C056D on Cadillac
Electronic Brake Control Module Internal Fault (manufacturer-specific)
C056D on Cadillac vehicles indicates electronic brake control module internal fault (manufacturer-specific). Au7o has documented this code across 1 Cadillac model — most commonly on XTS. C056D is a manufacturer-specific chassis code (frequently seen on GM vehicles) that generally indicates an internal hardware/electronics failure within the electronic brake control module (EBCM)/ABS assembly. When the module's own self-test detects a fault it cannot recover from, it disables ABS, traction control, and stability control and commonly triggers the 'Service StabiliTrak'/'Service Traction Control' messages. Because the fault is internal to the module, the usual repair is reprogramming or replacing the ABS/EBCM unit after confirming wiring and power/ground are good. Conventional braking still functions while the electronic aids are offline.
Common Causes of C056D
- •Internal EBCM/ABS module hardware failure
- •Corroded or damaged module connector/pins
- •Poor power or ground to the ABS module
- •Low battery voltage or charging system issues
- •Water intrusion/corrosion in the module
- •Module software/calibration corruption
- •Wiring faults at the brake module connector
C056D on Cadillac by Model
Cadillac XTS(1 issue)
- Cold-Start Service Power Steering Message May Require Power, Ground and Software Checks2014-2016
GM PI1294B covers 2014-2016 XTS vehicles with belt-drive electronic power steering RPO NJ2 when a Service Power Steering message appears intermittently after a cold start and C056D 3C, C0475 00 or U0131 is current or stored.
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View C056D across all makes →Frequently Asked Questions
What does C056D mean on Cadillac?▼
C056D stands for "Electronic Brake Control Module Internal Fault (manufacturer-specific)." C056D is a manufacturer-specific chassis code (frequently seen on GM vehicles) that generally indicates an internal hardware/electronics failure within the electronic brake control module (EBCM)/ABS assembly. When the module's own self-test detects a fault it cannot recover from, it disables ABS, traction control, and stability control and commonly triggers the 'Service StabiliTrak'/'Service Traction Control' messages. Because the fault is internal to the module, the usual repair is reprogramming or replacing the ABS/EBCM unit after confirming wiring and power/ground are good. Conventional braking still functions while the electronic aids are offline. On Cadillac specifically, this code is documented across 1 model.
What causes C056D on Cadillac vehicles?▼
Common causes on Cadillac: Internal EBCM/ABS module hardware failure, Corroded or damaged module connector/pins, Poor power or ground to the ABS module, Low battery voltage or charging system issues, Water intrusion/corrosion in the module. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C056D on a Cadillac?▼
Repair costs vary widely depending on the root cause and specific Cadillac model.
Which Cadillac models have C056D documented?▼
Au7o has documented C056D on 1 Cadillac model: XTS.