Buick Regal: DTC P15F6

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 P15F6

Front Object Detection Control Module Torque Request Signal Message Counter Incorrect.

Circuit/System Description

The active safety control module is constantly sending a serial data message to the engine control module requesting engine speed or torque reduction. The engine control module sets DTC P15F6 when it detects a discrepancy in the structure of the message causing the integrity of the message to be questioned. An intermittent fault in the serial data circuits will cause the engine control module to set DTC P15F6.

Conditions for Running the DTC

Engine running.

Conditions for Setting the DTC

The engine control module detects that the engine speed and torque modification messages from the active safety control module are either corrupted or intermittently missing.

Action Taken When the DTC Sets

• The active safety control module sends a serial data message to display the appropriate indicator message
• The active safety control module features are unavailable.

Conditions for Clearing the DTC

• The condition for the DTC is no longer present.
• The engine control module clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Reference Information

Schematic Reference

Driver Assistance Systems Wiring Schematics

Connector End View Reference

Master Electrical Component List

Description and Operation

Active Safety System 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

NOTE:

• DTC P15F6 is an informational DTC.
• Diagnose all other K20 Engine Control Module DTCs prior to DTC P15F6.

1. Verify there are no other K20 Engine Control Module or communication DTCs set.

• If a DTC is set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle

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

2. Complete the diagnosis by looking for an intermittent serial data circuit fault. Refer to Scan Tool Does Not Communicate with High Speed GMLAN Device.

• If an intermittent serial data circuit fault is found

Repair as necessary.

• Go to next step: If an intermittent serial circuit fault is not found

3. Clear DTCs and operate the vehicle in the conditions that the customer experienced.

4. Verify DTC P15F6 does not set.

• If the DTC sets

Replace K124 Active Safety Control Module

• Go to next step: If the DTC does not set

5. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for active safety control module replacement, programming, and setup.

DTC P15F7

Diagnostic Instructions

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

DTC Descriptor

DTC P15F7

Rear Object Detection Control Module Torque Request Signal Message Counter Incorrect

Symptom Byte Information: Symptom Byte List.

Circuit/System Description

Conditions for Running the DTC

The vehicle speed is greater than 1 km/h (1 MPH).

Conditions for Setting the DTC

The engine control module detects that the engine speed and torque modification messages from the rear parking assist control module are either corrupted or intermittently missing.

Action Taken When the DTC Sets

• The rear parking assist control module sends a serial data message to display the appropriate indicator message
• The rear parking assist control module features are unavailable.

Conditions for Clearing the DTC

• The condition for the DTC is no longer present.
• The engine control module clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Reference Information

Schematic Reference

Driver Assistance Systems Wiring Schematics

Connector End View Reference

Master Electrical Component List

Description and Operation

Parking Assist Description and Operation (UD7) Parking Assist Description and Operation (UD5)

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

NOTE:

• DTC P15F7 is an informational DTC.
• Diagnose all other K20 Engine Control Module DTCs prior to DTC P15F7.

1. Verify there are no other K20 Engine Control Module or communication DTCs set.

• If a DTC is set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle

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

2. Complete the diagnosis by looking for an intermittent serial data circuit fault. Refer to Scan Tool Does Not Communicate with High Speed GMLAN Device.

• If an intermittent serial data circuit fault is found

Repair as necessary.

• Go to next step: If an intermittent serial circuit fault is not found

3. Clear DTCs and operate the vehicle in the conditions that the customer experienced.

4. Verify DTC P15F7 does not set.

• If the DTC sets

Replace the appropriate component: K182 Parking Assist Control Module

• Go to next step: If the DTC does not set

5. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for control module replacement, programming, and setup.

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