AutoCodes – Mazda – P0746 Mazda

P0746 Mazda Code - Pressure Control Solenoid Performance or Stuck Off

Quick Answer

The Pressure Control (PC) Solenoid Valve is 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: P0746 Mazda indicates Pressure Control Solenoid Performance or Stuck Off.
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 4,403

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 30, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0746 Mazda Description

The Pressure Control (PC) Solenoid Valve is 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). The Diagnostic Trouble Code (DTC) will be set when the gear required by the Engine Control Module (ECM) does not match the actual gear when driving.

OBDII Code P0746 Mazda - Pressure Control Solenoid Performance or Stuck Off - AutoCodes.com — P0746 Mazda Code - Pressure Control Solenoid Performance or Stuck Off

What does this mean?

What are the Possible Causes of the DTC P0746 Mazda?

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 P0746 Mazda?

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 P0746 Mazda 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 P0746 Mazda Code

1. What are the common symptoms of OBDII code P0746 in a Mazda?

- Common symptoms include issues with shifting gears, slipping transmission, decreased fuel efficiency, and an illuminated Check Engine light.

2. What could cause the P0746 code to trigger in a Mazda?

- The P0746 code is usually triggered by a malfunction in the pressure control solenoid, low transmission fluid levels, a faulty transmission valve body, or wiring issues.

3. How can I diagnose the P0746 code in my Mazda?

- Diagnosis involves using an OBDII scanner to retrieve the fault code, inspecting the transmission fluid level and condition, checking for any visible damages to the wiring, and testing the pressure control solenoid.

4. Can I continue driving my Mazda with the P0746 code present?

- It is not recommended to drive your Mazda with the P0746 code present, as it can lead to further damage to the transmission system and potentially leave you stranded on the road.

5. What are some repair tips for fixing the P0746 code in a Mazda?

- Repair tips include checking and topping up the transmission fluid, replacing the pressure control solenoid if faulty, inspecting and repairing any damaged wiring, and ensuring proper functioning of the transmission valve body.

6. How much does it cost to repair the P0746 code in a Mazda?

- The cost of repairing the P0746 code can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

7. Can I reset the P0746 code in my Mazda by disconnecting the battery?

- Disconnecting the battery may temporarily clear the code, but it will not fix the underlying issue causing the P0746 code to trigger. It is recommended to diagnose and repair the problem to prevent further damage.

8. Is it possible to prevent the P0746 code from reoccurring in my Mazda?

- Regular maintenance of the transmission system, checking and replacing transmission fluid as needed, and addressing any issues promptly can help prevent the recurrence of the P0746 code in your Mazda.

9. How long does it typically take to repair the P0746 code in a Mazda?

- The repair time for the P0746 code can vary depending on the exact cause of the issue and the expertise of the mechanic, but it may take a few hours to a full day to complete the repair.

10. Are there any recalls related to the P0746 code in Mazda vehicles?

- It is advisable to check with Mazda or the National Highway Traffic Safety Administration (NHTSA) for any recalls related to the P0746 code in your specific Mazda model.