The TRS, Transmission Range Sensor does the job of a reverse switch and lives with the solenoid pack in the tranny, the shifter sends it a message and the TRS talks to the PCM and BCM which turns on the reverse lights, so could be a bad connection on the shifter, possibly an earth.
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2015 WK2 CRD Laredo( ZG, WG 2.7 )
Your Never Too Old To Learn Something Stupid.
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