AutoCodes – Mercedes-Benz – P0814 Mercedes-Benz

P0814 Mercedes-Benz Code - Transmission Range Display Circuit

Quick Answer

The transmission control module on modern vehicles monitors parameters such as transmission fluid temperature, fluid pressure, selector lever position, engine speed, vehicle speed, and load. Common causes include Faulty Transmission Range Display, Transmission Range Display harness is open or shorted, Transmission Range Display 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: P0814 Mercedes-Benz indicates Transmission Range Display Circuit.
Common causes: Common causes include Faulty Transmission Range Display, Transmission Range Display harness is open or shorted, Transmission Range Display 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 13,007

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 Jul 05, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0814 Mercedes-Benz Description

The transmission control module on modern vehicles monitors parameters such as transmission fluid temperature, fluid pressure, selector lever position, engine speed, vehicle speed, and load. The module can calculate the correct gear ratio to be selected depending on this data. Actuators are used to allow a smooth gear change. The monitor can also detect when a fault occurs which results in a shifting issue or the incorrect gear ratio being selected. A scan tool can be used to monitor live data on a road test. Occasionally manufacturers will support actuator tests. An oscilloscope can be used to test actuators during an actuator test with a scan tool.

OBDII Code P0814 Mercedes-Benz - Transmission Range Display Circuit - AutoCodes.com — P0814 Mercedes-Benz Code - Transmission Range Display Circuit

What does this mean?

What are the Possible Causes of the DTC P0814 Mercedes-Benz?

Faulty Transmission Range Display
Transmission Range Display harness is open or shorted
Transmission Range Display circuit poor electrical connection

How to Fix the DTC P0814 Mercedes-Benz?

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

There is a Factory Service Bulletin for the various Mercedes-Benz models.
Mercedes-Benz Factory Service Bulletin OBDII Code P0814

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0814 Mercedes-Benz 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.

Need more information about the P0814 Mercedes-Benz code?

Need more information on how to fix the P0814 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0814 Mercedes-Benz code diagnosed by a professional: Find a repair shop in your area

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 P0814 Mercedes-Benz Code

1. What are common symptoms of OBDII code P0814 in a Mercedes-Benz related to the Transmission Range Display Circuit?

- Common symptoms include inaccurate gear display on the dashboard, difficulty shifting gears, and potential illumination of the Check Engine Light.

2. What are possible causes of OBDII code P0814 in a Mercedes-Benz?

- The code P0814 in a Mercedes-Benz is often caused by faulty transmission range display circuit wiring, a defective transmission range sensor, or a malfunctioning control module.

3. How can I diagnose OBDII code P0814 in my Mercedes-Benz?

- Diagnosing OBDII code P0814 involves using a diagnostic scanner to retrieve the code, checking the transmission range sensor for proper operation, and inspecting the wiring for any damage or loose connections.

4. Can I continue driving my Mercedes-Benz with OBDII code P0814 present?

- It is not recommended to drive your Mercedes-Benz with OBDII code P0814 present, as it can lead to transmission issues and potential safety hazards. It is best to address the problem promptly.

5. How can I repair OBDII code P0814 in my Mercedes-Benz?

- Repairing OBDII code P0814 typically involves repairing or replacing any damaged wiring in the transmission range display circuit, replacing the faulty transmission range sensor, or reprogramming the control module as needed.

6. Will resetting the error code make OBDII code P0814 disappear permanently?

- Resetting the error code may temporarily make OBDII code P0814 disappear, but if the underlying issue is not addressed, the code is likely to reappear once the problem resurfaces.

7. Can a DIY enthusiast fix OBDII code P0814 in a Mercedes-Benz?

- While some DIY enthusiasts may have the skills to diagnose and repair OBDII code P0814, it is recommended to seek professional help, especially when dealing with transmission-related issues in a Mercedes-Benz.

8. Are there any preventive measures to avoid OBDII code P0814 in a Mercedes-Benz?

- Regularly inspecting the transmission range sensor, maintaining the wiring integrity, and addressing any transmission-related symptoms promptly can help prevent the occurrence of OBDII code P0814 in a Mercedes-Benz.

9. How long does it typically take to repair OBDII code P0814 in a Mercedes-Benz?

- The repair time for OBDII code P0814 in a Mercedes-Benz can vary depending on the extent of the issue, but it usually takes a few hours to a full day to diagnose and fix the problem.

10. Is OBDII code P0814 specific to Mercedes-Benz vehicles only?

- OBDII code P0814 related to the Transmission Range Display Circuit can occur in various vehicle makes and models, not just limited to Mercedes-Benz.