P0746 Pressure Control Solenoid "A" Performance / Stuck Off

The P0746 trouble code is an OBD-II diagnostic trouble code related to the operation of Pressure Control Solenoid "A" in an automatic transmission.

P0746 – Pressure Control Solenoid "A" Performance / Stuck Off

This code means that the Transmission Control Module (TCM) has detected that Pressure Control Solenoid "A" is not producing the expected hydraulic-pressure response, or that the solenoid is behaving as if it is stuck in the OFF position.

Unlike P0748, which specifically points toward an electrical fault, P0746 can involve the solenoid, hydraulic system, valve body, transmission fluid, wiring or the actual transmission pressure response.

This distinction is important because replacing the solenoid without checking the hydraulic system may not solve the problem.

What Does P0746 Mean?

An automatic transmission needs precisely controlled hydraulic pressure to engage clutches and brake elements.

The TCM calculates how much pressure is required according to conditions such as:

• Engine load

• Throttle position

• Vehicle speed

• Engine RPM

• Transmission temperature

• Selected gear

• Input shaft speed

• Output shaft speed

The simplified control path is:

TCM → Pressure Control Solenoid "A" → Hydraulic Pressure → Clutch / Brake → Gear Operation

When the TCM commands a specific pressure but the transmission does not respond as expected, it may store:

P0746 – Pressure Control Solenoid "A" Performance / Stuck Off

The exact monitoring strategy varies between manufacturers.

What Is Pressure Control Solenoid "A"?

Pressure Control Solenoid "A" is an electronically controlled hydraulic valve.

Its primary purpose is generally to regulate transmission-fluid pressure.

Depending on the transmission design, it can influence:

• Line pressure

• Clutch pressure

• Shift quality

• Clutch engagement

• Shift timing

• Torque converter operation

• Transmission protection

The exact function is transmission-specific.

Therefore, Pressure Control Solenoid "A" does not necessarily control the same hydraulic circuit on every vehicle.

What Does "Performance" Mean?

"Performance" means the TCM has detected that the solenoid's actual result does not correspond to the expected result.

For example, the TCM may command increased pressure but detect that transmission pressure does not rise as expected.

This can happen because:

• The solenoid is weak

• The solenoid is sticking

• The valve body is worn

• A hydraulic passage is restricted

• Transmission fluid is contaminated

• Internal pressure is leaking

• The wiring is malfunctioning

• The transmission has internal mechanical wear

What Does "Stuck Off" Mean?

"Stuck Off" means that the system detects a condition consistent with Pressure Control Solenoid "A" remaining inactive or failing to produce the expected pressure-control effect.

This does not necessarily mean that the solenoid's electrical circuit is completely dead.

A solenoid may receive the correct electrical command but still fail to create the required hydraulic response because it is mechanically stuck or because the valve body has a problem.

Symptoms of P0746

Possible symptoms include:

• Check Engine Light

• Transmission warning light

• Harsh shifting

• Soft shifting

• Delayed shifting

• Erratic gear changes

• Transmission slipping

• RPM flare during shifts

• Delayed Drive engagement

• Delayed Reverse engagement

• Limp mode

• Reduced acceleration

• Poor fuel economy

• Transmission overheating

The symptoms depend heavily on the transmission's hydraulic design.

What Does P0746 Feel Like While Driving?

Harsh shifts

If the transmission cannot regulate pressure correctly, shifts may become unusually firm.

Soft or delayed shifts

Insufficient pressure can delay clutch engagement.

Transmission slipping

If clutch pressure is inadequate, the clutch may not fully engage.

RPM flare

Engine RPM may increase unexpectedly during a gear change.

Delayed engagement

The transmission may take longer than normal to engage Drive or Reverse.

Limp mode

The TCM may restrict transmission operation when it cannot reliably control hydraulic pressure.

Common Causes of P0746

Failing Pressure Control Solenoid "A"

The solenoid may be worn, contaminated or mechanically stuck.

Sticking solenoid valve

Debris can prevent the valve from moving freely.

Contaminated transmission fluid

Dirt and clutch material can interfere with solenoid and valve-body operation.

Low transmission-fluid level

Insufficient fluid can cause unstable hydraulic pressure.

Incorrect transmission fluid

Incorrect fluid characteristics can affect pressure control.

Worn valve body

Wear in the valve body can cause internal pressure leakage.

Sticking valve-body valve

A hydraulic valve may not move correctly.

Restricted hydraulic passage

Debris can reduce fluid flow.

Internal pressure leakage

Worn seals or other internal components can prevent pressure from reaching the required level.

Damaged wiring

The solenoid may not receive the correct command.

Corroded connector

Poor electrical contact can interfere with solenoid control.

Internal transmission harness problem

The electrical fault may exist inside the transmission.

Transmission pump problem

Insufficient pump output can prevent the system from achieving the commanded pressure.

Internal transmission wear

Worn clutches, seals or other components can affect hydraulic performance.

TCM problem

A control-module problem is possible but generally less common.

Is P0746 Serious?

Yes, P0746 can be a serious transmission fault.

The transmission depends on correct hydraulic pressure for proper clutch engagement.

If pressure is consistently too low or the pressure-control system does not respond correctly, the transmission may experience:

• Clutch slip

• Excessive heat

• Harsh or delayed shifts

• Accelerated internal wear

• Reduced transmission life

However, P0746 does not automatically mean the transmission needs to be rebuilt or replaced.

The actual cause must be determined through electrical and hydraulic testing.

Can You Drive With P0746?

Driving should generally be limited until the cause is identified.

If the transmission is shifting normally and only the warning light is present, a short trip to a repair facility may be possible.

Avoid continued driving if you experience:

• Severe slipping

• Violent shifting

• Loss of Drive

• Loss of Reverse

• Transmission overheating

• Strong burnt-fluid smell

• Severe RPM flare

• Persistent limp mode

Continuing to drive while the transmission is slipping can significantly increase internal damage.

P0746 vs. P0745

P0745 – Pressure Control Solenoid "A" Malfunction

A general malfunction involving Pressure Control Solenoid "A".

P0746 – Pressure Control Solenoid "A" Performance / Stuck Off

The system detects that the solenoid's performance is outside the expected range or that it is behaving as though it is stuck OFF.

P0746 therefore provides more information about the type of failure being detected.

P0746 vs. P0747

P0746 – Pressure Control Solenoid "A" Performance / Stuck Off

The solenoid is not producing the expected pressure response or is detected as stuck OFF.

P0747 – Pressure Control Solenoid "A" Stuck On

The system detects a condition consistent with the solenoid remaining ON.

These represent opposite types of solenoid-state conditions.

P0746 vs. P0748

P0746 – Performance / Stuck Off

The primary issue is the expected hydraulic or operational result.

P0748 – Electrical

The primary issue is an electrical fault in the solenoid circuit.

This distinction is important during diagnosis.

A vehicle can have a mechanically sticking solenoid with P0746 even though its electrical resistance and wiring are normal.

P0746 vs. P0749

P0746 – Performance / Stuck Off

The solenoid is not producing the expected result or appears stuck OFF.

P0749 – Intermittent

The pressure-control solenoid problem occurs intermittently.

Where Is Pressure Control Solenoid "A"?

The location depends on the transmission.

It may be:

• Inside the transmission

• Installed in the valve body

• Located beneath the transmission pan

• Part of a solenoid pack

• Integrated into a mechatronic unit

Some transmissions allow individual solenoid replacement.

Others require removal or servicing of the valve-body or solenoid assembly.

How to Diagnose P0746

P0746 should be approached as both an electrical and hydraulic diagnostic problem.

1. Scan the transmission control module

Retrieve all codes stored in the TCM.

Check:

• Current codes

• Pending codes

• History codes

• Freeze-frame data

Also record:

• Transmission temperature

• Engine RPM

• Vehicle speed

• Selected gear

• Engine load

• Solenoid command

• Commanded pressure, if available

• Actual pressure, if available

Additional codes can significantly change the diagnostic direction.

2. Analyze freeze-frame data

Determine the conditions under which P0746 occurred.

Look for patterns involving:

• Transmission temperature

• Vehicle speed

• Engine load

• Throttle position

• Selected gear

• Engine RPM

If the code consistently appears during a particular gear change or at a particular temperature, that information is valuable.

3. Check transmission-fluid level

Verify the fluid level according to the manufacturer's specified procedure.

Some transmissions require a specific temperature range for accurate measurement.

4. Inspect the transmission fluid

Check for:

• Burnt odor

• Excessive darkening

• Metal particles

• Clutch material

• Contamination

Severely contaminated fluid may indicate an internal transmission problem.

5. Inspect the external transmission connector

Look for:

• Corrosion

• Bent terminals

• Loose terminals

• Water intrusion

• Fluid contamination

• Damaged connector locks

6. Inspect the wiring harness

Check for:

• Broken wires

• Short circuits

• Chafing

• Melted insulation

• Pinched wiring

• Poor previous repairs

7. Test solenoid resistance

Measure Pressure Control Solenoid "A" resistance and compare it with the manufacturer's specification.

Do not use a universal resistance value because transmission solenoids vary considerably.

An open or shorted coil may indicate a defective solenoid.

However, normal resistance does not prove that the solenoid is mechanically functioning correctly.

8. Check power and ground

Verify that the solenoid receives the correct electrical supply and that the control circuit operates correctly.

9. Check the TCM command

Use suitable diagnostic equipment to determine whether the TCM is commanding the expected solenoid state.

If the TCM command is incorrect, investigate the electrical system or TCM.

If the command is correct but pressure does not respond, the problem may be hydraulic or mechanical.

10. Check the solenoid control signal

Where the system uses PWM control, an oscilloscope can provide valuable information about the command signal.

A multimeter may not reveal every control problem.

11. Perform voltage-drop testing

High resistance in a connector or wire can prevent the solenoid from operating correctly even when basic continuity is present.

12. Test hydraulic pressure

This is one of the most important steps when diagnosing a performance or stuck-OFF condition.

Where a manufacturer's test procedure is available, connect a pressure gauge and compare actual pressure with the specified values.

If commanded pressure increases but actual pressure remains low, further hydraulic diagnosis is required.

13. Command Pressure Control Solenoid "A"

If supported by the diagnostic equipment, command the solenoid through different operating states.

Observe:

• Electrical response

• Engine/transmission response

• Hydraulic pressure response

14. Inspect the valve body

If electrical tests are normal but hydraulic pressure is incorrect, inspect the valve body.

Look for:

• Sticking valves

• Contamination

• Restricted passages

• Worn valve bores

• Internal leakage

15. Inspect the solenoid

A solenoid can have normal electrical resistance but still be mechanically defective.

Check for:

• Sticking

• Contamination

• Restricted movement

• Internal damage

16. Check the transmission pump

If overall line pressure is too low, the pump or another hydraulic component may be responsible rather than the pressure-control solenoid itself.

17. Evaluate internal transmission wear

If the solenoid and valve body are functioning correctly but pressure remains abnormal, inspect:

• Clutch packs

• Seals

• Hydraulic passages

• Internal components

18. Evaluate the TCM

The TCM should be considered after the solenoid, wiring and hydraulic system have been properly tested.

Can a Bad Pressure Control Solenoid Cause P0746?

Yes.

A mechanically stuck, contaminated or internally damaged solenoid can cause P0746.

Can Wiring Cause P0746?

Yes.

Although P0746 is primarily a performance code, incorrect electrical control can prevent the solenoid from producing the required hydraulic response.

Can a Bad Connector Cause P0746?

Yes.

Poor electrical contact can cause incorrect solenoid operation.

Can Dirty Transmission Fluid Cause P0746?

Yes.

Contaminated fluid is a common consideration because debris can cause a solenoid or valve to stick.

Can Low Transmission Fluid Cause P0746?

Yes, potentially.

Low fluid can prevent the transmission from developing the hydraulic pressure required for proper operation.

Can a Bad Valve Body Cause P0746?

Yes.

A worn or sticking valve body can create pressure-control problems even when the solenoid itself is electrically functional.

Can a Bad Transmission Pump Cause P0746?

Yes.

If the pump cannot produce sufficient hydraulic pressure, the TCM may detect a pressure-control performance problem.

Can a Bad TCM Cause P0746?

Yes, but it is generally less common.

The TCM should be considered only after the solenoid, wiring and hydraulic components have been tested.

Can P0746 Cause Harsh Shifting?

Yes.

Incorrect pressure control can result in excessively firm or poorly timed shifts.

Can P0746 Cause Transmission Slipping?

Yes.

Insufficient clutch pressure can cause clutch slip.

Can P0746 Cause Limp Mode?

Yes.

The transmission may enter fail-safe mode when the TCM detects that pressure cannot be controlled reliably.

Can P0746 Cause Transmission Overheating?

Yes.

Clutch slip and repeated abnormal shifting can generate excessive heat.

Can P0746 Damage the Transmission?

Yes, if the problem is ignored.

Continued operation with insufficient or unstable hydraulic pressure can cause:

• Clutch wear

• Excessive heat

• Fluid deterioration

• Valve-body wear

• Internal transmission damage

Common Diagnostic Mistakes With P0746

Replacing the solenoid immediately

The actual problem may be the valve body, fluid, pump or internal transmission.

Assuming P0746 is always electrical

P0746 can be caused by a hydraulic performance problem even when the electrical circuit is functioning correctly.

Checking only solenoid resistance

A solenoid can have correct resistance but still be mechanically stuck.

Ignoring transmission-fluid condition

Contaminated fluid can contribute directly to solenoid and valve-body problems.

Skipping hydraulic pressure testing

If the electrical system is correct, pressure testing may be essential.

Replacing the valve body without checking the solenoid

The solenoid itself may be the problem.

Replacing the TCM too early

The TCM is much less likely than a solenoid, wiring or hydraulic problem.

Assuming the entire transmission has failed

P0746 alone does not prove catastrophic internal transmission damage.

What Is the Correct Repair for P0746?

The correct repair depends entirely on the confirmed cause.

Possible repairs include:

• Replacing Pressure Control Solenoid "A"

• Cleaning or replacing a contaminated solenoid

• Repairing damaged wiring

• Repairing connector terminals

• Cleaning electrical corrosion

• Repairing the internal transmission harness

• Correcting transmission-fluid level

• Replacing incorrect transmission fluid

• Servicing the valve body

• Cleaning restricted hydraulic passages

• Repairing worn valve bores

• Replacing a defective transmission pump

• Repairing internal hydraulic leaks

• Repairing worn clutch or seal components

• Updating TCM software where applicable

• Reprogramming the TCM

• Replacing the TCM if its failure is confirmed

How to Test the Vehicle After Repair

After the repair, the vehicle should be tested under different operating conditions.

Verify that:

• Solenoid "A" responds correctly to TCM commands

• Electrical resistance is within specification

• Power and ground are correct

• Wiring remains stable

• Transmission pressure is within specification

• Actual pressure follows commanded pressure

• Gear changes are smooth

• No slipping occurs

• Drive and Reverse engage normally

• Transmission temperature remains normal

• Limp mode does not activate

• No additional transmission codes appear

• P0746 does not return

The road test should include different gears, speeds, throttle positions and transmission temperatures.

Frequently Asked Questions About P0746

What does P0746 mean?

P0746 means the transmission control system has detected a performance problem with Pressure Control Solenoid "A" or a condition consistent with the solenoid being stuck OFF.

Does P0746 mean the solenoid is bad?

No. The problem can also involve wiring, transmission fluid, the valve body, the transmission pump or internal hydraulic components.

Can a bad solenoid cause P0746?

Yes.

Can dirty transmission fluid cause P0746?

Yes. Contamination can cause the solenoid or valve body to stick.

Can low transmission fluid cause P0746?

Yes, potentially.

Can a bad valve body cause P0746?

Yes.

Can a bad transmission pump cause P0746?

Yes.

Can a bad TCM cause P0746?

Yes, but it is less common.

Can P0746 cause harsh shifting?

Yes.

Can P0746 cause transmission slipping?

Yes.

Can P0746 cause limp mode?

Yes.

Can P0746 cause overheating?

Yes, especially if the fault results in clutch slip.

Can I drive with P0746?

A short trip to a repair facility may be possible if the transmission operates normally. If there is severe slipping, overheating, violent shifting or loss of gears, continued driving should be avoided.

Does P0746 mean the transmission needs to be replaced?

No. A solenoid, wiring problem, contaminated fluid, valve-body issue or hydraulic-pressure problem may be responsible.

Final Thoughts on P0746

P0746 – Pressure Control Solenoid "A" Performance / Stuck Off indicates that the transmission control system has detected that Pressure Control Solenoid "A" is not producing the expected hydraulic response or is behaving as though it is stuck OFF.

The most important point is that P0746 is not necessarily an electrical failure.

A proper diagnostic process should distinguish between an electrical control problem and a hydraulic/mechanical problem.

A logical diagnostic sequence is:

Scan Tool → Freeze-Frame → Fluid Level / Condition → Connector → Wiring → Solenoid Electrical Test → TCM Command → Solenoid Operation → Hydraulic Pressure → Valve Body → Pump → Internal Transmission → TCM

If the solenoid receives the correct command but transmission pressure remains incorrect, the investigation should move toward the solenoid itself, valve body, hydraulic passages, transmission pump or internal transmission components.

P0746 should not automatically lead to a solenoid replacement or complete transmission replacement. Accurate diagnosis is essential because the underlying problem can range from a relatively simple solenoid or fluid issue to a more serious hydraulic or internal transmission fault.