P0708 Chevrolet 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 Chevrolet 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 Chevrolet 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 Chevrolet?
- 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 Chevrolet?
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
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What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0708 Chevrolet 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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Information for Specific Chevrolet Models
- P0708 2014 Chevrolet Silverado — Transmission Range Switch Circuit High Voltage
- P0708 2015 Chevrolet Silverado — Transmission Range Switch Circuit High Voltage
- P0708 2016 Chevrolet Silverado — Transmission Range Switch Circuit High Voltage
- P0708 2017 Chevrolet Silverado — Transmission Range Switch Circuit High Voltage
- P0708 2018 Chevrolet Silverado — Transmission Range Switch Circuit High Voltage
Frequently Asked Questions about P0708 Chevrolet Code
1. What does the OBDII code P0708 mean on a Chevrolet?
P0708 indicates a high voltage issue in the transmission range switch circuit, which monitors the position of the gear selector.
2. What are the common symptoms of code P0708 in a Chevrolet?
Symptoms include the transmission being stuck in a single gear, hard shifting, the check engine light turning on, and poor fuel efficiency.
3. What causes the P0708 code to appear on a Chevrolet?
Common causes include a faulty transmission range sensor, damaged wiring or connectors in the circuit, or a malfunctioning powertrain control module (PCM).
4. Can I drive my Chevrolet with a P0708 code?
Driving with this code is not recommended as it can lead to erratic shifting, potential transmission damage, and unsafe driving conditions.
5. How do I fix the P0708 code on my Chevrolet?
Repairs may include replacing the transmission range sensor, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the PCM if necessary.
6. How much does it cost to repair code P0708 on a Chevrolet?
Repair costs can range from $150 to $400, depending on whether the issue is a sensor replacement or wiring repair. PCM replacement or reprogramming may cost more.
7. Can a bad battery cause a P0708 code in a Chevrolet?
While uncommon, a weak or failing battery can contribute to electrical issues that may trigger this code, so it’s worth checking.
8. How is the P0708 code diagnosed on a Chevrolet?
A technician will use a scan tool to confirm the code, inspect the transmission range sensor, test wiring and connectors for continuity, and check the PCM for faults.
9. Can a dirty or corroded connector cause the P0708 code?
Yes, dirty or corroded connectors can disrupt the transmission range switch circuit and cause the code to appear.
10. What happens if I ignore the P0708 code on my Chevrolet?
Ignoring this code can result in further damage to the transmission, reduced performance, and potential safety hazards while driving.
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