included the removal and installation procedure for you.
Customer: replied 2 years ago.
Ok this is for a 5.3 manual transmission I need a 6.0 automatic transmission.
Expert:  Randy replied 2 years ago.
sorry about that. The 6.0 Auto Transmission link is below.