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B3133 Buick Code - All Door Unlock Circuit High

Quick Answer

The outputs to the door lock actuators are controlled by the Body Control Module (BCM). Common causes include Faulty Inoperative Door Lock Actuator, Inoperative Door Lock Actuator harness is open or shorted, Inoperative Door Lock Actuator circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B3133 Buick indicates All Door Unlock Circuit High.
Common causes
Common causes include Faulty Inoperative Door Lock Actuator, Inoperative Door Lock Actuator harness is open or shorted, Inoperative Door Lock Actuator circuit poor electrical connection.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code Popularity 466
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Mar 04, 2020
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Code B3133 Buick Description

The outputs to the door lock actuators are controlled by the Body Control Module (BCM). When the BCM receives a lock input from a door lock switch, or a keyless entry transmitter, it applies battery positive voltage to the door lock actuator lock control circuit, a ground to the door lock actuator unlock control, and the driver door lock actuator unlock control circuits. When the BCM receives an unlock input from a door lock switch, it applies battery positive voltage to the door lock actuator unlock control, the driver door lock actuator unlock control circuits, and a ground to the door lock actuator lock control circuit. When the BCM receives an single Unlock input from a keyless entry transmitter, it applies battery positive voltage to the driver door lock actuator unlock control circuit and a ground to the door lock actuator lock control circuit to unlock the driver door. A second Unlock input from the transmitter applies battery positive voltage to the door lock actuator unlock control circuit, and a ground to the door lock actuator lock control circuit to unlock the passenger doors.
OBDII Code B3133 Buick - All Door Unlock Circuit High - AutoCodes.com
B3133 Buick Code - All Door Unlock Circuit High
What does this mean?

What are the Possible Causes of the DTC B3133 Buick?

  • Faulty Inoperative Door Lock Actuator
  • Inoperative Door Lock Actuator harness is open or shorted
  • Inoperative Door Lock Actuator circuit poor electrical connection
  • Faulty Body Control Module (BCM)

How to Fix the DTC B3133 Buick?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3133 Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B3133 Buick Code

1. What does the OBDII code B3133 mean on a Buick?

Code B3133 indicates an issue with the "All Door Unlock Circuit High," meaning there’s a problem with the electrical circuit responsible for unlocking all doors.

2. What are common symptoms of code B3133 on a Buick?

Symptoms may include failure to unlock all doors, inconsistent door lock behavior, or a malfunctioning key fob or central locking system.

3. What causes the B3133 code to appear on a Buick?

Common causes include a faulty door lock actuator, damaged wiring or connections in the unlock circuit, or a malfunctioning body control module (BCM).

4. Can a weak battery cause the B3133 code on a Buick?

Yes, a weak or failing battery can lead to electrical issues, including triggering the B3133 code.

5. How do you diagnose the B3133 code on a Buick?

Diagnosis involves checking the wiring and connectors in the door unlock circuit, testing the door lock actuators, and scanning the BCM for additional codes.

6. Is it safe to drive with the B3133 code on a Buick?

Yes, it’s generally safe to drive, but you may experience inconvenience due to door lock system malfunctions.

7. How can the B3133 code be fixed on a Buick?

Repairs may include replacing a faulty door lock actuator, repairing damaged wiring, or reprogramming or replacing the BCM if necessary.

8. Can the B3133 code clear itself on a Buick?

The code may clear temporarily if the issue is intermittent, but the problem needs to be resolved to prevent it from returning.

9. Does the B3133 code affect all doors on a Buick?

Yes, this code specifically relates to the circuit responsible for unlocking all doors, not just one.

10. What tools are needed to troubleshoot the B3133 code on a Buick?

You’ll need an OBDII scanner, a multimeter for testing electrical circuits, and potentially wiring diagrams for the vehicle’s door unlock system.

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