AutoCodes – Mercury – P0745 Mercury

P0745 Mercury 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 Mercury 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 929

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 04, 2021

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0745 Mercury 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 Mercury - Pressure Control Solenoid Malfunction - AutoCodes.com — P0745 Mercury Code - Pressure Control Solenoid Malfunction

What does this mean?

What are the Possible Causes of the DTC P0745 Mercury?

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 Mercury?

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 Mercury 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 Mercury Code

1. What are the common symptoms of OBDII code P0745 in a Mercury vehicle?

The common symptoms of code P0745 include harsh shifting, transmission slipping, decreased fuel efficiency, and the transmission going into "limp mode."

2. What causes the OBDII code P0745 in a Mercury vehicle?

The most common cause of OBDII code P0745 is a malfunctioning pressure control solenoid within the transmission system.

3. How serious is the OBDII code P0745 in a Mercury vehicle?

Code P0745 should be taken seriously as it can lead to further damage to the transmission if left unresolved. It is recommended to address this issue promptly.

4. Can I continue driving my Mercury with the OBDII code P0745 present?

It is not advisable to continue driving your Mercury with code P0745 present, as it can cause further damage to the transmission and potentially leave you stranded.

5. How can I diagnose the OBDII code P0745 in my Mercury?

Diagnosing code P0745 usually involves using a scan tool to retrieve the code, inspecting the transmission fluid for any signs of contamination, and testing the pressure control solenoid for proper functionality.

6. What are some repair tips for fixing the OBDII code P0745 in a Mercury vehicle?

Repairing code P0745 often involves replacing the pressure control solenoid, checking the wiring and connections for any faults, and ensuring the transmission fluid is at the correct level and in good condition.

7. Can a DIY enthusiast fix the OBDII code P0745 in a Mercury vehicle?

While some DIY enthusiasts may be able to replace the pressure control solenoid themselves, diagnosing and repairing transmission issues can be complex. It is recommended to consult a professional mechanic for proper diagnosis and repair.

8. How much does it typically cost to fix the OBDII code P0745 in a Mercury vehicle?

The cost of fixing code P0745 can vary depending on the labor rates and parts prices in your area. Generally, the repair cost can range from $200 to $500, including parts and labor.

9. Is it possible for code P0745 to reoccur after repairs in a Mercury vehicle?

Yes, it is possible for code P0745 to reoccur if the underlying issue was not properly addressed during the initial repair. It is crucial to ensure all relevant components are thoroughly inspected and repaired.

10. Can ignoring the OBDII code P0745 cause further damage to my Mercury's transmission?

Ignoring code P0745 can lead to further damage to the transmission, potentially resulting in more costly repairs down the line. It is recommended to address transmission issues promptly to avoid extensive damage.