By ALLDATA Tech-Assist Team
Here’s a compilation of some of the “Tech Tips” ALLDATA compiles as its Tech-Assist Team helps technicians tackle vehicle issues. More detail on these tips – including marked-up schematics, images and recommendations – are searchable in the “ALLDATA Community” (https://www.alldata.com/alldata-community).
BMW auto-start/stop system inoperative
Problem: The auto-start/stop system on a 2018 BMW X5 (xDrive 40e, AWD, L4-2.0L Turbo, Hybrid) with 115,744 miles was inoperative. The customer stated that they must hold the start button for five seconds for the engine to start.
Details: The technician pulled diagnostic trouble code (DTC) 21A515 – Start system, toothed belt starter: Timeout, automatic engine start-stop function deactivated. Not having a lot of BMW experience, he called ALLDATA Tech-Assist.
The Tech-Assist consultant recommended starting the diagnosis by checking the auxiliary battery first.…
