P0708 2017 GMC Sierra Code - Transmission Range Switch Circuit High Voltage
Quick Answer
The Transmission Internal Mode Switch (IMS) consists of 5 internal switches, A, B, C, P, and Neutral Start. Common causes include Faulty Transmission Internal Mode Switch (IMS), Transmission Internal Mode Switch harness is open or shorted, Transmission Internal Mode Switch circuit poor electrical connection. 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 2017 GMC Sierra indicates Transmission Range Switch Circuit High Voltage.
- Common causes
- Common causes include Faulty Transmission Internal Mode Switch (IMS), Transmission Internal Mode Switch harness is open or shorted, Transmission Internal Mode Switch circuit poor electrical connection.
- 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.
Code P0708 2017 GMC Sierra Description
The Engine Control Module (ECM) supplies a signal circuit to the neutral start switch. The ECM uses the state of the neutral start switch state as confirmation that the transmission is in neutral or park before the engine starter is engaged.
The Diagnostic Trouble Code (DTC) will be set when the TCM detects the internal mode switch is reporting an illegal range for greater than 1 s.
What are the Possible Causes of the DTC P0708 2017 GMC Sierra?
- Faulty Transmission Internal Mode Switch (IMS)
- Transmission Internal Mode Switch harness is open or shorted
- Transmission Internal Mode Switch circuit poor electrical connection
- Faulty Transmission Control Module (TCM)
How to Fix the DTC P0708 2017 GMC Sierra?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0708 2017 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P0708 2017 GMC Sierra code?
Need more information on how to fix the P0708 2017 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0708 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0708 2017 GMC Sierra Code
1. What are the common symptoms of OBDII code P0708 in a 2017 GMC Sierra?
- Common symptoms include issues shifting gears, incorrect gear indication on the dashboard, and the vehicle not starting.
2. What does the OBDII code P0708 mean for a 2017 GMC Sierra?
- OBDII code P0708 indicates a problem with the Transmission Range Switch Circuit High Voltage in the vehicle's transmission system.
3. What are the possible causes of OBDII code P0708 in a 2017 GMC Sierra?
- Possible causes include a faulty transmission range switch, damaged wiring or connectors, low transmission fluid levels, or a malfunctioning PCM.
4. How can I diagnose the OBDII code P0708 in my 2017 GMC Sierra?
- Diagnosis involves using a scan tool to retrieve the trouble code, inspecting the transmission range switch and its circuit, checking for damaged wiring, and testing the switch's voltage.
5. How serious is OBDII code P0708 in a 2017 GMC Sierra?
- OBDII code P0708 can lead to transmission-related issues and should be addressed promptly to prevent further damage to the transmission system.
6. Can I drive my 2017 GMC Sierra with OBDII code P0708?
- It is not recommended to drive the vehicle with OBDII code P0708 as it can result in transmission problems and potential safety hazards.
7. How do I repair OBDII code P0708 in my 2017 GMC Sierra?
- Repair typically involves replacing the faulty transmission range switch, repairing any damaged wiring or connectors, ensuring proper transmission fluid levels, and clearing the trouble code.
8. Are there any DIY tips for fixing OBDII code P0708 in a 2017 GMC Sierra?
- DIY tips include checking and cleaning the connectors, inspecting the wiring for any visible damage, and ensuring the transmission fluid is at the correct level.
9. Can resetting the OBDII code P0708 in my 2017 GMC Sierra fix the issue temporarily?
- Resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to reappear.
10. How much does it cost to repair OBDII code P0708 in a 2017 GMC Sierra at a mechanic?
- The cost of repair can vary depending on the exact cause of the code, but it typically ranges from $200 to $500, including parts and labor.
Discuss the causes and fixes for P0708 2017 GMC Sierra OBDII Code
Code P0708 2017 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
