This bulletin applies to 2016 Acura RLX AWD vehicles where multiple indicators are on or the transmission won’t go into gear, and the MIL is on with automatic transmission DTC P26C3 (internal control module transmission range sensor performance).
There may be debris in the Reverse or Neutral shift buttons of the shift-by-wire (SBW) shifter assembly that’s causing them to stick. Typical debris are particles in the Reverse shift button or sticky residue in the Neutral shift button from something that spilled.
1. Check for debris in either shift button. If you find particles in the Reverse shift button, pull it back and remove them with either a vacuum or a pair of tweezers. If you find sticky residue in the Neutral shift button, remove the residue with a clean cloth dampened with fresh water.
2. If you do not find debris in either shift button, with the engine off, work each button of the SBW shifter assembly one at a time. If any shift button is hard to depress, slow to return or does not fully return, replace the SBW shifter assembly.
3. If the SBW shift assembly is replaced, clear the DTC, start the engine, and with the parking brake set and the brake pedal depressed, work the Park, reverse, Neutral and Drive shift buttons one at a time, waiting 15 seconds between each gear change. Then repeat this three more times and wait 2 minutes before shutting the engine off. If the DTC does not reset and the transmission shifts normally, you’re done.