P0708 2014 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 2014 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 2014 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 2014 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 2014 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 2014 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.
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Frequently Asked Questions about P0708 2014 GMC Sierra Code
1. What does the OBDII code P0708 mean on a 2014 GMC Sierra?
P0708 indicates a "Transmission Range Switch Circuit High Voltage" issue, meaning the transmission range sensor is reporting a voltage outside the expected range.
2. What are the common symptoms of code P0708 in a 2014 GMC Sierra?
Symptoms may include the transmission not shifting properly, the vehicle being stuck in one gear, the check engine light turning on, or erratic gear indicator lights.
3. What causes the P0708 code in a 2014 GMC Sierra?
Common causes include a faulty transmission range sensor, damaged wiring or connectors, a short circuit, or a malfunctioning PCM (Powertrain Control Module).
4. Can I drive my 2014 GMC Sierra with a P0708 code?
Driving with a P0708 code is not recommended, as it can cause transmission damage or unsafe driving conditions due to erratic shifting.
5. How do I diagnose the P0708 code on a 2014 GMC Sierra?
Start by checking the transmission range sensor and its wiring for damage. Then, use a multimeter to test the sensor’s signal and inspect the PCM for any faults.
6. How much does it cost to fix a P0708 code on a 2014 GMC Sierra?
Repair costs vary but typically range from $200 to $450, depending on whether the issue is a sensor replacement, wiring repair, or PCM programming.
7. Can a bad battery cause the P0708 code in a 2014 GMC Sierra?
While uncommon, a weak or failing battery can contribute to electrical issues, potentially causing incorrect sensor voltage readings.
8. How do I reset the P0708 code on my 2014 GMC Sierra?
After fixing the issue, you can reset the code using an OBDII scanner. If the problem persists, the code will reappear.
9. What role does the transmission range sensor play in a 2014 GMC Sierra?
The transmission range sensor detects the gear selector position and sends the information to the PCM for proper transmission control.
10. Can a P0708 code damage the transmission on a 2014 GMC Sierra?
If unresolved, a P0708 code can lead to improper shifting, which may cause long-term transmission damage. Prompt diagnosis and repair are essential.
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