Buick Regal: DTC P158A

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 P158A

Cruise Control Calibration Incorrect

Circuit/System Description

For an overview of the component/system, refer to:Cruise Control Description and Operation (Without Adaptive Cruise Control) or Cruise Control Description and Operation (With Adaptive Cruise Control).

Conditions for Running the DTC

• Ignition/Vehicle=On
• Vehicle Speed.=Greater than 40 km/h (25 MPH)
• Cruise Control=On

Frequency the DTC runs=Continuously - After the running conditions are met - For greater than 5 s

Conditions for Setting the DTC

Engine Control Module Configuration Status in BCM=Cruise Control Configuration Mismatch

Actions Taken When the DTC Sets

• Cruise Control System Status=Disabled
• 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

Schematic Reference

Cruise Control Wiring Schematics

Connector End View Reference

Component Connector End View Index

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References

Circuit/System Verification

1. Ignition - On / Vehicle - In Service Mode.

2. Verify there are no other DTCs set, except for DTC P158A.

• If any other DTCs are set
• Refer to:Diagnostic Trouble Code (DTC) List - Vehicle
• Go to next step: If no other DTCs are set

NOTE: During the programming procedure, follow the Service Programming System (SPS) prompts for the correct ignition switch position.

3. Reprogram ECU - - K9 Body Control Module & K20 Engine Control Module.

4. Operate the vehicle within the Conditions for Running the DTC. - Verify the DTC does not set.

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

5. All OK.

Repair Instructions

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

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

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