AutoCodes – Generic – B124D

B124D Code - Tire Pressure Sensor General Signal Failure

Quick Answer

The Body Control Module (BCM) monitors the Tire Pressure Sensor. Common causes include Faulty Tire Pressure Sensor, Faulty Body Control Module (BCM), Body Control Module (BCM) harness is open or shorted. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: B124D indicates Tire Pressure Sensor General Signal Failure.
Common causes: Common causes include Faulty Tire Pressure Sensor, Faulty Body Control Module (BCM), Body Control Module (BCM) harness is open or shorted.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 11,580

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 19, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B124D Description

The Body Control Module (BCM) monitors the Tire Pressure Sensor. The OBDII code is set by the BCM in continuous memory when 1, 2 or 3 of the tire pressure sensors are faulted or not responding, or when data is not received by the BCM.

OBDII Code B124D - Tire Pressure Sensor General Signal Failure - AutoCodes.com — B124D Code - Tire Pressure Sensor General Signal Failure

What does this mean?

What are the Possible Causes of the DTC B124D?

Faulty Tire Pressure Sensor
Faulty Body Control Module (BCM)
Body Control Module (BCM) harness is open or shorted
Body Control Module (BCM) circuit poor electrical connection

How to Fix the DTC B124D?

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 B124D 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 B124D code?

Need more information on how to fix the B124D code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B124D code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B124D Ford — Tire Pressure Sensor General Signal Failure
B124D Lexus — Lost Communication With AFS LIN
B124D Lincoln — Tire Pressure Sensor General Signal Failure
B124D Mercury — Tire Pressure Sensor General Signal Failure
B124D Toyota — Lost Communication With AFS LIN

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 B124D Code

1. What does the OBDII code B124D mean?

The B124D code indicates a general signal failure in the tire pressure sensor, meaning the sensor is not transmitting data properly to the vehicle's tire pressure monitoring system (TPMS).

2. What are the common symptoms of the B124D code?

Symptoms include the TPMS warning light illuminating on the dashboard, inconsistent or missing tire pressure readings, and the inability to reset the TPMS system.

3. What causes the B124D code to appear?

Common causes include a malfunctioning tire pressure sensor, a dead sensor battery, damaged sensor wiring, or signal interference with the TPMS system.

4. Can I drive with the B124D code active?

Yes, you can drive, but it's not recommended for long periods since the TPMS system won't properly monitor tire pressures, increasing the risk of driving on underinflated or overinflated tires.

5. How do I fix the B124D code?

Repairs often involve replacing the faulty tire pressure sensor, checking for damaged wiring, or recalibrating the TPMS system using a diagnostic tool.

6. How can I identify which tire sensor is faulty?

A TPMS diagnostic scan tool can be used to identify the specific sensor that is not transmitting data, helping to pinpoint the issue.

7. How much does it cost to repair a B124D code?

Repair costs vary but typically range from $50 to $250 per sensor, depending on whether the sensor needs replacement or if recalibration is required.

8. Can a dead tire pressure sensor battery trigger the B124D code?

Yes, a dead or weak battery in the tire pressure sensor can cause a signal failure, leading to this code.

9. Do I need to replace all tire pressure sensors if one fails?

No, you only need to replace the faulty sensor. However, if the sensors are old, replacing all at once might be cost-effective to avoid future failures.

10. Can a B124D code be cleared without repairs?

Clearing the code temporarily is possible using a scan tool, but it will likely return unless the underlying issue is resolved.