P0746 — Pressure Control Solenoid “A” Performance/Stuck Off #

Note: The wording of this trouble code may differ slightly depending on the vehicle manufacturer.

• P0746: Pressure Control Solenoid “A” Performance or Stuck Off (General/OEMs)
• P0746: Pressure Control Solenoid A Performance (Nissan, Infiniti, Honda, GM, Toyota, Subaru, Chrysler, Ford)
• P0746: Pressure Control Solenoid A Stuck Off (Mazda, Hyundai, Kia)

Code P0746 Summary #

P0746 refers to a detected issue with the Pressure Control Solenoid “A” inside your vehicle’s automatic transmission. This solenoid is responsible for regulating hydraulic pressure, which controls gear changes and smooth shifting. When the Engine Control Module (ECM) or Transmission Control Module (TCM) identifies abnormal behavior—such as the solenoid being stuck “off” or not responding as expected—it logs this code. P0746 can lead to poor transmission performance, harsh or delayed shifts, and even transmission overheating if left unaddressed. The code’s specifics may vary, but the core problem relates to abnormal pressure regulation within the transmission valve body.

Common Symptoms for Code P0746 #

Drivers may notice several telltale signs if code P0746 is present. Some symptoms can be subtle at first, while others are immediately obvious. Pay attention to these, as ignoring them can lead to more severe transmission damage:

• Harsh, delayed, or erratic gear shifts
• Transmission slipping—engine revs increase without corresponding acceleration
• Stuck in one gear (limp mode)
• Check Engine Light (CEL) or Transmission Warning Light illuminated
• Overheating transmission (sometimes with a warning message)
• Poor fuel economy due to improper gear engagement

Probable Causes for Code P0746 #

Several issues can trigger P0746, but some are more common than others. The most frequent causes are related to either the solenoid itself, the fluid it controls, or its electrical controls. Here are the most likely culprits, in order of probability:

1. Faulty Pressure Control Solenoid “A” (electrical or mechanical failure)
2. Dirty, degraded, or low transmission fluid
3. Open, shorted, or corroded wiring/connectors to the solenoid
4. Internal transmission hydraulic blockages (valve body issues)
5. Faulty Transmission Control Module (TCM) or (rarely) ECM
6. Mechanical wear or failure inside the transmission (clutches, seals, etc.)

Step-by-Step Diagnosis for Code P0746 #

Proper diagnosis of P0746 involves a logical, step-by-step approach. Rushing or skipping steps can lead to incorrect repairs and wasted time. Here’s how a professional technician would proceed:

• Verify the code with a professional OBD-II scanner and check for any related transmission codes.
• Inspect transmission fluid level and condition (look for contamination, burnt smell, or low level).
• Visually inspect wiring and connectors at the transmission and solenoid harness for corrosion, damage, or loose connections.
• Test the solenoid using an ohmmeter (check resistance to see if it matches OEM specifications).
• Command the solenoid on/off with a scan tool and observe if it responds correctly.
• Monitor live transmission data for abnormal pressure readings or shift patterns.
• If all external checks pass, consider internal inspection: transmission pan removal to look for debris, or testing the valve body/solenoid directly.

Possible Repairs for Code P0746 #

Once the cause is pinpointed, the following repairs are typically performed to resolve P0746. Always address the root cause, not just the symptoms, to avoid repeat issues:

• Replace the Pressure Control Solenoid “A” if it’s confirmed faulty.
• Flush and replace transmission fluid and filter if fluid is dirty, burnt, or low.
• Repair or replace damaged wiring or connectors at the transmission/solenoid harness.
• Clean or repair the valve body if there are internal blockages.
• Reprogram or replace the TCM only if it’s proven defective (rare).
• Major transmission repair or rebuild if internal damage or excessive wear is found.

Can You Drive with Code P0746? #

Driving is not recommended when code P0746 is active. While the car may still move, you risk severe transmission damage due to improper pressure control. At best, you’ll experience poor performance and reduced fuel economy; at worst, you could be left stranded or facing a costly rebuild. It’s safest to have the vehicle inspected and repaired as soon as possible to prevent further damage.

Vehicles Most Commonly Affected by Code P0746 #

While P0746 can appear on any vehicle with an electronically controlled automatic transmission, it is most often reported on:

• Nissan and Infiniti (Altima, Maxima, Murano, Pathfinder, Quest, G35, FX35)
• Honda/Acura (Accord, Odyssey, Pilot, TL, MDX)
• Toyota/Lexus (Camry, Corolla, RAV4, ES350)
• Subaru (Outback, Legacy, Forester)
• General Motors (Chevy Malibu, Impala, Silverado, GMC Sierra)
• Hyundai/Kia (Sonata, Santa Fe, Sorento, Optima)
• Chrysler/Dodge/Jeep (300, Charger, Grand Cherokee, Town & Country)

Common Mistakes & Best Practices for Code P0746 #

Misdiagnosis is common with P0746, especially if transmission fluid or wiring concerns are overlooked. Here are the pitfalls to avoid and the habits to adopt:

• Do not replace the solenoid before checking the fluid—dirty or low fluid is a frequent culprit.
• Never ignore wiring and connector issues—they can mimic solenoid failure.
• Always use OEM-spec transmission fluid after a flush—wrong fluid can cause repeat codes.
• Don’t clear the code before confirming repairs—verify the fix with a test drive and live data.
• Refer to OEM service information for exact resistance values and procedures.

Quick FAQ for Code P0746 #

Is replacing the solenoid always necessary for P0746?
No. Sometimes the problem is caused by dirty or low transmission fluid, wiring issues, or a sticking valve body. Proper diagnosis is key.

Will a transmission fluid flush fix P0746?
It can, if the issue is due to contamination or minor blockage. However, if the solenoid or wiring is faulty, a flush alone won’t resolve the code.