AutoCodes – Lincoln – U0115 Lincoln

U0115 Lincoln 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 Lincoln 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 602

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

What does this mean?

What are the Possible Causes of the DTC U0115 Lincoln?

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 Lincoln?

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 Lincoln 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 Lincoln Code

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

The U0115 code indicates that there is a communication problem between the vehicle's control module (ECM/PCM) 'B' and another module.

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

Common symptoms include issues with engine performance, stalling, rough idling, and problems with the transmission or other control systems.

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

Potential causes include faulty wiring or connectors, a malfunctioning ECM/PCM 'B', a communication bus fault, or a problem with another control module.

4. How can I diagnose a U0115 code in my Lincoln?

To diagnose a U0115 code, you will need a professional OBDII scanner to retrieve the specific details of the code and perform further testing to identify the root cause of the communication failure.

5. Can I still drive my Lincoln with a U0115 code present?

It is not recommended to drive your vehicle with a U0115 code present, as it can lead to further damage or unsafe driving conditions due to potential communication failures between critical control modules.

6. How much does it usually cost to repair a U0115 code in a Lincoln vehicle?

The cost of repairing a U0115 code can vary depending on the underlying cause of the communication issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

7. Are there any DIY repair tips for fixing a U0115 code in a Lincoln?

DIY repair for a U0115 code is not recommended due to the complex nature of diagnosing and repairing communication faults between control modules. It is best to consult a professional mechanic for proper diagnosis and repair.

8. Is the U0115 code specific to Lincoln vehicles only?

The U0115 code is a generic communication fault code that can appear in various vehicle makes and models, not exclusive to Lincoln vehicles.

9. Can a U0115 code be caused by a dead battery in a Lincoln vehicle?

A dead or weak battery can potentially cause communication issues between control modules, leading to a U0115 code in some cases. It is advisable to ensure the battery is in good condition before diagnosing further.

10. How long does it typically take to repair a U0115 code in a Lincoln at a repair shop?

The repair time for a U0115 code can vary based on the exact cause of the communication fault and the availability of parts. It may take a few hours to a full day for diagnosis and repair to be completed by a professional technician.