AutoCodes – Mercury – B0072 Mercury

B0072 Mercury Code - Passenger Seatbelt Pretensioner 'A' Deployment Control

Quick Answer

The Restraints Control Module (RCM) analyzes the deployment loop resistance to determine if a fault exists. Common causes include Faulty Passenger Seatbelt Pretensioner, Passenger Seatbelt Pretensioner harness is open or shorted, Passenger Seatbelt Pretensioner 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: B0072 Mercury indicates Passenger Seatbelt Pretensioner 'A' Deployment Control.
Common causes: Common causes include Faulty Passenger Seatbelt Pretensioner, Passenger Seatbelt Pretensioner harness is open or shorted, Passenger Seatbelt Pretensioner 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 2,066

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B0072 Mercury Description

The Restraints Control Module (RCM) analyzes the deployment loop resistance to determine if a fault exists. The value displayed in the PID is the deployment loop resistance measured by the RCM. If the value displayed is lower or higher than the desired range, the RCM can set a Diagnostic Trouble Code (DTC). As the deployment loop resistance drifts farther outside the desired range, the chance for a DTC increases. Small variations in resistance can occur due to the effect of road vibrations on terminal fit. Crimps and terminals can be affected by stress and harness movement and can cause an increase in resistance due to wire strain. These variables can result in an intermittent fault. For this reason, the test requires the PID value to be within the desired range before the fault is considered repaired, regardless if the module is reporting an on-demand DTC at the time of diagnosis. Following this direction helps make sure that minor changes in resistance do not create a repeat concern. This test uses the process of elimination to diagnose each part of the deployment loop circuit including:
- Wiring
- Connections
- Driver seatbelt anchor pretensioner
- RCM

OBDII Code B0072 Mercury - Passenger Seatbelt Pretensioner 'A' Deployment Control - AutoCodes.com — B0072 Mercury Code - Passenger Seatbelt Pretensioner 'A' Deployment Control

What does this mean?

What are the Possible Causes of the DTC B0072 Mercury?

Faulty Passenger Seatbelt Pretensioner
Passenger Seatbelt Pretensioner harness is open or shorted
Passenger Seatbelt Pretensioner circuit poor electrical connection
Faulty Restraints Control Module (RCM)

How to Fix the DTC B0072 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 does this mean?

Code Tech Notes

B0072:11 Passenger Seatbelt Pretensioner 'A' Deployment Control: Circuit Short to Ground
B0072:12 Passenger Seatbelt Pretensioner 'A' Deployment Control: Circuit Short to Battery
B0072:13 Passenger Seatbelt Pretensioner 'A' Deployment Control: Circuit Open
B0072:1A Passenger Seatbelt Pretensioner 'A' Deployment Control: Circuit Resistance Below Threshold

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0072 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 B0072 Mercury code?

Need more information on how to fix the B0072 Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0072 Mercury code diagnosed by a professional: Find a repair shop in your area

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

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 B0072 Mercury Code

1. What are the common symptoms of OBDII code B0072 in a Mercury related to the Passenger Seatbelt Pretensioner 'A' Deployment Control?

- The common symptoms include the airbag warning light staying illuminated on the dashboard and potential non-deployment of the passenger seatbelt pretensioner during a collision.

2. What are the typical causes of OBDII code B0072 in a Mercury?

- The code B0072 is usually triggered by a fault in the wiring harness, a loose connection, or a malfunctioning passenger seatbelt pretensioner 'A' deployment control module.

3. How can I diagnose the OBDII code B0072 in my Mercury?

- To diagnose the B0072 code, you can use an OBDII scanner to read the error codes, inspect the wiring and connections related to the passenger seatbelt pretensioner, and perform a thorough visual inspection for any visible damage.

4. Is it safe to drive my Mercury with OBDII code B0072 triggered?

- It is not recommended to drive the vehicle with the B0072 code triggered, as it indicates a potential safety issue with the passenger seatbelt pretensioner system, which may not deploy in the event of a collision.

5. How can I repair OBDII code B0072 in my Mercury?

- Repairing the B0072 code may involve repairing or replacing damaged wiring, securing loose connections, or replacing the passenger seatbelt pretensioner 'A' deployment control module as necessary.

6. Can I reset the OBDII code B0072 in my Mercury without fixing the underlying issue?

- While you can clear the error code using an OBDII scanner, it is crucial to address the root cause of the problem to ensure the proper functioning of the passenger seatbelt pretensioner system.

7. Are there any recalls or technical service bulletins related to OBDII code B0072 in Mercury vehicles?

- It's recommended to check with your local Mercury dealership or visit the manufacturer's website to see if there are any recalls or technical service bulletins related to the B0072 code for your specific model.

8. How much does it typically cost to repair OBDII code B0072 in a Mercury at a dealership or repair shop?

- The cost of repairing the B0072 code can vary depending on the extent of the issue and the labor rates at the dealership or repair shop. It's advisable to obtain a few quotes for an accurate estimate.

9. Can I fix OBDII code B0072 in my Mercury at home, or should I take it to a professional mechanic?

- While some DIY enthusiasts may be able to address the issue themselves, dealing with airbag and seatbelt systems can be complex and risky. It's generally recommended to have a professional mechanic diagnose and repair the problem to ensure safety and accuracy.

10. How often should I have the passenger seatbelt pretensioner system in my Mercury inspected to prevent OBDII code B0072 from occurring?

- It's a good practice to have the passenger seatbelt pretensioner system inspected during routine maintenance visits or whenever you notice any unusual symptoms related to the airbag system to prevent the occurrence of the B0072 code.