Buick Regal: DTC C0750, C0755, C0760, or C0765
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 C0750 03
Left Front Tire Pressure Sensor Low Voltage
DTC C0750 29
Left Front Tire Pressure Sensor Too Few Pulses
DTC C0750 39
Left Front Tire Pressure Sensor Internal Malfunction
DTC C0755 03
Right Front Tire Pressure Sensor Low Voltage
DTC C0755 29
Right Front Tire Pressure Sensor Too Few Pulses
DTC C0755 39
Right Front Tire Pressure Sensor Internal Malfunction
DTC C0760 03
Left Rear Tire Pressure Sensor Low Voltage
DTC C0760 29
Left Rear Tire Pressure Sensor Too Few Pulses
DTC C0760 39
Left Rear Tire Pressure Sensor Internal Malfunction
DTC C0765 03
Right Rear Tire Pressure Sensor Low Voltage
DTC C0765 29
Right Rear Tire Pressure Sensor Too Few Pulses
DTC C0765 39
Right Rear Tire Pressure Sensor Internal Malfunction
Circuit/System Description
The tire pressure monitor system has a radio frequency (RF) transmitting
pressure sensor in each wheel/tire
assembly. As vehicle speed increases, centrifugal force puts the sensor into
Drive mode. The sensors send the tire
pressure data to the remote control door lock receiver (RCDLR) which in turn
translates the received sensor data into
sensor presence, sensor mode, and tire pressure before passing it onto the body
control module (BCM). Once vehicle
speed is greater than 40 km/h (25 MPH), the BCM waits for the first sensor to go
into Drive mode, then checks if all
sensors have gone into Drive mode. If one or more sensors does not go into these
modes, or does not transmit at all,
the BCM will set DTC C0750, C0755, C0760, or C0765 respectively.
Conditions for Running the DTC
Vehicle speed is greater than 40 km/h (25 MPH).
Conditions for Setting the DTC
- A sensor does not transmit or transmits invalid data to the BCM.
- A sensor low battery condition.
Action Taken When the DTC Sets
- The tire pressure monitor system indicator icon on the instrument
cluster flashes for 1 min and then remains
illuminated after the ignition switch is cycled ON and the instrument
cluster bulb check is complete.
- If equipped, the driver information center displays a service tire
monitor type message.
Conditions for Clearing the DTC
A current DTC will clear when the malfunction is no longer present and one
ignition cycle occurs.
Diagnostic Aids
- Some aftermarket wheel valve stem holes are located further from the
wheel rim than original equipment
wheels. When using the tire pressure monitor special tool to activate a
sensor, ensure the tool is placed along
the tire sidewall and no further than 15 cm (6 in) from the sensor and the
antenna is aiming upward.
- Aftermarket wheel valve system locations can cause a sensor to not
function correctly.
- A sensor may have been damaged due to a previous wheel/tire service or
flat tire event.
- The use of other than GM approved tire sealants can obstruct the sensor
pressure sensing port and cause
inaccurate tire pressure readings. If this condition is verified, remove the
sealer from the tire and replace the
sensor.
- Occasionally sensor transmissions are not received by the BCM due to
vehicle level radio frequency
interference from items such as but not limited to aftermarket ignition
systems, DVD players, CB radios, or
metallic type window tinting.
- The sensor activation procedure may have to be repeated up to 3 times
before determining a sensor is
malfunctioning. In the event a particular sensor information is displayed on
the special tool upon activation
but the horn does not chirp, it may be necessary to rotate the wheel valve
stem to a different position due to
the RF signal being blocked by another component.
- Occasionally sensors can become mislocated due to previous tire
rotations where the sensor learn procedure
was not performed. Always learn the sensors to ensure the DTC set is for
that actual physical corner of the
vehicle. Refer to Tire Pressure Indicator Sensor Learn.
- A sensor low battery condition will set a sensor DTC but will not
illuminate the low tire pressure indicator or
display a message on the driver information center, if equipped. The sensor
battery condition can be verified in
the scan tool BCM data list. If a sensor low battery condition is indicated
on the scan tool, the sensor will need
to be replaced. Refer to Tire Pressure Indicator Sensor Replacement.
- The Hit Rate of the sensor will help confirm the success rate at which
the sensor transmission is being
received. A low Hit Rate will signal that there may be interference. Refer
to Tire Pressure Rolling Count
Procedure.
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 communication DTCs set along with DTC C0750, C0755,
C0760, and C0765.
- If a communication DTC is set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle.
- Go to next step: If a communication DTC is not set
2. Verify the scan tool Tire Pressure Sensor Rolling Count parameter of all 4
tire pressure sensors is above 50%.
- If the Tire Pressure Sensor Rolling Count parameter is below 50% on
one or more tires
NOTE: When moving the tire pressure sensor to a different location on
the
vehicle, keep the tire pressure sensor with the original tire it is installed
in.
- Move the appropriate tire to a different location on the vehicle and
verify the Tire Pressure Sensor Rolling Count has increased. Refer to Tire
and Wheel Removal and Installation.
- If Tire Pressure Sensor Rolling Count parameter does not increase
after moving tire to different
location, replace the appropriate B2 Tire Pressure Sensor and perform
the Tire Pressure
Indicator Sensor Learn.
- If Tire Pressure Sensor Rolling Count parameter does increase after
moving tire to different
location, check for any aftermarket devices that could be causing
interference to the tire pressure
sensor signal.
- Go to next step: If the Tire Pressure Sensor Rolling Count parameter
is above 50% on one or
more tires
3. Verify if all 4 tire monitor pressure sensor DTCs are not set.
- If 2 or more tire monitor pressure sensor DTCs are set, test the keyless
entry antenna for proper
operation, or if antenna is properly seated. Refer to Keyless Entry System
Malfunction (Active)
Keyless Entry System Malfunction (Passive)
4. Perform the Tire Pressure Indicator Sensor Learn.
5. Verify the scan tool Tire Pressure Sensor Mode parameters change to Drive
while driving the vehicle above 40
km/h (25 mph) for greater than 2 min.
- If a Tire Pressure Sensor Mode parameter does not change to Drive
- Replace the appropriate B2 Tire Pressure Sensor.
- Perform the Tire Pressure Indicator Sensor Learn.
- Go to next step: If the Tire Pressure Sensor Mode parameter changes
to Drive
6. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Tire Pressure Indicator Sensor Replacement
- Tire Pressure Indicator Sensor Learn
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
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
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
SEE MORE:
Special Tools
J-42572 Drive Shaft Seal Clamp Pliers
Disassembly Procedure
1. Front Wheel Drive Half Shaft - Remove
Front Wheel Drive Half Shaft Replacement - Left Side
Front Wheel Drive Half Shaft Replacement - Right Side (AWD)Front
Wheel Drive Half Shaft
Replacement - Right Side (FWD)
2. Pla
Preliminary Procedure
Radiator Replacement (2.0L LTG) or Radiator Replacement (3.6L LGX).
Radiator Lower Bracket
Procedure
Depress the locking tab on the bracket to remove.
RADIATOR LOWER BRACKET REPLACEMENT - RIGHT SIDE
Preliminary Procedure
Radiator Replacement (2.0L LTG) or Radiator Rep