You won't find this information in a Haynes manual ! I know , I work for a GMC dealership , along with Chevy and Cadillac ! this information I'm adding is right out of GMC service information .
DTC Descriptors
Conditions for Clearing the DTC
Diagnostic Aids
Diagnostic Instructions
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Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
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Review Strategy Based Diagnosis for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC C0561 71: System Disabled Information Stored Invalid Serial Data Received
DTC C0561 72: System Disabled Information Stored Alive Counter Incorrect
DTC C0561 74: System Disabled Information Value of Signal Protection Calculation Incorrect
Circuit/System Description
The electronic brake control module (EBCM) receives serial data messages from the body control module (BCM), engine control module (ECM), instrument panel cluster (IPC), and the transmission control module (TCM) which are needed to perform antilock brake system (ABS), vehicle stability enhancement system (VSES), or traction control system (TCS) functions.
Conditions for Running the DTC
Ignition voltage is greater than 10 volts.
Conditions for Setting the DTC
The EBCM receives an invalid serial data message from another module.
Action Taken When the DTC Sets
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The EBCM disables the traction control system (TCS)/ vehicle stability enhancement system (VSES).
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A DIC message and/or a warning indicator may be displayed.
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The condition for the DTC is no longer present.
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The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
This DTC indicates that there are no problems in the EBCM. The BCM, ECM, IPC and the TCM should be checked for a possible fault.
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
ABS Description and Operation
Electrical Information Reference
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Circuit Testing
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
You would need a factory scan tool or equivalent too diagnose this ,not a code reader . So do your self a favor an take to a dealership. I've been doing this for thirty years .
SOURCE: I have no low beams on my 2009 Acadia. Fuses are
could be two blown bulbs or the control switch
DTC Symptom
DTC Symptom Descriptor
71
Invalid Serial Data Received
72
Alive Counter Incorrect/Not Updated
Diagnostic Aids
This DTC is for information only. As an aid to the technician, this DTC indicates that there are no problems in the ABS/traction control system (TCS).
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This is something you'll need to take to the dealer !
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