AutoCodes – Subaru – B2806 Subaru

B2806 Subaru Code - Engine Control Module Abnormal

Quick Answer

The Diagnostic Trouble Code (DTC) sets when cruise indicator illumination request from Engine Control Module (ECM) and ON/OFF information of cruise function do not match. Common causes include Faulty Engine Control Module (ECM), Engine Control Module (ECM) harness is open or shorted, Engine Control Module (ECM) 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: B2806 Subaru indicates Engine Control Module Abnormal.
Common causes: Common causes include Faulty Engine Control Module (ECM), Engine Control Module (ECM) harness is open or shorted, Engine Control Module (ECM) 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 26,682

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 Feb 11, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2806 Subaru Description

The Diagnostic Trouble Code (DTC) sets when cruise indicator illumination request from Engine Control Module (ECM) and ON/OFF information of cruise function do not match.

OBDII Code B2806 Subaru - Engine Control Module Abnormal - AutoCodes.com — B2806 Subaru Code - Engine Control Module Abnormal

What does this mean?

What are the Possible Causes of the DTC B2806 Subaru?

Faulty Engine Control Module (ECM)
Engine Control Module (ECM) harness is open or shorted
Engine Control Module (ECM) circuit poor electrical connection

How to Fix the DTC B2806 Subaru?

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 B2806 Subaru 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 B2806 Subaru Code

1. What are common symptoms of OBDII code B2806 in a Subaru?

- Common symptoms include engine misfires, rough idling, decreased fuel efficiency, and potentially stalling.

2. What can cause the OBDII code B2806 in a Subaru?

- The code B2806 typically indicates an abnormality in the Engine Control Module (ECM) related to communication errors or internal faults.

3. How can I diagnose the OBDII code B2806 in my Subaru?

- Diagnosing the code B2806 involves using a scan tool to retrieve the specific fault codes and examining the ECM for any visible signs of damage.

4. Can a faulty wiring harness cause code B2806 in a Subaru?

- Yes, a faulty wiring harness, particularly those related to the ECM or communication lines, can trigger the B2806 code in a Subaru.

5. What repair options are available for fixing the OBDII code B2806 in a Subaru?

- Repair options may include checking and repairing any damaged wiring, resetting the ECM, updating software, or replacing the ECM if necessary.

6. Is it safe to drive my Subaru with the OBDII code B2806 present?

- It is not recommended to drive your Subaru with the B2806 code present, as it can lead to performance issues and potential long-term damage to the engine.

7. Can a DIY enthusiast fix the OBDII code B2806 issue in a Subaru?

- Depending on the root cause, some DIY enthusiasts may be able to address the B2806 code by checking wiring connections and performing basic troubleshooting steps.

8. How much does it cost to repair the OBDII code B2806 in a Subaru at a dealership?

- Repair costs for the B2806 code at a dealership can vary based on the exact cause, but expenses may include diagnostic fees, parts replacement, and labor charges.

9. Are there any preventative measures to avoid triggering the OBDII code B2806 in a Subaru?

- Regular maintenance, such as checking and maintaining the wiring integrity, keeping the ECM software updated, and addressing any engine-related issues promptly, can help prevent the B2806 code from appearing.

10. What is the role of the Engine Control Module (ECM) in relation to the OBDII code B2806 in a Subaru?

- The ECM is a critical component that controls various engine functions and monitors the vehicle's performance. Issues with the ECM can lead to the triggering of the B2806 code in a Subaru.