P18B6 2015 GMC Sierra Code - Internal Mode Switch 'B' Circuit Shorted
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
- P18B6 2015 GMC Sierra indicates Internal Mode Switch 'B' Circuit Shorted.
- 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 P18B6 2015 GMC Sierra Description
What are the Possible Causes of the DTC P18B6 2015 GMC Sierra?
- 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 P18B6 2015 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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P18B6 2015 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 P18B6 2015 GMC Sierra code?
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Frequently Asked Questions about P18B6 2015 GMC Sierra Code
1. What are the common symptoms of OBDII code P18B6 in a 2015 GMC Sierra?
The common symptoms of code P18B6 include issues with shifting gears, the transmission not engaging properly, and the check engine light illuminating on the dashboard.
2. What does the OBDII code P18B6 'Internal Mode Switch B Circuit Shorted' mean for a 2015 GMC Sierra?
The code P18B6 indicates a problem with the internal mode switch 'B' circuit, specifically a short circuit. This affects the proper communication between the transmission control module and the internal mode switch.
3. What are the possible causes of OBDII code P18B6 in a 2015 GMC Sierra?
Common causes of code P18B6 include a faulty internal mode switch, damaged wiring or connectors in the circuit, a short circuit in the internal mode switch 'B' circuit, or issues with the transmission control module.
4. How can I diagnose OBDII code P18B6 in a 2015 GMC Sierra?
Diagnosing code P18B6 involves using a scan tool to retrieve the code, inspecting the internal mode switch 'B' circuit for any visible damage, checking the wiring and connectors, and conducting a thorough inspection of the transmission control module.
5. Is it safe to continue driving a 2015 GMC Sierra with OBDII code P18B6 present?
It is not recommended to continue driving the vehicle with code P18B6 present, as it can lead to transmission issues and potential safety hazards. It's best to address the problem promptly to avoid further damage.
6. Can I repair OBDII code P18B6 in a 2015 GMC Sierra myself?
While some DIY enthusiasts may attempt to repair code P18B6 themselves by replacing the internal mode switch, it's recommended to consult a professional mechanic for an accurate diagnosis and proper repair to ensure the issue is resolved correctly.
7. How much does it typically cost to fix OBDII code P18B6 in a 2015 GMC Sierra?
The cost of repairing code P18B6 can vary depending on the root cause of the issue, the extent of the damage, and labor costs. It's advisable to get multiple quotes from reputable auto repair shops to compare prices.
8. Will resetting the OBDII code P18B6 in a 2015 GMC Sierra make it go away permanently?
Simply resetting the code may temporarily turn off the check engine light, but it will not fix the underlying issue causing code P18B6. It's crucial to diagnose and repair the problem to prevent it from reoccurring.
9. Can a low battery voltage trigger OBDII code P18B6 in a 2015 GMC Sierra?
Low battery voltage can potentially cause electrical issues that may lead to code P18B6 being triggered. Ensuring the battery is in good condition and properly charged is essential in maintaining the vehicle's electrical system.
10. How long does it typically take to repair OBDII code P18B6 in a 2015 GMC Sierra?
The repair time for code P18B6 can vary depending on the exact cause of the issue, the availability of parts, and the mechanic's expertise. In some cases, it can be resolved within a few hours, while more complex repairs may take longer.
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