P0706 Transmission Range Sensor “A” Circuit Range/Performance
OBD2 Error Codes

P0706 Transmission Range Sensor “A” Circuit Range/Performance

10.10.2023 /

P0706 – OBD-II Trouble Code Technical Description

Typical: Transmission Range Sensor “A” Circuit Range/Performance

General Motors: Transmission Range Sensor Specifications

Jaguar: Dual Line Switch Signals Missing

What does the fault code mean P0706?

Diagnostic Trouble Code (DTC) P0706 applies to OBD-II compliant transmissions. This code is part of a group of transmission-related trouble codes and is designated a “C” type code. “C” codes are not emissions related and do not activate the check engine light or store freeze frames of data.

Example of an external transmit range sensor (TRS):

P0706 is related to the transmission range sensor, also known as the Park/Neutral (PN) switch or neutral safety switch. Its job is to tell the powertrain control module (PCM) the current position of the gear shift, allowing the engine to start only in Park and Neutral modes. The sensor sends back to the PCM a voltage corresponding to the selected gear. If this voltage is not as expected, then code P0706 is set.

On vehicles with an automatic transmission, this sensor informs the ECM/TCM of the transmission position (neutral or park). If the voltage readings are not what the ECM expects, a P0706 code will be set and the indicator will illuminate.

Possible reasons

This code (P0706) may occur for the following reasons:

  1. Faulty transmission range sensor.
  2. Incorrect transmission range sensor setting.
  3. Open or shorted transmission range sensor wires.
  4. Faulty PCM (engine control module).
  5. Faulty or incorrectly adjusted neutral safety switch/park/neutral position switch.
  6. Damaged, corroded or shorted wiring.
  7. Damaged gear shift rod.
  8. Problems with the ECU (electronic control unit).

What are the symptoms of a fault code? P0706?

Because the neutral safety switch is part of the transmission range sensor, the vehicle may start in any gear and/or the PCM will put the transmission into a limp mode with a lack of power, especially when coming to a complete stop. This poses a serious safety hazard as the vehicle may start to move in gear when starting. The problem should be corrected immediately.

Symptoms of a P0706 trouble code include:

  1. The ignition indicator checks the engine.
  2. Unstable gear shifting.
  3. Inability to start the engine.
  4. The ability to start the engine in gear, which can lead to sudden acceleration.
  5. Limp Mode, which can limit transmission shifting.

How to diagnose a fault code P0706?

To diagnose P0706:

  1. Start by checking the transmission range sensor, connectors and wiring. Make sure there is no damage, corrosion or short circuit.
  2. Apply the parking brake and move the gear lever to the Drive or Reverse position. See if the engine starts. If so, disconnect the sensor and try starting the engine in gear again. If the engine starts, the transmission range sensor may be faulty.
  3. There are two possible conditions under which this code is set:
  • Condition #1: The PCM detects motion or reverse when starting the vehicle.
  • Condition #2: The PCM detects Park or Neutral and the following conditions are met for 10 seconds or more:
    • Throttle position is 5% or more.
    • Engine torque exceeds 50 ft-lbs.
    • Vehicle speed exceeds 20 mph.
  1. This code is most often found on 4WD trucks that are in "XNUMX wheel drive" mode and have damaged range sensors and/or seat belts. Rarely, a faulty PCM may be the cause.
  2. Diagnosing this code is quite simple:
  • Establish parking harassment.
  • Inspect the range sensor and wiring carefully and repair any damage.
  • Try starting the car in different positions of the gear lever, excluding a short circuit in the wiring.
  • If the problem persists, the transmission range sensor may be faulty or incorrectly adjusted.
  1. Associated transmission range sensor codes are P0705, P0707, P0708, and P0709.

Diagnostic errors

Mechanic errors when diagnosing P0706 may include:

  1. Misdiagnosing the Transmission Range Sensor: A mechanic may mistakenly replace the sensor without thoroughly diagnosing and checking the wiring. This can lead to unnecessary costs and incorrect solution to the problem.
  2. Unaccounted for wiring damage: Wiring, connections, and connectors may be damaged, corroded, or shorted. The mechanic should conduct a complete inspection of the wiring, starting with a visual inspection and ending with resistance measurements.
  3. Sensor Adjustment Not Checked: If the transmission range sensor is not adjusted correctly, it may result in a misdiagnosis. The mechanic must ensure that the sensor is in the correct position.
  4. Unreported Other Transmission Problems: P0706 can be caused not only by a faulty range sensor, but also by other transmission problems. A mechanic should perform a complete diagnosis of the transmission to rule out other causes.
  5. Misinterpretation of scanner data: A mechanic may misinterpret scanner data and draw incorrect conclusions. It is important to have experience with scanners and an understanding of the data they provide.
  6. Parking Brake Test Failed: P0706 may be related to the parking brake position. The mechanic must ensure that the parking brake is set correctly and is functioning correctly.

To successfully diagnose P0706, it is important for a mechanic to pay attention to detail, conduct a systematic check and rule out all possible causes before making replacements or repairs.

How serious is the fault code? P0706?

Trouble code P0706 associated with the transmission range sensor or neutral position switch can be serious depending on the circumstances and the extent to which it affects vehicle performance. Here are some aspects to consider:

  1. Safety Impact: If the transmission range sensor is not functioning properly, it can result in dangerous situations such as the engine being unable to start while in gear. This poses a serious risk to the safety of the driver and others.
  2. Impact Level: If the transmission range sensor produces incorrect signals or does not function at all, it can affect the performance of the transmission, which can lead to loss of power and other driving problems.
  3. Driveability: Having a P0706 code may limit your vehicle's ability to start, which can be inconvenient and result in downtime.
  4. Loss of Emission Monitoring: Code P0706 is not an emissions system code, so its presence will not cause the Check Engine Light to turn on. This means that drivers may not notice other emissions-related problems if they exist.

Considering the above factors, the P0706 code should be considered serious, especially in the context of vehicle safety and performance. Prompt repair of this problem is recommended to ensure the safety and normal operation of your vehicle.

What repair will help eliminate the code? P0706?

The following repairs and diagnostic activities may be required to resolve the P0706 code:

Transmission Range Sensor Diagnosis:

  • Check the sensor for damage.
  • Sensor resistance measurement.
  • Make sure the sensor is installed and adjusted correctly.

Checking wiring and connectors:

  • Visually inspect the wires for damage, corrosion or breaks.
  • Measuring the resistance of wires and connectors.
  • Elimination of damage and corrosion.

Checking the parking brake:

  • Make sure the parking brake is properly set and functioning.
  • Test the parking brake.

Diagnosing other transmission problems:

  • Check other sensors and transmission components for faults.
  • Perform a transmission scan to identify other fault codes.

Replacing the transmission range sensor (if necessary):

  • If the sensor is found to be faulty, replace it with a new or reconditioned one.
  1. Firmware or reprogramming of the ECU (if necessary):
  • In some cases, after replacing the sensor, it may be necessary to flash or reprogram the ECU to clear the P0706 code.

Re-diagnosis and clearing the fault code:

  • After completing the repair work, re-diagnosis to ensure that the problem has been resolved.
  • Clear trouble code P0706 using a scanner or special equipment.

It is important to note that in order to successfully resolve the P0706 code, you must conduct a thorough diagnosis, correct any problems found, and conduct a test to ensure that the problem does not return. If you do not have experience with automotive repairs, it is recommended that you contact a qualified mechanic or auto repair shop.

What is P0706 Engine Code [Quick Guide]

P0706 – Brand-specific information

Trouble code P0706 is typically associated with the Transmission Range Sensor or Neutral Safety Switch. This code can be common to many car brands, and its decoding remains similar regardless of the brand. However, below is a list of several car brands and their interpretations of the P0706 code:

Ford:

Chevrolet:

Toyota:

Sling:

Nissan:

BMW:

Mercedes Benz:

Volkswagen (VW):

Hyundai:

These breakdowns can help determine what part of the transmission system may be affected, but it is recommended that you take it to a professional auto mechanic or service center for accurate diagnosis and repair, as specifications may vary among different vehicle models and years.

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