AutoCodes – Mercedes-Benz – P0801 Mercedes-Benz

P0801 Mercedes-Benz Code - Reverse Inhibit Control Circuit Malfunction

Quick Answer

An ignition voltage is supplied to the Reverse Inhibit solenoid. Common causes include Faulty Reverse Inhibit Solenoid, Reverse Inhibit Solenoid harness is open or shorted, Reverse Inhibit Solenoid 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: P0801 Mercedes-Benz indicates Reverse Inhibit Control Circuit Malfunction.
Common causes: Common causes include Faulty Reverse Inhibit Solenoid, Reverse Inhibit Solenoid harness is open or shorted, Reverse Inhibit Solenoid 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 4,967

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 May 08, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0801 Mercedes-Benz Description

An ignition voltage is supplied to the Reverse Inhibit solenoid. The Powertrain Control Module (PCM) controls the solenoid by grounding the control circuit via an internal switch called a driver. The driver supplies the ground for the component being controlled. Each driver has a fault line which the PCM monitors. When the PCM commands a component ON, the voltage of the control circuit should be low (near 0 volts). When the PCM commands the control circuit to a component OFF, the voltage potential of the circuit should be high (near battery voltage). If the fault detection circuit senses a voltage other than what is expected, the fault line status changes causing the P0801 code to set.

OBDII Code P0801 Mercedes-Benz - Reverse Inhibit Control Circuit Malfunction - AutoCodes.com — P0801 Mercedes-Benz Code - Reverse Inhibit Control Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P0801 Mercedes-Benz?

Faulty Reverse Inhibit Solenoid
Reverse Inhibit Solenoid harness is open or shorted
Reverse Inhibit Solenoid circuit poor electrical connection

How to Fix the DTC P0801 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0801 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 P0801 Mercedes-Benz code?

Need more information on how to fix the P0801 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0801 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 P0801 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0801 in a Mercedes-Benz?

- Common symptoms may include the inability to shift into reverse, harsh shifting, and the transmission going into "limp mode."

2. What can cause the Reverse Inhibit Control Circuit Malfunction in a Mercedes-Benz?

- Possible causes include a faulty reverse inhibit solenoid, damaged wiring or connectors, or issues with the transmission control module.

3. How can I diagnose the Reverse Inhibit Control Circuit Malfunction in my Mercedes-Benz?

- Diagnosing this code typically involves using a diagnostic scanner to retrieve the fault codes, testing the reverse inhibit solenoid, and inspecting the wiring for any damage.

4. Can driving with OBDII code P0801 in a Mercedes-Benz cause further damage?

- Continuing to drive with this code may lead to further transmission issues and potential damage, so it is recommended to address the problem promptly.

5. Is it safe to continue driving my Mercedes-Benz with the Reverse Inhibit Control Circuit Malfunction?

- It is not advisable to drive the vehicle with this code present, as it can impact the transmission's performance and potentially lead to further damage.

6. How can I repair OBDII code P0801 in my Mercedes-Benz?

- Repair options may include replacing the faulty reverse inhibit solenoid, repairing damaged wiring or connectors, or reprogramming the transmission control module.

7. Can I reset the OBDII code P0801 in my Mercedes-Benz using a diagnostic scanner?

- Resetting the code with a diagnostic scanner is possible, but it is recommended to address the underlying issue causing the code before doing so.

8. Are there any DIY tips for fixing OBDII code P0801 in a Mercedes-Benz?

- DIY tips may include checking for loose or damaged wiring, ensuring proper connections, and inspecting the reverse inhibit solenoid for functionality.

9. How much does it typically cost to repair OBDII code P0801 in a Mercedes-Benz?

- The cost of repair can vary depending on the specific issue causing the code, but it may involve parts and labor expenses that can range from moderate to significant.

10. Can a mechanic help me fix OBDII code P0801 in my Mercedes-Benz?

- Yes, a qualified mechanic with experience in Mercedes-Benz vehicles can diagnose and repair the Reverse Inhibit Control Circuit Malfunction to ensure proper functioning of the transmission.