Buick Regal: DTC C0774
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 C0774 00
Tire Pressure Monitoring System
Circuit Description
The electronic brake control module (EBCM) receives a serial data message from the tire pressure monitor (TPM) system when low tire pressure is detected. The EBCM will adjust the responses of vehicle stability enhancement system (VSES) to have optimal vehicle control when active.
Conditions for Running the DTC
- Engine is running.
- Battery voltage is between 9 - 16 V.
- Vehicle speed is greater than 3.6 km/h (2.2 mph).
- DTC runs continuously once the above conditions are met.
Conditions for Setting the DTC
- The tire pressure in any of the tires is below 104 kPa (15.1 psi).
- The compact spare tire is present on the rear axle.
Actions Taken When the DTC Sets
- The ESC will become permanently active.
- No warning indicators and/or messages will be displayed.
Conditions for Clearing the DTC
- The condition for the DTC is no longer present.
- All tires have correct pressures.
Reference Information
Description and Operation
Tire Pressure Monitor Description and Operation
Scan Tool Reference
Control Module References for scan tool information.
Circuit/System Verification
1. Verify there are no TPM DTCs DTC C0750, C0755, C0760, and C0765 set along with DTC C0774.
- If DTC is set
Refer to DTC C0750, C0755, C0760, or C0765.
- If DTC is not set
Verify tire pressure. Refer to Symptoms - Tire Pressure Monitoring.
DTC C0775
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 C0775 00
Tire Pressure Monitoring System Sensors Malfunction
Circuit/System Description
If the body control module (BCM) has been reprogrammed or replaced and the tire pressure sensor learn procedure has not been performed, the tire pressure monitor system indicator icon on the instrument cluster will flash for 1 min and then remain illuminated after the power switch is cycled ON and the instrument cluster bulb check is complete.
If equipped, the driver information center will also display a service tire monitor type message. Under these circumstances, DTC C0775 will be set in the BCM and the tire pressure sensor learn procedure will need to be performed for the system to function correctly.
Conditions for Running the DTC
Vehicle ON or Vehicle in Service Mode.
Conditions for Setting the DTC
The body control module (BCM) has not learned tire pressure sensor ID and location information from the tire pressure sensors.
Action Taken When the DTC Sets
- The tire pressure monitor system indicator icon on the instrument cluster will flash for 1 min and then remain illuminated after the power switch is cycled ON and the instrument cluster bulb check is complete.
- If equipped, the driver information center displays a service tire monitor type warning message.
Conditions for Clearing the DTC
A current DTC will clear when the BCM has received tire pressure sensor ID and location after tire pressure sensor indicator learn procedure has been performed.
Reference Information
Description and Operation
Tire Pressure Monitor Description and Operation
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
1. Perform the Tire Pressure Indicator Sensor Learn.
2. Verify DTC C0775 is not set.
- If the DTC is set
- Test the keyless entry antenna for proper operation. Refer to Keyless Entry System Malfunction (Active) Keyless Entry System Malfunction (Passive).
- Clear DTC.
- Verify DTC does not set.
- If the DTC sets, replace the K9 Body Control Module.
- Go to next step: If the DTC does not set.
- Go to next step: All OK.
Go to next step: If the DTC is not set
3. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for control module replacement, programming, and setup.
READ NEXT:
Symptoms - Tire Pressure Monitoring
1. Perform the Diagnostic System Check - Vehicle, before using the Symptom
Tables in order to verify that all
of the following are true:
The control modules can communicate via the serial data link
Tire Pressure Rolling Count Procedure
Introduction
The Tire Pressure Rolling Count parameter for each sensor can be used to help
confirm if the sensor transmissions
are being received. As the vehicle is being driven, the Tire Pressure Ro
Repair Instructions
Tire Pressure Indicator Sensor Replacement
Removal Procedure
1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the
Vehicle.
2. Remove the tire and wheel assembly.
3. Dismount th
SEE MORE:
Electronic Brake Control Module Replacement
Preliminary Procedure
Electronic Brake and Traction Control Module with Brake Pressure Modulator
Valve
Replacement (2.0L LTG) or Electronic Brake and Traction Control Module with
Brake
Pressure Modulator Valve Replacement (3.6L LGX)
Electronic Brake Control Module Bolt[4x]
CAUTION: Fastener Ca
DTC B154A or B154B
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
DT
