Non start a series of intermittent communication and powertrain faults?

26,879 MILES • AUTOMATIC
Avatar
ANDRIN ATEM
  • MEMBER
  • 414 POSTS
Here is a concise, professionally drafted inquiry to 2CarPros, written from an engineering perspective:
Subject: Request for Network and Powertrain Wiring Diagrams - 2012 BMW X6 xDrive50i (E71 / N63)
Vehicle Information:
• Year/Make/Model: 2012 BMW X6 xDrive50i (E71)
• Engine: 4.4L Twin-Turbo V8 (N63)
• VIN: 5UXFG8C52CL590277
Message:
Hello,
I am currently troubleshooting a series of intermittent communication and powertrain faults on a 2012 BMW X6 xDrive50i. Based on the diagnostic log, I am treating this as a systemic network or module failure rather than isolated component faults.
To proceed with pinout testing, voltage drops, and bus waveform analysis, I require the official factory wiring diagrams for the following fault codes:
1. Network / Bus Faults (Priority 1):
• CDA6 & CDAC: Message timeouts/bus communication breakdown originating from the DME to the Central Gateway Module (ZGM).
• D904: K-CAN line fault / Body CAN bus communication error.
• Required Diagrams: K-CAN and PT-CAN network topologies, including ZGM, JBE, and DME bus interfacing and grounding points.
2. Actuator & Module Faults (Priority 2):
• 2B27: Throttle valve actuator bank 2 initialization error.
• 9CBB: Short circuit fault within the Footwell Module (FRM3).
• Required Diagrams: Throttle valve actuator (Bank 2) circuit to DME, and primary power/ground distribution for the FRM3 module.
Any schematic data regarding shared ground distributions or voltage supply lines common to these specific modules would be highly appreciated.
Thank you for your time and technical assistance.
Best regards.
Oct 24, 2026 at 7:27 PM
Advertisement
Avatar
STRAILER
  • ✓Experienced Mechanic
  • 55,721 POSTS
Hello Andrin,


First of all make sure the battery is in good shape. Did this car have water damage? I would check the floor boards for water. Here is the location for the footwell module, this is where I would start, disconnect the battery and remove the electrical connections to check for corrosion. Also, double check the fuses and look at the wiring grounds under the dash and hood. You can get a rebuilt unit by searching ebay or google. Let me know
Oct 26, 2026 at 9:13 AM
Avatar
ANDRIN ATEM
  • MEMBER
  • 414 POSTS
I you suggesting the unit is faulty? Because I thought I would get diagrams for the Network , for trouble shooting.
Oct 26, 2026 at 11:55 AM
Avatar
STRAILER
  • ✓Experienced Mechanic
  • 55,721 POSTS
The network is large, I would go to this link and print them out.

https://www.alldata.com/diy-us/en

Oct 27, 2026 at 8:07 AM
Avatar
ANDRIN ATEM
  • MEMBER
  • 414 POSTS
Access is denied
Oct 27, 2026 at 11:36 PM
Avatar
STRAILER
  • ✓Experienced Mechanic
  • 55,721 POSTS
You must sign up for it.
Oct 28, 2026 at 7:59 AM
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Frequently Asked Problems for This Vehicle