P0708 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado?
- 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 2018 Chevrolet Silverado?
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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado Code
What does the OBDII code P0708 mean for a 2018 Chevrolet Silverado?
1. The code 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 the P0708 code on a 2018 Chevrolet Silverado?
Symptoms may include the transmission not shifting properly, the gear position not displaying correctly, the vehicle going into limp mode, or the check engine light turning on. 3.
What causes the P0708 code to appear on a 2018 Chevrolet Silverado?
Common causes include a faulty transmission range sensor, damaged wiring or connectors in the circuit, or a problem with the Powertrain Control Module (PCM). 4.
Can I continue driving my 2018 Chevrolet Silverado with the P0708 code?
It is not recommended to drive with this code active, as it can lead to transmission damage or unsafe driving conditions due to gear selection issues. 5.
How do I diagnose the P0708 code on a 2018 Chevrolet Silverado?
Start by inspecting the transmission range sensor, wiring, and connectors for damage or corrosion. Use a multimeter to test circuit voltage and continuity, and scan the PCM for related codes. 6.
How is the P0708 code typically fixed on a 2018 Chevrolet Silverado?
Repairs may include replacing the transmission range sensor, repairing or replacing damaged wiring or connectors, or reprogramming/updating the PCM if necessary. 7.
How much does it cost to repair the P0708 code on a 2018 Chevrolet Silverado?
The repair cost can range from $150 to $400, depending on whether the issue is with the sensor, wiring, or PCM. 8.
Can a dead battery cause the P0708 code on a 2018 Chevrolet Silverado?
A dead or weak battery is unlikely to directly cause this code, but low voltage can sometimes lead to electrical issues that trigger transmission-related codes. 9.
Does the P0708 code require reprogramming the PCM on a 2018 Chevrolet Silverado?
Reprogramming the PCM is only necessary if the issue stems from a software glitch or if recommended by a service bulletin. 10.
Can I reset the P0708 code on my 2018 Chevrolet Silverado without repairs?
Clearing the code without addressing the underlying issue may temporarily turn off the check engine light, but the code will likely return if the problem persists.
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