P0907 Gate Select Position Circuit High

The P0907 trouble code is an OBD-II diagnostic trouble code related to the gate select position circuit.

P0907 – Gate Select Position Circuit High

This code means that the transmission control module (TCM) has detected a higher-than-expected voltage or signal from the gate select position circuit.

The gate select position circuit provides the TCM with information about the position of the transmission's selector mechanism. This information is especially important in automated manual transmissions (AMT), dual-clutch transmissions (DCT), and other electronically controlled transmissions.

When the TCM detects that the position signal is above the expected range, it may store P0907.

Possible causes include:

• Faulty gate select position sensor

• Short to voltage

• Damaged signal wire

• Incorrect sensor reference voltage

• Faulty actuator position sensor

• Corroded electrical connector

• Loose connector terminal

• Damaged wiring harness

• Poor electrical connection

• Incorrect sensor installation

• Mechanical selector problem

• Faulty actuator

• Mechatronic unit failure

• Transmission control module fault

• Incorrect calibration

• Low-quality previous repair

The exact system varies by manufacturer, so the vehicle-specific wiring diagram and sensor specifications should always be used.

What Does P0907 Mean?

P0907 – Gate Select Position Circuit High

The transmission control module needs to know exactly where the selector mechanism is located.

A simplified system can be represented as:

Gate Select Mechanism → Position Sensor → TCM

The position sensor generates an electrical signal corresponding to the selector's position.

The TCM continuously monitors this signal.

If the signal becomes higher than the specified range, the TCM can interpret this as a circuit-high condition and store P0907.

For example:

Normal position signal → Signal voltage increases abnormally → TCM detects excessive voltage → P0907

The code therefore does not necessarily mean that the transmission is mechanically damaged.

The problem may be entirely electrical.

What Does “Circuit High” Mean?

The word “High” refers to the electrical signal or voltage being higher than the expected value.

It does not mean:

• High transmission fluid level

• High transmission pressure

• High engine RPM

• High gear

• High transmission temperature

For example, a position sensor may normally produce a variable voltage as the selector moves.

If the signal becomes higher than the TCM expects, the module can set P0907.

One possible cause is a short to voltage:

Signal wire → Short to power → Signal voltage becomes too high → P0907

However, a short to voltage is only one possible cause. A defective sensor, incorrect reference voltage, wiring problem or control-module fault can also produce the code.

What Is a Gate Select Position Sensor?

The gate select position sensor monitors the position of the transmission's selector mechanism.

The sensor tells the TCM whether the selector is:

• In the correct gate

• Moving between gates

• At the requested position

• Outside the expected range

Depending on the transmission design, the sensor may be integrated into:

• Gate select actuator

• Selector mechanism

• Gear position sensor assembly

• Mechatronic unit

Different manufacturers may use different sensor technologies, including potentiometers, Hall-effect sensors or magnetic position sensors.

Symptoms of P0907

The symptoms can vary depending on how high the position signal is and whether the TCM can still determine the selector's actual position.

Possible symptoms include:

• Check Engine Light

• Transmission warning light

• Difficulty selecting gears

• Delayed gear engagement

• Harsh shifting

• Incorrect gear indication

• Transmission stuck in one gear

• Transmission stuck in Neutral

• Loss of Reverse

• Loss of certain gears

• Limp mode

• Intermittent or incorrect gear selection

• Vehicle refusing to move

• Clutch engagement problems

• Transmission warning message

In some cases, the transmission may continue working relatively normally until the signal becomes sufficiently abnormal to prevent reliable gear selection.

Common Causes of P0907

Faulty gate select position sensor

The sensor may have an internal electrical failure that causes its output to remain too high.

A damaged sensor can send an incorrect position signal to the TCM.

Short to voltage

The sensor signal wire may accidentally contact a power supply.

For example:

Signal wire → Insulation damage → Contact with voltage → High signal → P0907

Incorrect reference voltage

Many position sensors receive a regulated reference voltage from the control module.

If the reference voltage is incorrect, the sensor output may also become abnormal.

Damaged signal wire

A damaged harness can allow the signal wire to contact another circuit carrying voltage.

Corroded connector

Corrosion can alter electrical characteristics and cause abnormal sensor readings.

Loose connector terminal

A poorly seated terminal can create unstable or incorrect sensor signals.

Faulty actuator

The actuator may not move the selector correctly, causing the position sensor to report an unexpected value.

Mechanical selector problem

A damaged or incorrectly positioned selector mechanism can result in a sensor value that does not correspond to the expected gate.

Incorrect sensor installation

If a sensor or actuator has been installed incorrectly, its operating range may not correspond to the TCM's learned values.

Incorrect calibration

Some electronically controlled transmissions require position calibration after repairs.

Without proper adaptation, the TCM may interpret the position signal as abnormal.

Mechatronic unit failure

If the sensor and actuator are integrated into the mechatronic unit, an internal electronic fault can produce P0907.

Transmission control module fault

A damaged TCM input circuit can incorrectly interpret the position signal as too high.

The TCM should not be replaced until the sensor circuit has been properly tested.

Can Low Transmission Fluid Cause P0907?

Low transmission fluid does not normally cause P0907 directly.

P0907 is primarily an electrical position-signal fault.

However, some automated transmissions use hydraulic systems to operate actuators.

Low fluid can contribute to:

• Poor actuator operation

• Slow gear engagement

• Hydraulic pressure problems

• Mechatronic malfunction

Therefore, fluid level may still be checked during diagnosis, but an electrical circuit test remains essential.

Can Dirty Transmission Fluid Cause P0907?

Dirty transmission fluid can contribute to:

• Valve sticking

• Mechatronic problems

• Hydraulic restrictions

• Poor gear engagement

• Actuator problems

However, contaminated fluid does not normally cause a high electrical position signal directly.

If P0907 is present, the position sensor circuit should be tested rather than assuming that a fluid change will solve the problem.

Is P0907 a Serious Transmission Problem?

P0907 can be a serious transmission control problem.

The TCM relies on accurate selector position information to determine which gear can safely be engaged.

If the position signal is incorrect, the transmission may not know the actual selector position.

This can result in:

• Limp mode

• Loss of Reverse

• Loss of certain gears

• Incorrect gear selection

• Transmission stuck in Neutral

• Transmission stuck in one gear

• Complete loss of drive

However, P0907 does not automatically indicate internal transmission damage.

A faulty sensor or damaged wire can cause the code without any internal gearbox failure.

Can You Drive With P0907?

If the vehicle shifts normally and only the warning light is present, it may be possible to drive carefully to a repair facility.

However, P0907 should be diagnosed promptly.

Do not continue driving if:

• The transmission cannot select gears

• The vehicle remains in Neutral

• Reverse is unavailable

• Gear selection is unpredictable

• The transmission enters limp mode

• The vehicle loses drive

• Severe shifting occurs

• The gear indicator does not match the selected gear

If the transmission cannot reliably determine or select the correct gear, towing the vehicle is generally safer.

P0907 vs. P0906

These two codes are direct opposites in terms of the electrical condition being detected.

P0906 – Gate Select Position Circuit Low

The TCM detects a lower-than-expected position signal.

P0907 – Gate Select Position Circuit High

The TCM detects a higher-than-expected position signal.

In simple terms:

P0906 → Signal too low

P0907 → Signal too high

Both codes can originate from wiring, sensor, connector or control-module problems.

P0907 vs. P0908

P0907 – Gate Select Position Circuit High

The position signal is above the expected electrical range.

P0908 – Gate Select Position Circuit Intermittent

The position signal is unstable or intermittently lost.

The distinction is important.

A permanently high signal points toward a high-voltage condition, while P0908 requires investigation into an intermittent connection or signal dropout.

P0907 vs. P0909

P0907 – Gate Select Position Circuit High

Focuses on a high electrical signal from the position circuit.

P0909 – Gate Select Control Error

Indicates a broader problem with gate selection control.

A faulty position sensor can potentially cause both codes because incorrect position information can prevent the TCM from controlling the gate selection system correctly.

P0907 vs. P0910

P0907 concerns the gate select position circuit.

P0910 – Gate Select Actuator Circuit/Open concerns an open circuit involving the gate select actuator.

Therefore, P0907 is generally associated with position feedback, while P0910 points toward an interruption in the actuator control circuit.

How to Diagnose P0907

A systematic diagnosis is important because a high signal does not automatically mean the sensor itself has failed.

1. Scan the transmission control system

Use a professional diagnostic scanner to check:

• TCM

• PCM

• Mechatronic unit

• Transmission-related modules

Record all stored and pending codes.

Other sensor or actuator codes can help identify a common cause.

2. Check freeze-frame data

Review:

• Engine RPM

• Vehicle speed

• Transmission temperature

• Selected gear

• Commanded gear

• Actual gear

• Battery voltage

• Gate position

• Position sensor value

This helps determine when the high-signal condition occurred.

3. Monitor live position data

Observe the gate select position value while operating the transmission.

Compare the:

Commanded position

with the:

Actual position

A sensor value that remains excessively high or suddenly jumps upward can indicate an electrical or sensor problem.

4. Check the sensor reference voltage

Verify that the sensor receives the correct reference voltage according to the manufacturer's specifications.

An incorrect reference voltage can affect the sensor signal.

5. Check the sensor ground

A poor sensor ground can cause abnormal signal readings.

Perform appropriate voltage and ground tests rather than relying only on a continuity check.

6. Inspect the signal wire

Check for:

• Short to voltage

• Damaged insulation

• Chafing

• Pinched wiring

• Incorrect previous repairs

• Contact with another power circuit

7. Inspect the connector

Look for:

• Corrosion

• Bent pins

• Loose terminals

• Moisture

• Oil contamination

• Damaged connector locking mechanism

8. Test the position sensor

Depending on the sensor design, check:

• Reference voltage

• Ground

• Signal voltage

• Resistance

• Signal response during selector movement

The signal should change according to the manufacturer's specifications.

9. Perform a wiggle test

If appropriate, move the wiring harness gently while monitoring the sensor signal.

If the signal changes unexpectedly, the harness or connector may have an intermittent or poor connection.

10. Test the gate select actuator

Verify that the actuator moves the selector correctly.

A mechanical actuator problem can cause the selector to remain in an unexpected position.

11. Inspect the mechanical selector

Check for:

• Binding

• Excessive play

• Worn components

• Damaged selector shaft

• Damaged shift fork

• Mechanical obstruction

12. Check the mechatronic unit

If the sensor is integrated into the mechatronic assembly, additional testing may be required.

13. Check battery and charging voltage

Verify:

• Battery condition

• Charging voltage

• Main grounds

• Transmission power supply

Incorrect system voltage can cause electronic transmission faults.

14. Check calibration

If the transmission supports position learning or adaptation, verify that the gate select position calibration is correct.

Perform the manufacturer's adaptation procedure where necessary.

15. Evaluate the TCM

If the sensor, wiring, reference voltage, ground, actuator and mechanical selector all test correctly, the TCM may require further diagnosis.

Why P0907 Can Be Misdiagnosed

A common mistake is assuming:

“Circuit High = Bad Sensor.”

This is not necessarily true.

For example:

Signal wire shorted to voltage → Sensor signal becomes high → P0907

The sensor itself may be perfectly functional.

Another possibility is:

Incorrect reference voltage → Sensor output becomes abnormal → P0907

Or:

Incorrect selector position → Position sensor reports an unexpectedly high value → P0907

Therefore, the complete circuit should be tested before replacing the sensor.

P0907 After Transmission Repair

If P0907 appeared immediately after transmission work, inspect everything that was disconnected or moved.

Pay particular attention to:

• Gate select position sensor

• Sensor connector

• Transmission wiring

• Mechatronic connectors

• Actuator

• Selector mechanism

• Ground connections

Also verify whether a gate position calibration or transmission adaptation is required after the repair.

A connector that is not fully seated can create incorrect sensor readings.

P0907 After Transmission Replacement

If P0907 appears after replacing the transmission, check:

• Correct transmission installation

• Correct position sensor

• Sensor compatibility

• Connector compatibility

• Wiring connections

• TCM communication

• Mechatronic configuration

• Software compatibility

• Position calibration

• Required adaptation procedures

A replacement transmission may require electronic initialization before the TCM can correctly interpret the selector position.

Can P0907 Damage the Transmission?

P0907 itself does not automatically mean that the transmission has internal damage.

However, incorrect selector position information can cause the transmission control system to make incorrect decisions.

If the transmission repeatedly attempts to engage a gear while the selector position is incorrect, additional stress may occur in:

• Actuators

• Clutches

• Selector components

• Transmission gears

• Mechatronic components

Therefore, the fault should be repaired before prolonged driving.

Common Diagnostic Mistakes With P0907

Common mistakes include:

• Replacing the position sensor immediately

• Ignoring the signal wire

• Failing to check for a short to voltage

• Ignoring sensor reference voltage

• Ignoring sensor ground

• Not checking connector terminals

• Failing to monitor live data

• Ignoring mechanical selector problems

• Replacing the actuator without testing it

• Replacing the TCM prematurely

• Skipping calibration

• Assuming the complete transmission is damaged

What Is the Correct Repair for P0907?

The correct repair depends on the confirmed cause.

Possible repairs include:

• Replacing the gate select position sensor

• Repairing a short to voltage

• Repairing damaged wiring

• Replacing damaged connector terminals

• Cleaning or replacing corroded connectors

• Repairing sensor power or ground connections

• Repairing or replacing the gate select actuator

• Repairing the mechanical selector

• Replacing worn selector components

• Repairing or replacing the mechatronic unit

• Correcting transmission fluid level where applicable

• Performing position sensor calibration

• Performing actuator adaptation

• Performing transmission relearn procedures

• Updating TCM software where applicable

• Replacing the TCM only after proper diagnosis

After the repair, clear the codes and perform a complete transmission test.

The vehicle should be driven through the relevant gear-selection range to confirm that the position signal remains within specification.

Final Thoughts on P0907

P0907 – Gate Select Position Circuit High indicates that the transmission control module has detected a higher-than-expected electrical signal from the gate select position circuit.

The most important areas to investigate are the gate select position sensor, signal wiring, reference voltage, sensor ground, connectors, actuator, mechanical selector, mechatronic unit and TCM.

A circuit-high code does not automatically mean that the position sensor is defective. A short to voltage, damaged wiring, incorrect reference voltage, poor connector or control-module problem can produce the same fault.

The best diagnostic approach is to monitor the live position signal, compare commanded and actual selector positions, verify reference voltage and ground, inspect the signal circuit for a short to voltage, test the sensor and inspect the mechanical selector.

P0907 does not automatically mean that the complete transmission needs to be replaced. In many cases, the problem can be resolved by repairing wiring, replacing a faulty sensor or connector, correcting calibration, repairing the actuator or addressing a mechanical selector problem.