P0772 Shift Solenoid "E" Stuck On

The P0772 trouble code is an OBD-II diagnostic trouble code related to Shift Solenoid "E" in an automatic transmission.

P0772 – Shift Solenoid "E" Stuck On

This code means that the Transmission Control Module (TCM) has detected that Shift Solenoid "E" is remaining in an ON or active condition when it should not be.

Shift Solenoid "E" is an electronically controlled hydraulic valve used to direct transmission fluid through specific hydraulic circuits. If the solenoid stays activated, the transmission may receive fluid pressure at the wrong time.

This can cause incorrect gear changes, harsh shifting, delayed engagement, slipping, unexpected downshifts or limp mode.

Importantly, P0772 does not always mean that the solenoid's electrical coil is defective. The solenoid can be mechanically stuck, the valve body can have a problem, the wiring can be shorted, or contaminated transmission fluid can prevent the solenoid from returning to its normal position.

What Does P0772 Mean?

An automatic transmission uses hydraulic pressure to control clutches and other internal components.

The TCM controls this pressure through electronically operated solenoids.

Under normal conditions:

TCM Command → Solenoid "E" → Hydraulic Fluid Flow → Correct Hydraulic Circuit → Correct Gear Operation

When the TCM determines that Solenoid "E" remains active when it should be turned off, it can store:

P0772 – Shift Solenoid "E" Stuck On

The important part of this code is "stuck on."

The TCM is essentially detecting that the solenoid is not responding to its OFF command as expected.

What Is Shift Solenoid "E"?

Shift Solenoid "E" is a transmission-control solenoid that regulates the flow of automatic transmission fluid.

Its exact function depends on the transmission design.

Depending on the vehicle, Solenoid "E" may influence:

• Gear selection

• Clutch application

• Brake application

• Shift valves

• Hydraulic pressure

• Specific transmission gear combinations

There is no universal rule stating that Solenoid "E" controls one particular gear in every transmission.

The manufacturer's transmission documentation is needed to determine its exact function.

What Does "Stuck On" Mean?

"Stuck on" can describe more than one type of problem.

The solenoid may be electrically commanded on continuously, or it may be mechanically unable to return to the OFF position.

For example, the TCM may command:

ON → OFF → ON → OFF

But the solenoid may effectively remain:

ON → ON → ON → ON

This can happen because of:

• A shorted control circuit

• A failed solenoid

• A stuck solenoid plunger

• Contaminated transmission fluid

• Debris inside the valve body

• A damaged valve

• A failed TCM driver

Therefore, both the electrical and hydraulic/mechanical sides need to be considered.

Symptoms of P0772

The symptoms depend on the transmission and the hydraulic circuit controlled by Solenoid "E".

Common symptoms can include:

• Check Engine Light

• Transmission warning light

• Harsh shifting

• Erratic shifting

• Delayed gear changes

• Unexpected downshifts

• Transmission slipping

• Shift flare

• Incorrect gear selection

• Transmission stuck in one gear

• Delayed Drive engagement

• Delayed Reverse engagement

• Limp mode

• Reduced acceleration

• Poor fuel economy

• Increased transmission temperature

Some vehicles may initially show only the warning light.

What Does P0772 Feel Like While Driving?

Harsh shifts

If Solenoid "E" maintains hydraulic pressure when it should not, a clutch or brake may apply too aggressively.

Unexpected downshifting

The transmission may select a lower gear at an inappropriate time.

Delayed shifting

The transmission may hesitate because the hydraulic circuit is not operating according to the TCM's commands.

Transmission slipping

Incorrect hydraulic control can prevent clutches from applying correctly.

Shift flare

Engine RPM may rise temporarily during a gear change.

Limp mode

The TCM may limit the transmission to a smaller number of gears to prevent further damage.

Common Causes of P0772

Faulty Shift Solenoid "E"

The solenoid may have an internal mechanical or electrical failure.

Solenoid mechanically stuck

Contaminants can prevent the solenoid plunger from moving freely.

Shorted wiring

A short to power or another circuit can keep the solenoid electrically activated.

Damaged connector

A connector problem can interfere with proper solenoid control.

Corroded terminals

Corrosion can alter the electrical characteristics of the circuit.

Contaminated transmission fluid

Dirty fluid can cause solenoids and valve-body components to stick.

Incorrect transmission fluid

Incorrect fluid characteristics can affect hydraulic operation.

Valve-body problem

A sticking valve or worn valve bore can cause hydraulic pressure to remain active.

Debris in hydraulic passages

Metal particles, clutch material or other contamination can interfere with valve operation.

TCM driver fault

The TCM may incorrectly continue supplying the solenoid control signal.

Low system voltage

Voltage problems can sometimes cause abnormal transmission control, although this is not the most typical cause of a stuck-on code.

Is P0772 Serious?

Yes, P0772 can be a serious transmission fault.

A solenoid that remains active can cause the transmission to apply hydraulic pressure incorrectly.

If the problem is ignored, repeated incorrect shifts or clutch engagement can lead to:

• Clutch wear

• Excessive heat

• Hydraulic-system stress

• Increased internal transmission wear

The vehicle may still drive, but that does not mean the transmission is operating safely.

Can You Drive With P0772?

If the vehicle has only a warning light and still shifts normally, a short trip to a repair facility may be possible.

However, continued driving is not recommended if there is:

• Severe slipping

• Violent shifting

• Loss of gears

• Transmission overheating

• Limp mode

• Loss of Drive or Reverse

If the transmission is behaving aggressively or slipping significantly, it is safer to stop driving and have the vehicle inspected.

P0772 vs. P0771

These codes both concern Shift Solenoid "E" but describe different problems.

P0771 – Shift Solenoid "E" Performance / Stuck Off

The solenoid is not operating as expected or is behaving as though it is stuck off.

P0772 – Shift Solenoid "E" Stuck On

The system detects that the solenoid is remaining active when it should not.

This distinction is important because the diagnostic direction is different.

P0772 vs. P0773

P0772 – Shift Solenoid "E" Stuck On

The solenoid is detected as remaining active.

P0773 – Shift Solenoid "E" Electrical Malfunction

The TCM detects an electrical problem in the Solenoid "E" circuit.

A P0773 diagnosis should concentrate heavily on electrical testing, while P0772 requires both electrical and mechanical/hydraulic investigation.

P0772 vs. P0774

P0774 – Shift Solenoid "E" Intermittent

The solenoid or its circuit works inconsistently.

P0772 – Shift Solenoid "E" Stuck On

The system detects a persistent active condition.

If P0772 is present, the technician should determine whether the solenoid is being commanded on continuously or is physically stuck.

P0772 vs. P0770

P0770 – Shift Solenoid "E" Malfunction

A general malfunction involving Solenoid "E".

P0772 – Shift Solenoid "E" Stuck On

A more specific condition in which the solenoid is detected as remaining active.

Where Is Shift Solenoid "E"?

The location varies between transmission designs.

It may be:

• Inside the transmission

• Installed in the valve body

• Located beneath the transmission pan

• Integrated into a solenoid pack

• Integrated into a mechatronic unit

Some transmissions allow the individual solenoid to be replaced.

Other transmissions require removal or servicing of the valve body or complete solenoid assembly.

How to Diagnose P0772

A proper diagnosis should determine why Solenoid "E" remains active.

1. Scan the TCM

Use a professional diagnostic scanner to retrieve all transmission codes.

Record:

• Stored codes

• Pending codes

• Freeze-frame data

• Commanded gear

• Actual gear

• Solenoid commands

• Transmission temperature

• Input speed

• Output speed

Other codes may help identify the underlying problem.

2. Check the freeze-frame data

Determine under what conditions P0772 was stored.

Look at:

• Vehicle speed

• Engine RPM

• Transmission temperature

• Throttle position

• Engine load

• Selected gear

• Battery voltage

This can reveal whether the problem happens during a particular shift.

3. Determine whether the TCM is commanding the solenoid ON

This is one of the most important diagnostic steps.

If the TCM is not commanding Solenoid "E" ON, but the solenoid remains electrically active, suspect:

• Shorted wiring

• Short to power

• Faulty solenoid

• TCM driver problem

If the TCM is intentionally commanding it ON, the problem may instead be related to how the transmission responds to that command.

4. Inspect the wiring

Look for:

• Chafed wires

• Broken wires

• Melted insulation

• Short circuits

• Poor previous repairs

• Wiring contacting hot components

5. Inspect the connector

Check for:

• Corrosion

• Bent pins

• Loose terminals

• Water intrusion

• Transmission-fluid contamination

• Damaged connector housing

6. Test the electrical circuit

Check the circuit for:

• Short to power

• Short to ground

• Open circuit

• Excessive resistance

• Incorrect voltage

Follow the manufacturer's wiring diagram.

7. Measure solenoid resistance

Measure the resistance of Shift Solenoid "E" and compare it with the manufacturer's specification.

An abnormal reading may indicate an internal solenoid problem.

A normal resistance reading, however, does not prove that the solenoid is mechanically functioning correctly.

8. Check the solenoid control signal

Use suitable diagnostic equipment to determine whether the TCM is sending a continuous command.

An oscilloscope can be particularly useful for PWM-controlled systems.

9. Check the transmission fluid

Inspect:

• Fluid level

• Fluid condition

• Correct specification

• Burnt smell

• Metal particles

• Clutch material

Contaminated fluid can cause mechanical sticking.

10. Inspect the solenoid mechanically

If the electrical circuit is functioning correctly, the solenoid itself should be checked for mechanical sticking.

A solenoid can have acceptable electrical resistance but still fail mechanically.

11. Inspect the valve body

The valve body should be considered if the solenoid circuit is good.

Check for:

• Sticking valves

• Worn valve bores

• Contamination

• Debris

• Restricted passages

• Internal hydraulic leakage

12. Check hydraulic pressure

Measure hydraulic pressure according to the manufacturer's procedure.

Abnormal pressure can help identify problems in the hydraulic circuit.

13. Check speed sensors

Monitor input and output shaft speeds.

Incorrect speed information can cause the TCM to make inappropriate shift decisions or incorrectly evaluate transmission behavior.

14. Evaluate the TCM

If the solenoid and wiring are verified, the TCM driver circuit may need to be tested.

A failed TCM driver can keep a solenoid energized.

Can a Bad Solenoid Cause P0772?

Yes.

A defective Shift Solenoid "E" may remain mechanically or electrically active.

Can Wiring Cause P0772?

Yes.

A shorted control wire can keep the solenoid energized even when the TCM has commanded it OFF.

Can a Bad Connector Cause P0772?

Yes, although a connector problem is more commonly associated with intermittent or open-circuit conditions.

A damaged connector can nevertheless create abnormal electrical conditions.

Can Dirty Transmission Fluid Cause P0772?

Yes.

Contaminated fluid can cause the solenoid's internal plunger to stick.

Debris can also interfere with valve-body operation.

Can Low Transmission Fluid Cause P0772?

Usually not as a direct cause of a "stuck on" electrical condition.

Low fluid is more likely to produce hydraulic-pressure and shifting problems.

However, the fluid level and condition should still be checked during diagnosis.

Can a Bad Valve Body Cause P0772?

Yes.

A valve-body valve can become stuck because of contamination or wear.

This can create hydraulic behavior consistent with a solenoid remaining active.

Can a Bad TCM Cause P0772?

Yes.

If the TCM's internal driver circuit fails, it may continuously energize Solenoid "E".

However, the TCM should not be replaced until the external circuit and solenoid have been tested.

Can P0772 Cause Harsh Shifting?

Yes.

Incorrect solenoid operation can cause hydraulic pressure to be applied at the wrong time or with the wrong intensity.

Can P0772 Cause Transmission Slipping?

Yes.

If the affected hydraulic circuit controls a clutch, incorrect pressure can result in clutch slip.

Can P0772 Cause Limp Mode?

Yes.

The TCM may activate a fail-safe strategy to prevent further transmission damage.

Can P0772 Cause Transmission Overheating?

Yes, potentially.

Incorrect clutch application and repeated abnormal shifts can increase transmission temperature.

Can P0772 Damage the Transmission?

Yes, especially if the vehicle is driven for a long time while slipping or shifting incorrectly.

A stuck-on solenoid can cause repeated incorrect hydraulic operation, which can accelerate clutch and transmission-component wear.

Can P0772 Be Caused by Low Battery Voltage?

It is possible for low system voltage to create transmission-control problems, but it is not one of the primary causes of a true stuck-on condition.

Battery and charging voltage should still be verified during diagnosis.

Common Diagnostic Mistakes With P0772

Replacing Shift Solenoid "E" immediately

The solenoid may be functioning correctly while the control wire is shorted.

Assuming "stuck on" means mechanically stuck

The solenoid may actually be electrically energized continuously.

Testing only resistance

Resistance does not prove that the solenoid moves correctly.

Ignoring the TCM command

The technician needs to determine whether the TCM is actually requesting the solenoid to remain ON.

Ignoring the valve body

A hydraulic valve can remain stuck even if the electrical solenoid is functioning.

Ignoring transmission-fluid contamination

Debris can cause both solenoid and valve-body problems.

Replacing the TCM too early

A shorted wire or faulty solenoid can make the TCM appear to be the problem.

What Is the Correct Repair for P0772?

The correct repair depends on the confirmed cause.

Possible repairs include:

• Replacing Shift Solenoid "E"

• Repairing a shorted control wire

• Repairing damaged wiring

• Replacing damaged connector terminals

• Cleaning connector corrosion

• Repairing water intrusion

• Correcting transmission-fluid level

• Replacing contaminated transmission fluid

• Servicing the valve body

• Cleaning blocked hydraulic passages

• Repairing hydraulic pressure problems

• Repairing internal transmission components

• Updating TCM software where applicable

• Reprogramming the TCM

• Replacing the TCM if its driver circuit is confirmed defective

How to Test the Vehicle After Repair

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

Verify that:

• Shift Solenoid "E" responds correctly

• The solenoid turns OFF when commanded

• The electrical signal is correct

• Wiring remains stable

• Connectors remain secure

• Transmission fluid is at the correct level

• Gear changes are smooth

• No slipping occurs

• Engine RPM behaves normally during shifts

• Transmission temperature remains normal

• Limp mode does not activate

• No additional transmission codes appear

• P0772 does not return

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

Frequently Asked Questions About P0772

What does P0772 mean?

P0772 means the transmission control system has detected that Shift Solenoid "E" is stuck in an ON or active condition.

Does P0772 mean Shift Solenoid "E" is bad?

Not necessarily. A shorted wire, valve-body problem or TCM fault can produce the same condition.

Can a shorted wire cause P0772?

Yes.

Can dirty transmission fluid cause P0772?

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

Can a bad valve body cause P0772?

Yes.

Can a bad TCM cause P0772?

Yes, although it should be considered only after the solenoid and wiring have been tested.

Can P0772 cause harsh shifting?

Yes.

Can P0772 cause transmission slipping?

Yes.

Can P0772 cause limp mode?

Yes.

Can P0772 cause overheating?

Yes, particularly if it causes clutch slip or repeated incorrect shifts.

Can I drive with P0772?

If the transmission is operating normally, a short trip for diagnosis may be possible. Severe slipping, violent shifting, overheating or loss of gears are reasons to stop driving.

Does P0772 mean the transmission needs to be replaced?

No. The problem may be limited to a solenoid, wiring, connector or valve-body component.

Final Thoughts on P0772

P0772 – Shift Solenoid "E" Stuck On indicates that the transmission control system has detected that Shift Solenoid "E" is remaining active when it should not be.

The most important diagnostic question is:

Is the solenoid actually stuck, or is something keeping it electrically energized?

A proper diagnostic sequence is:

Scan Data → TCM Command → Wiring → Connector → Solenoid → Transmission Fluid → Valve Body → Hydraulic Pressure → TCM

This distinction is critical. If the TCM is commanding the solenoid OFF but the circuit remains energized, an electrical fault becomes highly likely. If the electrical control is correct but hydraulic operation remains abnormal, the solenoid or valve body may be mechanically stuck.

Therefore, P0772 should not automatically lead to solenoid replacement or transmission replacement. Accurate electrical and hydraulic testing can often identify the actual source of the problem before unnecessary major repairs are performed.