Chevrolet Silverado / GMC Sierra. Manual — part 2791
of electromagnetic interference that may result from installation of aftermarket equipment
Reference Information
Schematic Reference
Trailer Brake Control Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Trailer Brake Controls Description and Operation
Electrical Information Reference
Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
Scan Tool Reference
Control Module References for Scan Tool Information
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for TBCM replacement, setup, and programming
DTC C056D OR C056E
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
2008 Chevrolet Silverado 1500
2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
C056E
The TBCM is not programmed.
Action Taken When the DTC Sets
The trailer brake control will be disabled at the end of the current brake apply for the
remainder of the ignition cycle.
The Service Trailer Brake System will be displayed on the Driver Information Center
(DIC).
Conditions for Clearing the MIL/DTC
When the condition for the DTC is no longer present.
The TBCM automatically clears the history DTC when a current DTC is not detected in 40
consecutive drive cycles.
Reference Information
Schematic Reference
Trailer Brake Control Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
Scan Tool Reference
Control Module References for Scan Tool Information
Circuit/System Verification
Ignition ON, observe the DTC information with a scan tool. DTC C056D and DTC C056E,
should not set.
2008 Chevrolet Silverado 1500
2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
If DTC C056D failed this ignition, replace the TBCM.
If DTC C056E failed this ignition, program the TBCM.
Circuit/System Testing
C056E
Program the TBCM. If DTC C056E sets after programming, perform the following steps:
If DTC C056D is set, turn off the ignition, wait 30 seconds, turn ignition on, if DTC C056D
failed this ignition cycle, replace the TBCM.
If DTC C056E is set, turn off the ignition, wait 30 seconds, turn ignition on, if DTC C056E
failed this ignition cycle, program the TBCM.
If DTC C056E sets after programming, replace the TBCM.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for TBCM replacement, setup, and programming
DTC C0800
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provide an overview of each diagnostic category.
DTC Descriptor
DTC C800 03
Device Power Circuit Voltage Below Threshold
DTC C800 07
Device Power Circuit Voltage Above Threshold
Circuit/System Description
2008 Chevrolet Silverado 1500
2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
The trailer brake control module (TBCM) monitors the system voltage (ignition voltage) to make
sure that the voltage stays within the proper range. Damage to components, and incorrect data
input can occur when the voltage is out of range. The TBCM monitors the system voltage over an
extended length of time. If the TBCM detects a system voltage outside an expected range, DTC
C0800 will set.
Conditions for Running the DTC
The ignition is ON.
The engine speed is greater than 400 RPM.
Conditions for Setting the DTC
C0800 03
During initialization or when the system is inactive, the system voltage is less than 10.5
volts.
During the system operation, the system voltage is less than 9.5 volts.
C0800 07
Ignition is in RUN.
The system voltage is greater than 17 volts.
Action Taken When the DTC Sets
The trailer brake control will be disabled at the end of the current brake apply for the
remainder of the ignition cycle.
The Service Trailer Brake System will be displayed on the Driver Information Center
(DIC).
Conditions for Clearing the MIL/DTC
When the condition for the DTC is no longer present.
The TBCM automatically clears the history DTC when a current DTC is not detected in 40
consecutive drive cycles.
Reference Information
Schematic Reference
Trailer Brake Control Schematics
2008 Chevrolet Silverado 1500
2008 BRAKES Trailer Brake Controls - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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