P0706 Transmission Range Sensor "A" Circuit Range / Performance

The P0706 – Transmission Range Sensor "A" Circuit Range / Performance diagnostic trouble code (DTC) indicates that the transmission control module (TCM) has detected a range or performance problem with the Transmission Range Sensor (TRS) "A" circuit.

The Transmission Range Sensor tells the vehicle which position the transmission selector is in, such as Park (P), Reverse (R), Neutral (N), and Drive (D). Depending on the vehicle, the system may also monitor manual mode, low ranges, or other selector positions.

The important part of P0706 is “Range / Performance.” This generally means the signal is present, but the TCM determines that the signal is outside the expected range, does not correspond correctly to the selected position, or does not behave as expected.

This makes P0706 different from a simple high-input or low-input code.

What Does P0706 Mean?

In simple terms:

The TCM cannot reliably match the electrical signal from Transmission Range Sensor "A" with the actual transmission selector position.

The normal process is:

Gear selector → Range sensor → Electrical signal → TCM → Transmission position identified

With P0706, something is wrong with the expected relationship between the selector position and the sensor signal.

For example, the driver may select Drive, but the TCM receives a signal that does not fall within the expected Drive range.

What Is the Transmission Range Sensor?

The Transmission Range Sensor (TRS) detects the position of the transmission selector.

Depending on the vehicle, it may be:

• Mounted externally on the transmission

• Mounted around the transmission selector shaft

• Integrated into an internal transmission harness

• Integrated into a valve-body assembly

• Part of an electronic shift-by-wire system

The sensor provides information used by the TCM and other control modules.

It can affect:

• Gear selection

• Shift strategy

• Starter authorization

• Reverse lights

• Instrument-cluster gear indication

• Transmission safety functions

• Manual mode operation

Why Is the Range Sensor Important?

The transmission controller needs to know exactly what the driver has selected.

For example:

P → Start authorization

R → Reverse gear and reverse-light logic

N → Neutral operation

D → Automatic forward shifting

If the range sensor signal does not match the selected position, the TCM may not know which operating strategy to use.

Symptoms of P0706

P0706 can produce different symptoms depending on the vehicle and the severity of the mismatch.

Possible symptoms include:

Check Engine Light

The malfunction indicator lamp may illuminate.

Incorrect gear displayed

The instrument cluster may show the wrong transmission position.

Flashing gear indicator

Some vehicles flash the PRND indicator when the transmission range is considered invalid.

Transmission does not recognize the selected gear

The vehicle may not correctly respond to P, R, N, or D.

Delayed engagement

Drive or Reverse may engage slowly.

Harsh shifting

The TCM may change its strategy when the range signal is unreliable.

Transmission stuck in one gear

A protective strategy may limit available gears.

Limp mode

The transmission may enter fail-safe operation.

Intermittent no-start

The system may fail to recognize Park or Neutral.

Reverse-light problems

Depending on the vehicle, an incorrect range signal can affect the reverse lights.

What Causes P0706?

P0706 can have several causes.

Faulty Transmission Range Sensor

The sensor may produce an incorrect signal for one or more positions.

Sensor misalignment

The sensor may not be correctly synchronized with the transmission selector shaft.

Worn selector mechanism

Excessive mechanical play can cause the sensor position to vary.

Shift cable misadjustment

On cable-operated transmissions, incorrect adjustment can cause the selected position and actual transmission position to disagree.

Damaged shift cable

A stretched or damaged cable can create a range mismatch.

Damaged wiring

The sensor signal may be affected by broken or damaged wiring.

Corroded connector

Corrosion can alter the electrical characteristics of the circuit.

Loose terminals

Poor terminal contact can produce an unreliable signal.

Short to ground or voltage

The signal can be pulled away from its expected range.

Internal transmission wiring fault

Some vehicles have the range-sensor circuitry inside the transmission.

Incorrect reference voltage

A sensor requiring a reference voltage may behave incorrectly if that voltage is outside specifications.

Poor ground

An incorrect ground can affect the sensor signal.

TCM fault

A TCM input problem is possible, but it should generally be considered after the sensor and wiring have been verified.

Can a Bad Range Sensor Cause P0706?

Yes.

A range sensor can wear internally and begin producing inaccurate signals.

The sensor may correctly identify some positions while producing an incorrect signal in another.

For example:

P → correct

R → correct

N → incorrect

D → correct

This type of position-specific failure can trigger P0706.

Can Sensor Misalignment Cause P0706?

Yes.

This is an important possibility.

The range sensor must often be correctly aligned with the transmission selector shaft.

If it is installed or adjusted incorrectly, the electrical signal may fall between the expected ranges.

The TCM may then interpret the selected position as invalid or incorrect.

Can a Shift Cable Cause P0706?

Yes, on vehicles equipped with a mechanical shift cable.

The cable connects the cabin selector to the transmission mechanism.

If it is:

• Stretched

• Misadjusted

• Damaged

• Loose

the selector position and actual transmission position may not match.

For example, the driver may place the shifter in D, while the transmission selector shaft remains between two positions.

This can create a range/performance fault.

Can Wiring Cause P0706?

Yes.

Inspect the wiring for:

• Broken conductors

• Chafing

• Corrosion

• High resistance

• Short to ground

• Short to voltage

• Poor previous repairs

• Loose terminals

The wiring should be tested according to the manufacturer's circuit diagram.

Can the Connector Cause P0706?

Yes.

A connector can create an abnormal range signal even when the sensor itself is functioning correctly.

Inspect for:

• Bent pins

• Loose terminals

• Corrosion

• Moisture

• Transmission-fluid contamination

• Damaged connector locks

Can Low Transmission Fluid Cause P0706?

Usually not directly.

Low fluid does not normally cause the range sensor's electrical signal to become invalid.

However, low fluid can produce transmission symptoms such as:

• Delayed engagement

• Slipping

• Harsh shifting

• Overheating

Those issues should be diagnosed separately.

Does P0706 Mean the Transmission Is Bad?

No.

P0706 does not automatically indicate internal transmission damage.

The problem can be caused by a relatively simple issue such as:

• Sensor adjustment

• Shift cable adjustment

• Wiring

• Connector

• Range sensor

Internal mechanical transmission failure should not be assumed without additional evidence.

Can P0706 Prevent the Vehicle From Starting?

Yes.

The starting system often requires confirmation that the transmission is in Park or Neutral.

If the TCM receives a range signal that does not correspond to a valid position, it may prevent starter operation.

This can create an intermittent or complete no-start condition.

Can P0706 Cause the Wrong Gear to Appear on the Dashboard?

Yes.

The instrument cluster may receive the selected-range information from the TCM.

If the range signal is incorrect, the display may show:

• Wrong gear

• No gear

• Flashing gear indication

• Transmission warning

• Inconsistent gear position

Can P0706 Cause Limp Mode?

Yes.

When the TCM cannot reliably determine the transmission range, it may activate a protective strategy.

Depending on the vehicle, this may include:

• Limited gear selection

• Fixed gear

• Increased hydraulic pressure

• Modified shift strategy

• Disabled automatic functions

Can P0706 Cause Harsh Shifting?

Yes, indirectly.

The TCM uses range information as part of its transmission-control strategy.

If that information is incorrect, the controller may use an inappropriate strategy.

This can contribute to:

• Harsh engagement

• Hard shifts

• Delayed shifting

• Abnormal transmission behavior

How Is P0706 Diagnosed?

The objective is to determine why the sensor signal does not correspond correctly to the expected transmission range.

1. Scan all control modules

Check:

• TCM

• Engine ECU

• Body control module

• Instrument cluster

Look for additional codes related to:

• Range sensors

• Shift solenoids

• Transmission communication

• Gear ratios

• Speed sensors

2. Check freeze-frame data

Review:

• Selected range

• Vehicle speed

• Engine RPM

• Transmission temperature

• Battery voltage

This can help determine when the fault occurred.

3. Check live range data

Use a scan tool and slowly move the selector through:

P → R → N → D

The scan tool should correctly identify each position.

4. Check for invalid or overlapping positions

Some systems use voltage windows for each selector position.

The signal should remain inside the expected window.

A signal falling between two ranges may be interpreted as an invalid position.

5. Compare commanded and actual position

If the scan tool provides both values, compare them.

A disagreement can indicate a mechanical or electrical range problem.

6. Inspect the range sensor

Check:

• Sensor mounting

• Alignment

• Physical damage

• Selector-shaft play

7. Inspect the connector

Check terminals, corrosion, moisture, and connector locking.

8. Inspect the wiring

Check for:

• Open circuit

• High resistance

• Short to ground

• Short to voltage

9. Check sensor adjustment

Follow the manufacturer's adjustment procedure.

10. Check the shift cable and linkage

Verify that the selector reaches each transmission position correctly.

11. Measure sensor signals

Depending on the design, test:

• Signal voltage

• Reference voltage

• Ground

• Resistance

• Continuity

12. Check internal wiring

If the range sensor is integrated into the transmission, internal wiring may need to be inspected.

13. Test the TCM

Only after the sensor and circuits have been verified should the TCM be considered a likely cause.

Why Is Live Data Important?

P0706 is a range/performance code.

This means the sensor may still produce a signal, but the TCM does not consider that signal correct.

Live data can make this obvious.

For example:

Driver selects:

P → R → N → D

Scan tool reports:

P → R → D → D

The transmission controller is not correctly identifying Neutral.

This points toward a range-sensor, adjustment, wiring, or selector problem.

Can a Multimeter Diagnose P0706?

Yes.

A multimeter can be used to test:

• Sensor signal voltage

• Reference voltage

• Ground

• Resistance

• Continuity

However, the correct values must come from the vehicle manufacturer's specifications.

A universal voltage value should not be assumed for every transmission.

Can an Oscilloscope Help?

Yes.

An oscilloscope can be useful when the range signal is unstable or changes unexpectedly.

It can reveal:

• Voltage fluctuations

• Signal dropouts

• Electrical noise

• Incorrect transitions

This is especially useful for faults that occur only briefly.

What If P0706 Appears Only in One Gear?

This can provide a very useful clue.

If the fault occurs only in Reverse, for example, the problem may involve the sensor circuit or internal contact associated with that range.

If it occurs only in Drive, investigate the corresponding signal and mechanical position.

What If P0706 Appears When the Selector Is Between Gears?

This may indicate:

• Sensor misalignment

• Shift cable adjustment

• Selector mechanism wear

• Excessive mechanical play

The transmission selector should reach each detent correctly.

What If P0706 Appears on Bumpy Roads?

This can point toward:

• Loose connector

• Damaged wiring

• Poor terminal contact

• Harness movement

A wiggle test while monitoring range data can help reproduce the problem.

What If P0706 Appears After Transmission Service?

Inspect everything that may have been disturbed.

Pay particular attention to:

• Range sensor

• Sensor mounting

• Electrical connector

• Transmission harness

• Shift linkage

• Shift cable

A sensor that was installed slightly out of alignment can cause P0706.

Can P0706 Cause a No-Start Condition?

Yes.

If the system cannot confirm Park or Neutral, the starter may be disabled.

This is particularly important when P0706 is accompanied by an intermittent starting problem.

Can P0706 Affect Reverse Lights?

Yes, on some vehicles.

If the transmission range signal is used to control the reverse-light circuit, an incorrect Reverse position can prevent the lights from operating correctly.

Can P0706 Affect Cruise Control?

Potentially.

Transmission range information can be shared with other vehicle systems.

If the selected range is considered invalid, some functions may be disabled.

Is P0706 a Serious Problem?

It can be.

Although the underlying cause may be a simple adjustment or electrical problem, an incorrect transmission range signal can affect:

• Starting

• Gear selection

• Shifting

• Reverse operation

• Limp mode

• Vehicle safety

It should therefore be diagnosed rather than ignored.

Can You Drive With P0706?

If the vehicle operates normally and the correct transmission position is consistently displayed, a short trip to a repair facility may be possible.

However, driving should be avoided if:

• The wrong gear is displayed

• Drive or Reverse does not engage correctly

• The vehicle changes gear unexpectedly

• The vehicle enters limp mode

• The gear indicator flashes

• Starting becomes unreliable

• The transmission behaves unpredictably

How Is P0706 Repaired?

The correct repair depends on the actual cause.

Possible repairs include:

• Replacing the Transmission Range Sensor

• Adjusting the range sensor

• Correcting sensor alignment

• Repairing damaged wiring

• Repairing connector terminals

• Replacing a damaged connector

• Repairing internal transmission wiring

• Adjusting the shift cable

• Replacing a damaged shift cable

• Repairing the selector mechanism

• Restoring reference or ground circuits

• Repairing the TCM circuit when properly diagnosed

Does P0706 Require Transmission Repair?

Not necessarily.

P0706 is not proof of internal transmission failure.

A range sensor, shift cable, selector mechanism, connector, or wiring fault can produce the code while the transmission's internal gears and clutches remain mechanically healthy.

If the sensor is located inside the transmission, additional labor may be required to access it, but that does not automatically mean the transmission needs rebuilding.

Common Diagnostic Mistakes

Replacing the range sensor immediately

The actual problem may be sensor alignment or wiring.

Ignoring the shift cable

Mechanical misadjustment can cause the selected position and actual transmission position to disagree.

Ignoring live data

Live range information is one of the most useful diagnostic tools for P0706.

Assuming range/performance means a mechanical transmission failure

The code primarily concerns the relationship between the selector position and electrical range signal.

Testing only while stationary

Some problems appear only under vibration or during driving.

Ignoring connector condition

A loose or corroded connector can alter the sensor signal.

Replacing the TCM too quickly

The sensor, wiring, adjustment, and selector mechanism should be verified first.

P0706 vs. P0705, P0707, P0708 and P0709

These codes are closely related but describe different types of range-sensor problems.

P0705 – Transmission Range Sensor "A" Circuit

General circuit malfunction.

P0706 – Transmission Range Sensor "A" Circuit Range / Performance

The signal is present but does not correspond correctly to the expected range or performance characteristics.

P0707 – Transmission Range Sensor "A" Circuit Low Input

The electrical signal is lower than expected.

P0708 – Transmission Range Sensor "A" Circuit High Input

The electrical signal is higher than expected.

P0709 – Transmission Range Sensor "A" Circuit Intermittent

The signal intermittently becomes unreliable or disappears.

Therefore, P0706 is particularly important when the signal exists but the TCM considers the signal outside the expected operating range or inconsistent with the selected transmission position.

How Do You Clear P0706?

The underlying problem should be repaired before clearing the DTC.

Then:

Clear the DTC → Monitor range-sensor live data → Move through P-R-N-D → Verify gear indication → Start the vehicle several times → Road test → Rescan

The TCM should consistently recognize every transmission position.

If P0706 returns, the range/performance problem has not been resolved.

Final Thoughts on P0706

P0706 – Transmission Range Sensor "A" Circuit Range / Performance indicates that the TCM has detected a problem with the expected range or performance of the Transmission Range Sensor "A" signal.

Unlike P0707 and P0708, which specifically indicate low or high electrical input, P0706 generally means the signal does not correspond correctly to the expected transmission position or operating range.

The main areas to investigate are the Transmission Range Sensor, sensor alignment, shift cable, selector mechanism, wiring, connector, reference voltage, ground circuit, internal transmission wiring, and TCM.

A practical diagnostic path is:

Scan all modules → Check freeze-frame data → Monitor live range data → Move through P-R-N-D → Compare commanded and actual range → Check for invalid positions → Inspect the sensor → Verify sensor alignment → Inspect connector → Test wiring → Check reference and ground circuits → Inspect shift cable and linkage → Check internal wiring if applicable → Test the TCM only after the circuit is verified → Repair the confirmed fault → Clear the code → Road test and rescan.

Most importantly, P0706 does not automatically mean the transmission is mechanically damaged. A misadjusted range sensor, worn selector mechanism, shift cable problem, damaged connector, or wiring fault can cause this code even when the transmission itself is mechanically healthy.