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P0708 2016 GMC Sierra Code - Transmission Range Switch Circuit High Voltage

Quick Answer

The P0708 code in a 2016 GMC Sierra indicates a problem with the Transmission Range Switch Circuit High Voltage. Common causes include Faulty transmission range switch, Damaged wiring or connectors in the circuit, Corrosion or moisture in the transmission range switch circuit. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0708 2016 GMC Sierra indicates Transmission Range Switch Circuit High Voltage.
Common causes
Common causes include Faulty transmission range switch, Damaged wiring or connectors in the circuit, Corrosion or moisture in the transmission range switch circuit.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P0708 2016 GMC Sierra Description

The P0708 code in a 2016 GMC Sierra indicates a problem with the Transmission Range Switch Circuit High Voltage. The transmission range switch, also known as the neutral safety switch, is responsible for determining the gear position of the transmission. This information is crucial for the proper operation of the transmission system, as it ensures that the vehicle starts only in Park or Neutral. When the voltage in the transmission range switch circuit is detected to be too high, it can lead to various issues with the transmission's performance.

OBDII Code P0708 2016 GMC Sierra - Transmission Range Switch Circuit High Voltage
P0708 2016 GMC Sierra Code - Transmission Range Switch Circuit High Voltage

Common Causes of P0708 2016 GMC Sierra

  1. Faulty transmission range switch.
  2. Damaged wiring or connectors in the circuit.
  3. Corrosion or moisture in the transmission range switch circuit.
  4. Issues with the control module communicating with the switch.
  5. Electrical problems in the transmission system.

Symptoms of P0708 2016 GMC Sierra

  1. Check Engine Light illuminated on the dashboard.
  2. Difficulty starting the vehicle.
  3. Erratic shifting behavior.
  4. Vehicle starts in gear other than Park or Neutral.
  5. Transmission slips or fails to engage properly.

How to Fix P0708 2016 GMC Sierra

  1. Begin by performing a thorough diagnosis to pinpoint the exact cause of the high voltage in the transmission range switch circuit.
  2. Inspect the transmission range switch for any signs of damage or malfunction. Replace the switch if necessary.
  3. Check the wiring and connectors in the circuit for any corrosion, damage, or loose connections. Repair or replace as needed.
  4. Clear the diagnostic trouble codes from the vehicle's computer and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, further diagnostic testing may be required to identify any underlying electrical issues in the transmission system.

Cost to Fix P0708 2016 GMC Sierra

The typical repair costs for addressing a P0708 code in a 2016 GMC Sierra can range from $200 to $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is advisable to check local rates for a more precise estimate. Most auto repair shops commonly charge between $80 and $150 per hour, with rates potentially higher in metropolitan areas or at dealerships, and lower at independent shops.

What does this mean?

Tech Notes for P0708 2016 GMC Sierra

The Internal Mode Switch (IMS) is mounted to the manual shift shaft detent lever as an assembly. The components of the detent lever/IMS assembly cannot be individually serviced. When the IMS needs replacing, the entire assembly must be replaced.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0708 2016 GMC Sierra Code

1. What does the P0708 code mean on a 2016 GMC Sierra?

The P0708 code indicates a high voltage signal in the transmission range switch circuit, which monitors gear selection.

2. What are the symptoms of a P0708 code in a 2016 GMC Sierra?

Common symptoms include difficulty shifting gears, the transmission stuck in one gear, the check engine light illuminated, or the vehicle entering limp mode.

3. What causes the P0708 code on a 2016 GMC Sierra?

Potential causes include a faulty transmission range sensor, damaged wiring or connectors in the circuit, or issues with the vehicle's powertrain control module (PCM).

4. Can I drive my 2016 GMC Sierra with a P0708 code?

It’s not recommended to drive for long distances as the transmission may not shift properly, which can lead to further damage or unsafe driving conditions.

5. How do I diagnose a P0708 code on a GMC Sierra?

Start by inspecting the wiring and connectors for damage or corrosion, check the transmission range sensor for proper operation, and verify voltage and signal readings using a multimeter.

6. How much does it cost to fix a P0708 code on a 2016 GMC Sierra?

The repair cost depends on the issue, ranging from $150–$400 for sensor replacement, while wiring repairs can vary based on complexity.

7. Will clearing the P0708 code fix the problem?

Clearing the code may turn off the check engine light temporarily, but it will return if the underlying issue isn’t resolved.

8. What tools are needed to fix the P0708 code on a 2016 GMC Sierra?

Basic tools include a multimeter, OBDII scanner, and possibly a replacement transmission range sensor if it’s defective.

9. Does the P0708 code always mean the transmission range sensor is faulty?

No, it can also be caused by wiring issues, connector damage, or problems with the PCM.

10. Can a bad battery cause a P0708 code in a 2016 GMC Sierra?

While uncommon, low or unstable battery voltage can sometimes interfere with sensor signals and trigger the code.

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