AutoCodes – Generic – B2940

B2940 Code - Power Liftgate Chime Output Circuit Short To Ground

Quick Answer

The Power Liftgate Chime is controlled by the Liftgate/Trunk Module (LTM). Common causes include Faulty Chime, Chime harness is open or shorted, Chime 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: B2940 indicates Power Liftgate Chime Output Circuit Short To Ground.
Common causes: Common causes include Faulty Chime, Chime harness is open or shorted, Chime 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 1,363

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Feb 13, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2940 Description

The Power Liftgate Chime is controlled by the Liftgate/Trunk Module (LTM). To activate the chime, the LTM supplies a high frequency voltage and ground. If the diagnostic feedback voltage is less than 0.9VDC for PWM duty greater than 80%, the LTM sets this Diagnostic Trouble Code (DTC).

OBDII Code B2940 - Power Liftgate Chime Output Circuit Short To Ground - AutoCodes.com — B2940 Code - Power Liftgate Chime Output Circuit Short To Ground

What does this mean?

What are the Possible Causes of the DTC B2940?

Faulty Chime
Chime harness is open or shorted
Chime circuit poor electrical connection
Faulty Liftgate/Trunk Module (LTM)

How to Fix the DTC B2940?

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 B2940 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.

Need more information about the B2940 code?

Need more information on how to fix the B2940 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2940 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2940 Ford — Power Liftgate Chime Output Circuit Short To Ground
B2940 Lincoln — Power Liftgate Chime Output Circuit Short To Ground
B2940 Mercury — Power Liftgate Chime Output Circuit Short To Ground

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 B2940 Code

1. What does the OBDII code B2940 mean?

B2940 indicates a short to ground in the power liftgate chime output circuit, typically related to the system that alerts you when the liftgate is operating or malfunctioning.

2. What are the common symptoms of the B2940 code?

Symptoms may include the liftgate chime not working, intermittent or non-functional power liftgate operation, and a stored warning code in the vehicleâ€™s ECU.

3. What causes the B2940 code to appear?

The most common causes are damaged wiring, a short to ground in the chime circuit, a faulty liftgate chime module, or a malfunctioning Body Control Module (BCM).

4. Can I still drive my car with the B2940 code?

Yes, the vehicle is still drivable, but the power liftgate chime may not function, which could reduce your awareness of liftgate activity or malfunctions.

5. How do I diagnose the B2940 code?

Start by inspecting the wiring and connectors for damage or corrosion, test the chime module for proper operation, and check the voltage and ground connections in the circuit.

6. What tools are needed to fix the B2940 code?

You will need a multimeter to test for shorts, an OBDII scanner to clear the code, and potentially replacement parts like wires or the chime module.

7. How do I repair the B2940 code?

Repairs may involve fixing or replacing damaged wiring, cleaning corroded connectors, replacing the chime module, or reprogramming the BCM if necessary.

8. Is the B2940 code a manufacturer-specific code?

Yes, the B2940 code is typically manufacturer-specific, so the exact meaning and repair procedure may vary depending on the vehicle make and model.

9. Can a blown fuse cause the B2940 code?

A blown fuse is not a direct cause but could indicate an underlying short circuit that might trigger the code.

10. Should I consult a professional for the B2940 code?

If youâ€™re not comfortable with electrical diagnostics or the issue persists after basic checks, itâ€™s best to consult a professional mechanic for further inspection.