Stabilirak Off, Traction Control Off, Engine Light On, Into limp Mode - In that order, while driving

[Joseph Garcia]

This has happened to me twice in a row (once on the highway, and once in city traffic), and I'm looking for suggestions regarding identifying root cause, or troubleshooting suggestions from the knowledgeable folks here on the Forum. Between the first and second failures, I replaced the batteries, so that potential cause has already been ruled out.

Here is the situation and trouble codes:

2007 yukon xl denali cruising down the road, when the Stabilitrak Off warning starts flashing. Shortly thereafter, the Traction Control Off warning starts flashing, also. Shortly thereafter, the engine warning light comes on, and the truck goes into limp mode. Scanner shows the following trouble codes (No existing trouble codes, prior to this occurrence.)


ECM 8 codes
U0140 - Lost communication with the BCM
U0121 - Lost communication with the ABS control module
U0101 - Lost communication with the TCM
P0700 - TCM requested MIL illumination
U0101 - Lost communication with TCM
U0140 - Lost communication with the BCM
U0100 - Lost communication with the ECM/PCM A
C0242 - PCM indicated TCS malfunction

EBCM 5 codes
U0140 - Lost communication with the BCM
U0121 - Lost communication with the ABS module
U0101 - Lost communication with the TCM
P0700 - tcm requested MIL illumination
U0101 - Lost communication with the TCM


ESC - Electronic Suspension Control Module 3 codes
U0140 - Lost communication with the BCM
U0121 - wasp communication with the ABS module
U0101 - Lost communication with the TCM


TCM 2 codes
U0140 - Lost communication with the BCM
U0121 - Lost communication with the ABS module


BCM 1 code
U0140 - Lost communication with the BCM


Rollover Sensor 1 code
U0140 - Lost communication with the BCM