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Engine-Codes – Generic – P1586

P1586 Code - MT/AT Encoding Signal Malfunction

Quick Answer

The P1586 diagnostic trouble code (DTC) indicates a malfunction in the encoding signal between the transmission (MT) or automatic transmission (AT) and the engine control module (ECM). Common causes include Faulty wiring or connectors between transmission and ECM, Malfunctioning transmission position sensor, Defective ECM. 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
P1586 indicates MT/AT Encoding Signal Malfunction.
Common causes
Common causes include Faulty wiring or connectors between transmission and ECM, Malfunctioning transmission position sensor, Defective ECM.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P1586 Description

The P1586 diagnostic trouble code (DTC) indicates a malfunction in the encoding signal between the transmission (MT) or automatic transmission (AT) and the engine control module (ECM). This code is typically found in vehicles with automatic transmission systems. The encoding signal is crucial for the proper communication between the transmission and the ECM, allowing for the correct operation of the transmission based on engine load, speed, and other factors.

OBDII Code P1586 - MT/AT Encoding Signal Malfunction
P1586 Code - MT/AT Encoding Signal Malfunction

Common Causes of P1586

  1. Faulty wiring or connectors between transmission and ECM
  2. Malfunctioning transmission position sensor
  3. Defective ECM
  4. Transmission issues
  5. Poor electrical connection

Symptoms of P1586

  1. Harsh or delayed shifting
  2. Erratic transmission behavior
  3. Stuck in a particular gear
  4. Poor acceleration
  5. Decreased fuel efficiency

How to Fix P1586

  1. Perform a thorough inspection of the wiring and connectors between the transmission and ECM to check for any signs of damage or corrosion. Repair or replace as needed.
  2. Test the transmission position sensor to ensure it is functioning correctly. Replace if faulty.
  3. Check the ECM for any signs of malfunction and perform diagnostic tests to determine if it needs to be repaired or replaced.
  4. Inspect the transmission system for any internal issues that may be affecting the encoding signal. Repair or replace components as necessary.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1586

The cost of repairing a P1586 code can vary depending on the specific cause of the issue. On average, you can expect to pay anywhere from $200 to $800 for parts and labor. Keep in mind that diagnosis time and labor rates can vary depending on the location, vehicle make and model, and the type of engine. It's recommended to consult with a qualified mechanic or repair shop for a more accurate estimate based on your specific situation.

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Code P1586 Information for Specific Makes

  • P1586 Audi — Engine Mounting Control Solenoid Bank 1 & 2 Short To Positive
  • P1586 Buick — Cruise Control Brake Switch 2 Circuit Conditions
  • P1586 Cadillac — Cruise Control Brake Switch 2 Circuit Conditions
  • P1586 Chevrolet — Cruise Control Brake Switch 2 Circuit Conditions
  • P1586 Ford — Throttle Control Unit Throttle Position Malfunction
  • P1586 GMC — Cruise Control Brake Switch 2 Circuit Conditions
  • P1586 Honda — Motor Power Inverter Module Current Signal/Battery Current Signal Circuit Problem
  • P1586 Hyundai — MT/AT Encoding Signal Malfunction
  • P1586 KIA — MT/AT Encoding Signal Malfunction
  • P1586 Volkswagen — Engine Mounting Control Solenoid Bank 1 & 2 Short To Positive
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 P1586 Code

1. What are the common symptoms of OBDII code P1586 (MT/AT Encoding Signal Malfunction)?

- Common symptoms include issues with shifting gears, hesitation during acceleration, and illuminated warning lights on the dashboard.

2. What are the possible causes of OBDII code P1586?

- Possible causes of this code include faulty transmission sensors, wiring issues, or a malfunctioning transmission control module.

3. How can I diagnose the MT/AT Encoding Signal Malfunction related to code P1586?

- Diagnosis typically involves using a scan tool to check for the specific fault codes, inspecting the transmission wiring, and testing the transmission sensors for proper functionality.

4. Can a DIY enthusiast repair OBDII code P1586 at home?

- While some simple repairs like checking and cleaning connectors or replacing damaged wiring can be done at home, diagnosing and repairing complex transmission issues may require professional help.

5. Is it safe to continue driving with OBDII code P1586 active?

- It is not recommended to drive with this code active, as it can lead to further transmission damage and potentially unsafe driving conditions.

6. How much does it typically cost to repair OBDII code P1586?

- The cost of repairing this code can vary depending on the exact cause of the issue, but it may range from $100 for simple fixes to several hundred dollars for more complex repairs.

7. Can resetting the OBDII code P1586 solve the issue temporarily?

- Resetting the code may temporarily turn off the warning light, but it will not fix the underlying issue causing the malfunction.

8. What are some preventive maintenance tips to avoid OBDII code P1586 in the future?

- Regularly checking and maintaining the transmission system, conducting timely fluid changes, and addressing any warning signs promptly can help prevent this code from appearing.

9. How long does it take to repair OBDII code P1586?

- The repair time can vary depending on the complexity of the issue and the availability of parts, but it may take a few hours to a day for a professional technician to diagnose and fix the problem.

10. Can extreme weather conditions contribute to the occurrence of OBDII code P1586?

- Yes, extreme temperatures or harsh weather conditions can sometimes exacerbate existing transmission issues, leading to the activation of this code.

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