AutoCodes – Mercedes-Benz – P0745 Mercedes-Benz

P0745 Mercedes-Benz Code - Pressure Control Solenoid Malfunction

Quick Answer

The Pressure Control (PC) Solenoid Valve an electronic pressure regulator that controls transmission line pressure based on current flow through its coil windings. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty line pressure 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: P0745 Mercedes-Benz indicates Pressure Control Solenoid Malfunction.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty line pressure 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 17,908

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 Jan 29, 2019

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0745 Mercedes-Benz Description

The Pressure Control (PC) Solenoid Valve an electronic pressure regulator that controls transmission line pressure based on current flow through its coil windings. As current flow is increased, the magnetic field produced by the coil moves the solenoid’s plunger further away from the exhaust port. Opening the exhaust port decreases the output fluid pressure regulated by the PC solenoid valve, which ultimately decreases line pressure. The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the Transmission Control Module (TCM).

OBDII Code P0745 Mercedes-Benz - Pressure Control Solenoid Malfunction - AutoCodes.com — P0745 Mercedes-Benz Code - Pressure Control Solenoid Malfunction

What does this mean?

What are the Possible Causes of the DTC P0745 Mercedes-Benz?

Low transmission fluid level
Dirty transmission fluid
Faulty line pressure solenoid valve
Line pressure solenoid valve harness is open or shorted
Line pressure solenoid valve circuit poor electrical connection

How to Fix the DTC P0745 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

When a transmission solenoid is malfunctioned, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. If the transmission fluid is dirty, it's recommended to change the transmission fluid and if possible removing the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a mechanical transmission failure and that the transmission will need to be rebuilt or replaced.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0745 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.

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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 P0745 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0745 in a Mercedes-Benz related to pressure control solenoid malfunction?

- Common symptoms include harsh shifting, delayed gear engagement, transmission slipping, and illuminated Check Engine Light.

2. What are the possible causes of OBDII code P0745 in a Mercedes-Benz?

- The code P0745 is typically triggered by a faulty pressure control solenoid, low transmission fluid, a defective transmission control module, or wiring issues.

3. How can I diagnose a pressure control solenoid malfunction causing OBDII code P0745 in my Mercedes-Benz?

- Diagnosis involves using a scan tool to retrieve the code, checking the transmission fluid level and condition, inspecting the wiring harness for damage, and testing the pressure control solenoid for proper function.

4. Can I continue driving my Mercedes-Benz with OBDII code P0745 present?

- It is not recommended to drive with the code P0745 as it can lead to further transmission damage and potential safety issues. It's best to address the underlying problem promptly.

5. What are some repair options for fixing OBDII code P0745 in a Mercedes-Benz?

- Repair options include replacing the pressure control solenoid, addressing any transmission fluid issues, repairing or replacing damaged wiring, or reprogramming the transmission control module.

6. How much does it typically cost to repair OBDII code P0745 in a Mercedes-Benz?

- The cost of repair can vary depending on the extent of the issue and the specific repairs needed. It's advisable to consult a professional mechanic for an accurate diagnosis and cost estimate.

7. Can I reset the Check Engine Light after repairing OBDII code P0745 in my Mercedes-Benz?

- Yes, the Check Engine Light can be reset using an OBDII scanner after the repair has been completed and the underlying issue causing the code P0745 has been resolved.

8. Are there any preventive maintenance steps to avoid OBDII code P0745 in a Mercedes-Benz?

- Regularly servicing the transmission, checking transmission fluid levels, and addressing any leaks or issues promptly can help prevent the occurrence of code P0745 in a Mercedes-Benz.

9. Will OBDII code P0745 cause my Mercedes-Benz to go into limp mode?

- Depending on the severity of the issue causing the code P0745, the transmission may go into limp mode to prevent further damage. It's crucial to address the problem to avoid this situation.

10. How long does it take to repair OBDII code P0745 in a Mercedes-Benz?

- The repair time for OBDII code P0745 can vary based on the specific issue and the expertise of the mechanic. It's recommended to consult with a professional for an accurate estimate of the repair duration.