Buick Regal: DTC P0571
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 P0571
Cruise Control Brake Switch Circuit
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)
- The K20 sends a serial data message to the K9 indicating the B22 function that has been requested.
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
Cruise Control Switch Signal=Invalid Serial Data
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
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 P0571.
- If any other DTCs are set
Refer to:Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If no other DTCs are set
3. Replace the component:K20 Engine Control Module.
4. Operate the vehicle within the Conditions for Running the DTC. - Verify the DTC does not set.
- If DTC P0571 is set
Replace the component:K9 Body Control Module
- 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.
READ NEXT:
DTC P0572 or P0573
Diagnostic Instructions
Perform the Diagnostic System Check prior to using this diagnostic
procedure: Diagnostic
System Check - Vehicle
Review the description of Strategy Based Diagnosis:Strateg
DTC P0575
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
DTC P0703
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
SEE MORE:
Exterior Lamp Controls
The exterior lamp control is on the
instrument panel to the left of the
steering column.
There are four positions.
: Turns the exterior lamps off and
deactivates the AUTO mode. Turn
to again to reactivate the
AUTO mode.
In Canada, the headlamps will
automatically reactivate when the
vehicle is
Keys
Warning:
Leaving children in a vehicle with
a Remote Keyless Entry (RKE)
transmitter is dangerous and
children or others could be
seriously injured or killed. They
could operate the power windows
or other controls or make the
vehicle move. The windows will
function with the RKE transmitter
in the ve
