Buick Regal: DTC P175F

Diagnostic Instructions

• Perform the Diagnostic System Check prior to using this diagnostic procedure: Refer to Diagnostic System Check - Vehicle
• Review the description of Strategy Based Diagnosis:Strategy Based Diagnosis
• An overview of each diagnostic category can be found here: Refer to Diagnostic Procedure Instructions

DTC Descriptor

DTC P175F

Acceleration Sensor Signal Message Counter Incorrect

Circuit/System Description

Inflatable Restraint Sensing and Diagnostic Module communicates with the electronic brake control module and transmission control module via serial data. The electronic brake control module activates the stability control function depending on the multi-axis acceleration sensor input. The inflatable restraint sensing and diagnostic module uses the multi-axis acceleration sensor to determine if the vehicle is in a roll over or near collision incident.

The transmission control module uses the rate of vehicle acceleration to improve vehicle performance and transmission shift feel. The transmission control module sets this DTC when it detects a discrepancy in the structure of the message, causing the signal message integrity to be questioned.

Conditions for Running the DTC

• DTC U0121 = Not set
• Ignition=On - For greater than 3 s
• Serial Data=Enabled

Frequency the DTC runs=Continuously - After the running conditions are met

Conditions for Setting the DTC

Serial Data=Message Counter Incorrect - Between the following control modules:

• K71 Transmission Control Module
• K17 Electronic Brake Control Module

The above condition (s) must occur 5 times.

Actions Taken When the DTC Sets

DTCs listed in the DTC Descriptor Category=Type C DTC

Conditions for Clearing the DTC

DTCs listed in the DTC Descriptor Category=Type C DTC

Reference Information

DTC Type: Reference

Refer to Powertrain Diagnostic Trouble Code (DTC) Type Definitions.

Scan Tool: Reference

Refer to Control Module: References.

Circuit/System Verification

1. Verify there are no DTCs set related to the following system/component:Serial Data

• If other DTCs are set

Refer to: Diagnostic Trouble Code (DTC) List - Vehicle

• If no other DTCs are set

1. Replace the component:K71 Transmission Control Module
2. Operate the vehicle within the Conditions for Running the DTC.

Verify the DTC does not set.

• If the DTC sets - Replace the component:K17 Electronic Brake Control Module
• Go to next step: If the DTC is not set

3. All OK.

• Go to next step: If no DTC is set

2. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair: Refer to Diagnostic Repair Verification

For control module replacement, programming, and setup: Refer to Control Module: References

DTC P1761

Diagnostic Instructions

• Perform the Diagnostic System Check prior to using this diagnostic procedure: Refer to Diagnostic System Check - Vehicle
• Review the description of Strategy Based Diagnosis:Strategy Based Diagnosis
• An overview of each diagnostic category can be found here: Refer to Diagnostic Procedure Instructions

DTC Descriptor

DTC P1761

Up and Down Shift Switch Signal Message Counter Incorrect

Circuit/System Description

Control modules connected to the serial data circuits monitor the communication during normal vehicle operation.

Operating information and commands are exchanged among the control modules. Each module on the serial data circuit maintains a transmit error counter and a receive error counter. The counter values increase with detected errors and decrease with error-free messages.

Conditions for Running the DTC

• K9 Body Control Module= Communication Enabled
• K71 Transmission Control Module= Communication Enabled
• Ignition Voltage=9 to 32 V

Frequency the DTC runs=Continuously - After the running conditions are met

Conditions for Setting the DTC

Serial Data=Message Counter Incorrect - Between the following control modules:

• K71 Transmission Control Module
• K9 Body Control Module

The above condition (s) must occur 5 times.

Actions Taken When the DTC Sets

• DTCs listed in the DTC Descriptor Category=Type C DTC
• Manual Shift Control=Disabled

Conditions for Clearing the DTC

DTCs listed in the DTC Descriptor Category=Type C DTC

Reference Information

DTC Type: Reference

Refer to Powertrain Diagnostic Trouble Code (DTC) Type Definitions.

Scan Tool: Reference

Refer to Control Module: References.

Circuit/System Verification

1. Verify there are no DTCs set related to the following system/component:Serial Data

• If other DTCs are set

Refer to: Diagnostic Trouble Code (DTC) List - Vehicle

• If no other DTCs are set

1. Replace the component:K71 Transmission Control Module
2. Operate the vehicle within the Conditions for Running the DTC.

   Verify the DTC does not set.

   • If the DTC sets - Replace the component:K9 Body Control Module
   • Go to next step: If the DTC is not set
3. All OK.

• Go to next step: If no DTC is set

2. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair: Refer to Diagnostic Repair Verification

For control module replacement, programming, and setup: Refer to Control Module: References

DTC P1775

Diagnostic Instructions

• Perform the Diagnostic System Check prior to using this diagnostic procedure: Refer to Diagnostic System Check - Vehicle
• Review the description of Strategy Based Diagnosis:Strategy Based Diagnosis
• An overview of each diagnostic category can be found here: Refer to Diagnostic Procedure Instructions

DTC Descriptor

DTC P1775

Transmission Range Request Signal Message Counter Incorrect

Circuit/System Description

For an overview of the component/system, refer to Electronic Component Description

Control modules connected to the serial data circuits monitor the communication during normal vehicle operation.

Operating information and commands are exchanged among the control modules. Each module on the serial data circuit maintains a transmit error counter and a receive error counter. The counter values increase with detected errors and decrease with error-free messages.

Conditions for Running the DTC

• Battery Voltage=9 to 32 V
• Ignition Voltage =9 to 32 V
• No other DTCs related to the concerned component are set.

Conditions for Setting the DTC

Serial Data=Message Counter Incorrect - Between the following control modules:

• K9 Body Control Module
• K71 Transmission Control Module

Actions Taken When the DTC Sets

DTCs listed in the DTC Descriptor Category=Type B DTC

Conditions for Clearing the DTC

DTCs listed in the DTC Descriptor Category=Type B DTC

Reference Information

DTC Type: Reference

Refer to Powertrain Diagnostic Trouble Code (DTC) Type Definitions.

Scan Tool: Reference

Refer to Control Module: References.

Circuit/System Verification

NOTE: DTC P1775 is an informational DTC.

1. Ignition - On / Vehicle - In Service Mode

2. Verify there are no DTCs set related to the following system/component:Serial Data

• If a related DTC is set

Refer to: Diagnostic Trouble Code (DTC) List - Vehicle

• Go to next step: If a related DTC is not set

1. Ignition/Vehicle - Off
2. Replace the component:K71 Transmission Control Module
3. Operate the vehicle within the Conditions for Running the DTC.
4. Verify the DTC does not set.
   • If the DTC sets - Replace the component:K9 Body Control Module
   • Go to next step: If the DTC is not set
5. All OK.
   • Go to next step: If no DTC is set

3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair: Refer to Diagnostic Repair Verification.

For control module replacement, programming, and setup: Refer to Control Module: References.

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