AutoCodes – Mercury – U210B Mercury

U210B Mercury Code - Lost Communication Between Fuel Pump Control Module 'A' and Restraints Control Module

Quick Answer

The Fuel Pump Control Module monitors the duty cycle and frequency of the signal it receives from the Restraints Control Module (RCM). Common causes include Event Notification Signal (ENS) harness is open or shorted, Event Notification Signal (ENS) circuit poor electrical connection, Radio frequency interference or electromagnetic interference. 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: U210B Mercury indicates Lost Communication Between Fuel Pump Control Module 'A' and Restraints Control Module.
Common causes: Common causes include Event Notification Signal (ENS) harness is open or shorted, Event Notification Signal (ENS) circuit poor electrical connection, Radio frequency interference or electromagnetic interference.
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 1,490

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 15, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U210B Mercury Description

The Fuel Pump Control Module monitors the duty cycle and frequency of the signal it receives from the Restraints Control Module (RCM). The fuel pump control module determines if the signal on the Event Notification Signal (ENS) circuit from the RCM is a valid duty cycle and frequency. If the duty cycle or frequency is invalid, the fuel pump control module sends a 40% duty cycle signal on the Fuel Pump Monitor (FPM) circuit to report the concern to the Powertrain Control Module (PCM). The test fails when the fuel pump control module is still reporting that it is receiving an invalid duty cycle or frequency from the RCM after a calibrated amount of time.

OBDII Code U210B Mercury - Lost Communication Between Fuel Pump Control Module 'A' and Restraints Control Module - AutoCodes.com — U210B Mercury Code - Lost Communication Between Fuel Pump Control Module 'A' and Restraints Control Module

What does this mean?

What are the Possible Causes of the DTC U210B Mercury?

Event Notification Signal (ENS) harness is open or shorted
Event Notification Signal (ENS) circuit poor electrical connection
Radio frequency interference or electromagnetic interference
Faulty Restraints Control Module (RCM)
Faulty Fuel Pump Control Module

How to Fix the DTC U210B 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

Check the harness for routing, alterations, incorrect shielding, or electrical interference from other systems. The Event Notification Signal (ENS) is used to notify the fuel pump control module of an event requiring the fuel pump to be disabled. This signal is used instead of an Inertia Fuel Shutoff (IFS) switch. The fuel pump control module monitors the ENS signal by sending a 12V low current signal on the ENS circuit to the Restraints Control Module (RCM).

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U210B 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.

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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 U210B Mercury Code

1. What are the common symptoms of OBDII code U210B in a Mercury related to lost communication between the fuel pump control module and restraints control module?

Common symptoms include issues with starting the vehicle, fuel pump not engaging, airbag warning lights on the dashboard, and the vehicle going into a limp mode.

2. What are some possible causes of OBDII code U210B in a Mercury?

Possible causes include a faulty fuel pump control module, a malfunctioning restraints control module, damaged wiring or connectors, software issues, or a poor connection in the communication network.

3. How can I diagnose the root cause of OBDII code U210B in my Mercury?

Diagnosing the issue typically involves using an OBDII scanner to retrieve the code, checking for any additional related codes, inspecting the wiring and connectors for damage, and performing tests to pinpoint the faulty component.

4. Is it safe to continue driving my Mercury with the U210B code present?

It is not recommended to continue driving the vehicle with this code present, as it can lead to potential safety hazards due to the loss of communication between critical modules.

5. How can I repair OBDII code U210B in my Mercury?

Repairing the issue involves identifying and fixing the root cause, which may include replacing the fuel pump control module, restraints control module, repairing damaged wiring, or addressing any software-related issues.

6. Can I reset the OBDII code U210B in my Mercury on my own?

You can attempt to clear the code using an OBDII scanner, but it is crucial to address the underlying problem first to prevent the code from reoccurring.

7. Will OBDII code U210B cause my Mercury to fail an emissions test?

The U210B code alone may not directly cause your Mercury to fail an emissions test, but it indicates a problem that should be resolved to ensure the vehicle is functioning properly.

8. Are there any common fixes or quick tips for resolving OBDII code U210B in a Mercury?

Common fixes include checking and cleaning the connectors, ensuring proper grounding, and verifying the software versions of the control modules are up-to-date.

9. Can a DIY enthusiast with basic automotive knowledge repair OBDII code U210B in a Mercury?

While some aspects of diagnosing and repairing this code may be within reach for DIY enthusiasts, it is recommended to consult with a professional mechanic or dealership for a comprehensive and accurate fix.

10. How much can I expect to spend on repairing OBDII code U210B in my Mercury?

The cost of repairing this code can vary depending on the root cause of the issue, the labor rates in your area, and whether new parts need to be purchased. It is advisable to get estimates from local mechanics or dealerships for an accurate cost assessment.