AutoCodes – Mercedes-Benz – P0788 Mercedes-Benz

P0788 Mercedes-Benz Code - Shift/Timing Solenoid High

Quick Answer

Shift solenoid valve ST is switched ON OFF by a signal from Engine Control Module (ECM) so that let in or out timing of 2nd brake is adjusted by operating orifice control valve. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty shifting solenoid valve. 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: P0788 Mercedes-Benz indicates Shift/Timing Solenoid High.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty shifting solenoid valve.
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 3,052

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 P0788 Mercedes-Benz Description

Shift solenoid valve ST is switched ON OFF by a signal from Engine Control Module (ECM) so that let in or out timing of 2nd brake is adjusted by operating orifice control valve. Therefore, shift solenoid valve ST operates when letting in or out reverse clutch.

OBDII Code P0788 Mercedes-Benz - Shift/Timing Solenoid High - AutoCodes.com — P0788 Mercedes-Benz Code - Shift/Timing Solenoid High

What does this mean?

What are the Possible Causes of the DTC P0788 Mercedes-Benz?

Low transmission fluid level
Dirty transmission fluid
Faulty shifting solenoid valve
Shifting solenoid valve harness is open or shorted
Shifting solenoid valve circuit poor electrical connection

How to Fix the DTC P0788 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 P0788 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 P0788 Mercedes-Benz code?

Need more information on how to fix the P0788 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0788 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 P0788 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0788 in a Mercedes-Benz related to the Shift/Timing Solenoid High?

- Common symptoms include harsh shifting, delayed shifting, transmission slipping, and illuminated Check Engine light.

2. What are the possible causes of OBDII code P0788 Shift/Timing Solenoid High in a Mercedes-Benz?

- Potential causes may include a faulty shift solenoid, low transmission fluid levels, dirty or contaminated transmission fluid, or a malfunctioning transmission control module.

3. How can I diagnose OBDII code P0788 in my Mercedes-Benz?

- Diagnosis typically involves using a scan tool to read the code, checking the transmission fluid level and condition, inspecting the shift/timing solenoid, and testing the transmission control module.

4. Is it safe to continue driving my Mercedes-Benz with OBDII code P0788 Shift/Timing Solenoid High?

- It is not recommended to drive the vehicle with this code as it can lead to further damage to the transmission and potentially result in costly repairs.

5. Can I repair OBDII code P0788 in my Mercedes-Benz myself?

- Depending on your skill level and access to tools, some DIY repairs may be possible, such as replacing the shift solenoid or performing a transmission fluid flush. However, complex transmission repairs are best left to professional mechanics.

6. How much does it typically cost to repair OBDII code P0788 Shift/Timing Solenoid High in a Mercedes-Benz?

- The cost of repair can vary widely depending on the root cause of the issue and whether you choose to go to a dealership, independent mechanic, or attempt a DIY repair. Costs can range from a few hundred to over a thousand dollars.

7. Are there any preventive maintenance tips to avoid OBDII code P0788 in my Mercedes-Benz?

- Regularly servicing the transmission, checking and maintaining proper fluid levels, and addressing any shifting issues promptly can help prevent the occurrence of this code.

8. Can a bad shift solenoid cause other transmission problems besides triggering OBDII code P0788?

- Yes, a faulty shift solenoid can cause a range of transmission issues such as rough shifting, gear slippage, transmission overheating, and overall poor performance.

9. Will resetting the Check Engine light make OBDII code P0788 go away in my Mercedes-Benz?

- Resetting the Check Engine light without addressing the underlying issue causing the code will not fix the problem. The code is likely to return until the root cause is diagnosed and repaired.

10. How long does it typically take to repair OBDII code P0788 Shift/Timing Solenoid High in a Mercedes-Benz?

- The repair time can vary depending on the exact cause of the issue, availability of parts, and the mechanic's workload. In general, it may take a few hours to a full day to complete the repair.