AutoCodes – Mercury – U210C Mercury

U210C Mercury Code - Lost Communication Between Fuel Pump Control Module 'B' and Restraints Control Module

Quick Answer

The Fuel Pump Control Module 2 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: U210C Mercury indicates Lost Communication Between Fuel Pump Control Module 'B' 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 1,622

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 U210C Mercury Description

The Fuel Pump Control Module 2 monitors the duty cycle and frequency of the signal it receives from the Restraints Control Module (RCM). The fuel pump control module 2 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 2 sends a 40% duty cycle signal on the Fuel Pump Monitor 2 (FPM2) circuit to report the concern to the Powertrain Control Module (PCM). The test fails when the fuel pump control module 2 is still reporting that it is receiving an invalid duty cycle or frequency from the RCM after a calibrated amount of time.

OBDII Code U210C Mercury - Lost Communication Between Fuel Pump Control Module 'B' and Restraints Control Module - AutoCodes.com — U210C Mercury Code - Lost Communication Between Fuel Pump Control Module 'B' and Restraints Control Module

What does this mean?

What are the Possible Causes of the DTC U210C 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) 2
Faulty Fuel Pump Control Module

How to Fix the DTC U210C 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 2 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 2 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 U210C 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 U210C Mercury Code

1. What are the common symptoms of OBDII code U210C in a Mercury vehicle?

- Common symptoms include the fuel pump not working, issues with the airbag system, and the check engine light coming on.

2. What does the OBDII code U210C for a Mercury indicate?

- The code U210C indicates a communication problem between the Fuel Pump Control Module 'B' and the Restraints Control Module.

3. What are the possible causes of the U210C code in a Mercury?

- Possible causes include wiring issues, a faulty fuel pump control module, a malfunctioning restraints control module, or a communication network problem.

4. How can I diagnose the U210C code in my Mercury?

- Diagnosing the U210C code involves checking the wiring connections between the fuel pump control module and the restraints control module, testing the modules for functionality, and verifying communication on the network.

5. Can I still drive my Mercury with the U210C code present?

- It is not recommended to drive your Mercury with the U210C code present as it may affect the fuel pump operation and potentially compromise the airbag system's functionality.

6. How can I repair the U210C code in my Mercury?

- Repairing the U210C code involves fixing any wiring issues, replacing faulty modules, and ensuring proper communication between the fuel pump control module and the restraints control module.

7. Is it safe to reset the U210C code in my Mercury with a diagnostic tool?

- It is safe to reset the U210C code with a diagnostic tool after addressing the underlying issue to see if the problem reoccurs.

8. Can a DIY enthusiast fix the U210C code in a Mercury?

- DIY enthusiasts with the necessary tools and knowledge of automotive systems may be able to fix the U210C code, but it is recommended to seek professional help for proper diagnosis and repair.

9. How much does it cost to repair the U210C code in a Mercury?

- The cost of repairing the U210C code can vary depending on the underlying issue, parts needed for replacement, and labor costs at a repair shop.

10. How urgent is it to address the U210C code in my Mercury?

- It is important to address the U210C code promptly to prevent potential safety hazards related to fuel pump operation and airbag system functionality.