AutoCodes – Ford – U0115 Ford

U0115 Ford Code - Lost Communication With ECM/PCM 'B'

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Faulty Engine Control Module (ECM)/Powertrain Control Module (PCM) 'B', ECM/PCM 'B' harness is open or shorted, ECM/PCM 'B' 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: U0115 Ford indicates Lost Communication With ECM/PCM 'B'.
Common causes: Common causes include Faulty Engine Control Module (ECM)/Powertrain Control Module (PCM) 'B', ECM/PCM 'B' harness is open or shorted, ECM/PCM 'B' 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 3,164

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 Jan 08, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0115 Ford Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Engine Control Module (ECM)/Powertrain Control Module (PCM) 'B' has not been received.

OBDII Code U0115 Ford - Lost Communication With ECM/PCM 'B' - AutoCodes.com — U0115 Ford Code - Lost Communication With ECM/PCM 'B'

What does this mean?

What are the Possible Causes of the DTC U0115 Ford?

Faulty Engine Control Module (ECM)/Powertrain Control Module (PCM) 'B'
ECM/PCM 'B' harness is open or shorted
ECM/PCM 'B' circuit poor electrical connection

How to Fix the DTC U0115 Ford?

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 U0115 Ford 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 U0115 Ford Code

1. What does the OBDII code U0115 for Ford mean?

This code indicates a communication issue between the vehicle's control module (ECM/PCM) and another module labeled 'B'.

2. What are the common symptoms of U0115 code in a Ford vehicle?

Common symptoms include engine stalling, rough idling, loss of power, and various warning lights on the dashboard.

3. What are the possible causes of the U0115 code in a Ford?

Potential causes include damaged wiring, loose connections, a faulty ECM/PCM, a malfunctioning module 'B', or a software issue.

4. How do I diagnose the U0115 code in my Ford vehicle?

Diagnosing the U0115 code typically involves inspecting the wiring and connections between the modules, testing the ECM/PCM and module 'B', and using a diagnostic scanner to retrieve additional fault codes.

5. Can I still drive my Ford with the U0115 code present?

It's not recommended to drive your vehicle with the U0115 code as it can cause performance issues and potentially lead to further damage.

6. How can I repair the U0115 code in my Ford?

Repair options include fixing any damaged wiring or connections, replacing the ECM/PCM or module 'B' if necessary, and reprogramming the modules if a software issue is detected.

7. Can I reset the U0115 code in my Ford using a simple OBDII scanner?

While you can clear the code with an OBDII scanner, it's important to diagnose and address the underlying issue causing the code to prevent it from returning.

8. Is the U0115 code specific to certain Ford models?

The U0115 code can appear in various Ford models, including but not limited to Fusion, Focus, Escape, and Explorer.

9. How much does it typically cost to repair the U0115 code in a Ford?

The cost of repairing the U0115 code can vary depending on the specific cause, parts needed, and labor rates, so it's best to consult a professional for an accurate estimate.

10. What should I do if the U0115 code persists after repairs?

If the U0115 code reappears after repairs, it indicates that the issue was not fully resolved, and further diagnostic steps may be necessary to pinpoint and fix the problem.