Buick Regal: DTC C0116
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 Descriptors
DTC C0116
Pump Motor Relay Circuit
For symptom byte information refer to Symptom Byte List.
Diagnostic Fault Information
Circuit/System Description
The pump motor is an integral part of the brake pressure modulator valve
assembly, while the pump
motor relay is integral to the electronic brake control module. The pump motor
relay is not engaged
during normal system operation. When the ABS, traction control or stability
control operation is
required, the electronic brake control module activates the pump motor relay and
turns the pump motor
ON.
Conditions for Running the DTC
Ignition ON.
Conditions for Setting the DTC
- The pump motor relay has an internal failure
- The pump motor relay voltage is greater than threshold.
Action Taken When the DTC Sets
- The electronic brake control module disables the ABS, traction control,
stability control and hill
start assist for the duration of the ignition cycle.
- The ABS warning indicator turns ON.
- The traction control/stability control-active indicator turns ON.
Conditions for Clearing the DTC
- A current DTC clears when the diagnostic runs and passes.
- The electronic brake control module will turn OFF the indicators in the
next ignition cycle.
Reference Information
Schematic Reference
Antilock Brake System Wiring Schematics
Connector End View Reference
Component Connector End View Index
Description and Operation
ABS 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.
Circuit/System Verification
1. Ignition ON.
2. Verify that DTC C0110 is not set.
Refer to DTC C0110 to diagnose that DTC prior to this diagnostic.
- Go to next step: If DTC C0110 is not set
3. Replace the K17 Electronic Brake Control Module.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for Electronic Brake Control Module replacement,
programming and
setup.
DTC C0121
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
DTC C0121
Valve Relay Circuit Malfunction
For symptom byte information refer to Symptom Byte List.
Diagnostic Fault Information
Circuit/System Description
The valve relay is an integral part of the electronic brake control module (EBCM),
while the solenoid
valves are integral to the brake pressure modulator valve assembly. The valve
relay is engaged during
normal system operation and provides voltage to the solenoid valves. When the
ABS control operation is
required, the EBCM controls the solenoid valves by providing ground to the
active solenoid valves.
Conditions for Running the DTC
- Vehicle speed is greater than 6 km/h (4 MPH) with the brake pedal not
applied.
OR
- Vehicle speed is greater than 15 km/h (9 MPH) and the brake pedal is not
actuated.
Conditions for Setting the DTC
- The EBCM is requesting valve activation and the relay output voltage is
low.
- The EBCM is not requesting valve activation and the relay output voltage
is B+.
- The EBCM detects 3 or more solenoid valve circuits are open or shorted
during the self-test.
- A malfunction exists within the EBCM.
Action Taken When the DTC Sets
- The EBCM disables the ABS for the duration of the ignition cycle.
- The ABS indicator turns ON.
Conditions for Clearing the DTC
- A current DTC clears when the diagnostic runs and passes.
- The EBCM will turn OFF the indicator and enable the system functions in
the next ignition cycle.
Reference Information
Schematic Reference
Antilock Brake System Wiring Schematics
Connector End View Reference
Component Connector End View Index
Description and Operation
ABS 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
Circuit/System Verification
Ignition ON, command the ABS Solenoid Valves On and Off with the scan tool.
The solenoid valves
should turn ON and OFF.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the K17 Electronic Brake
Control Module
(EBCM).
2. Test for less than 5 Ω between the ground circuit terminals listed below:
- Ground circuit terminal 14 and ground.
- Ground circuit terminal 46 and ground.
- If greater than 5 Ω
Test/repair the ground circuit for an open/high resistance.
- Go to next step: If less than 5 Ω
Go to next step: Replace the K17 Electronic Brake Control Module
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic
procedure.
Control Module References for EBCM replacement, setup and programming.
READ NEXT:
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.
Diag
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.
Diag
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.
Diag
SEE MORE:
The vehicle has a passenger
sensing system for the front
outboard passenger position. The
passenger airbag status indicator
will light on the overhead console
when the vehicle is started.
The words ON and OFF will be
visible during the system check.
When the system check is
complete, either the wo
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.
Refer to Diagnostic Procedure Instructions for an overview of each
diagnostic category.
DTC Descripto