P18C0 2015 Chevrolet Silverado Code - Internal Mode Switch 'B' Circuit Stuck On Invalid Voltage Range
Quick Answer
The internal mode switch indicates the Transmission Control Module (TCM) which gear position the vehicle operator has selected. Common causes include Faulty Transmission Internal Mode Switch, 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
- P18C0 2015 Chevrolet Silverado indicates Internal Mode Switch 'B' Circuit Stuck On Invalid Voltage Range.
- Common causes
- Common causes include Faulty Transmission Internal Mode Switch, 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 P18C0 2015 Chevrolet Silverado Description
What are the Possible Causes of the DTC P18C0 2015 Chevrolet Silverado?
- Faulty Transmission Internal Mode Switch
- 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 P18C0 2015 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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P18C0 2015 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 P18C0 2015 Chevrolet Silverado Code
1. What does the OBDII code P18C0 mean on a 2015 Chevrolet Silverado?
P18C0 indicates an "Internal Mode Switch 'B' Circuit Stuck On Invalid Voltage Range," meaning there is an issue with the transmission's internal mode switch detecting an invalid voltage.
2. What are the common symptoms of the P18C0 code?
Symptoms may include the transmission not shifting properly, the Check Engine Light being illuminated, and the vehicle potentially being stuck in one gear.
3. What causes the P18C0 code to appear on a 2015 Chevrolet Silverado?
This code is typically caused by a faulty internal mode switch, wiring or connector issues in the transmission control circuit, or a damaged transmission control module (TCM).
4. Can I drive my Silverado with the P18C0 code active?
It’s not recommended to drive for extended periods with this code, as improper transmission operation can lead to further damage or unsafe driving conditions.
5. How do you diagnose the P18C0 code?
A mechanic will check the transmission wiring and connectors, test the internal mode switch for proper function, and use a scan tool to monitor voltage signals from the switch.
6. What repairs are typically needed to fix the P18C0 code?
Repairs may include replacing the internal mode switch, repairing or replacing damaged wiring or connectors, and, in rare cases, replacing the transmission control module.
7. How much does it cost to fix the P18C0 code?
The repair cost varies but can range from $200 to $600 depending on whether the switch, wiring, or control module needs replacement.
8. Can a software issue cause the P18C0 code?
While less common, outdated or corrupted TCM software could potentially cause this code and may require an update or reprogramming.
9. What tools are needed to diagnose and repair the P18C0 code?
Tools required include an OBDII scan tool, a multimeter for voltage testing, and possibly a transmission pressure gauge depending on the diagnostic steps.
10. Is the P18C0 code covered under warranty for a 2015 Chevrolet Silverado?
It depends on the vehicle’s mileage and warranty status. The powertrain warranty might cover it if the vehicle is still within the coverage period.
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