AutoCodes – Mercury – B1251 Mercury

B1251 Mercury Code - Tire Pressure Sensor Low Battery No Sub Type Information

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: B1251 Mercury indicates Tire Pressure Sensor Low Battery No Sub Type Information.
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 969

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 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1251 Mercury Description

The Body Control Module (BCM) monitors the Tire Pressure Sensor. The OBDII code is set by the BCM in continuous memory when attempting to train a Tire Pressure Monitor System (TPMS) Warning Light ON sensor(s) with a low battery. The TPMS warning indicator flashes for 70 seconds and then remains on continuously when the ignition is turned to the ON position, and the message center displays TIRE PRESSURE SENSOR FAULT.

OBDII Code B1251 Mercury - Tire Pressure Sensor Low Battery No Sub Type Information - AutoCodes.com — B1251 Mercury Code - Tire Pressure Sensor Low Battery No Sub Type Information

What does this mean?

What are the Possible Causes of the DTC B1251 Mercury?

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 B1251 Mercury?

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 B1251 Mercury 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 B1251 Mercury code?

Need more information on how to fix the B1251 Mercury code? Get Access to Factory Service Manuals

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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 B1251 Mercury Code

1. What are the common symptoms of OBDII code B1251 on a Mercury related to tire pressure sensor low battery with no sub type information?

The common symptoms include a tire pressure monitoring system (TPMS) warning light illuminated on the dashboard and a message indicating low tire pressure.

2. What causes the OBDII code B1251 to appear on a Mercury?

The code B1251 typically occurs when the tire pressure sensor's battery is low, or the sensor is malfunctioning due to a low battery level.

3. How can I diagnose the OBDII code B1251 on my Mercury?

To diagnose the code B1251, you can use an OBDII scanner to retrieve the specific trouble code and then inspect the tire pressure sensors for low battery levels or any other visible issues.

4. Can I drive my Mercury with the OBDII code B1251 present?

While you can technically drive with the code B1251, it is recommended to address the low tire pressure sensor battery issue promptly to ensure accurate tire pressure monitoring for safety.

5. How can I repair the OBDII code B1251 related to tire pressure sensor low battery on my Mercury?

The typical repair involves replacing the affected tire pressure sensor(s) with new ones that have fresh batteries to resolve the low battery issue.

6. Are there any DIY tips for fixing the OBDII code B1251 on a Mercury?

If you are comfortable working on your vehicle, you can attempt to replace the tire pressure sensor(s) yourself using the appropriate tools and following the manufacturer's instructions.

7. Will resetting the OBDII code B1251 on my Mercury make the warning disappear permanently?

Resetting the code may temporarily clear the warning, but if the root cause, such as low tire pressure sensor battery, is not addressed, the code is likely to reappear.

8. Can extreme temperatures affect the tire pressure sensor battery and trigger the OBDII code B1251?

Yes, extreme temperatures, especially cold weather, can affect the performance of the tire pressure sensor battery and lead to the B1251 trouble code.

9. Should I replace all tire pressure sensors at once if I encounter the OBDII code B1251 on my Mercury?

While it's not necessary to replace all sensors at once, it's recommended to inspect and potentially replace any sensors showing low battery levels or malfunctioning to prevent future issues.

10. How can regular maintenance help prevent the occurrence of the OBDII code B1251 on a Mercury?

Regularly checking and maintaining proper tire pressure, along with periodic inspection of the tire pressure sensors, can help prevent issues like low battery levels and reduce the likelihood of triggering the B1251 code.