AutoCodes – Chevrolet – P18BF 2016 Chevrolet Silverado

P18BF 2016 Chevrolet Silverado Code - Internal Mode Switch 'A' 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: P18BF 2016 Chevrolet Silverado indicates Internal Mode Switch 'A' 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.

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Code Popularity 239

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 23, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P18BF 2016 Chevrolet Silverado Description

The internal mode switch indicates the Transmission Control Module (TCM) which gear position the vehicle operator has selected. The internal mode switch consists of 5 separate hall effect switches. Each hall effect switch is supplied with a 9 V reference circuit and a signal circuit from the TCM. Each signal circuit for each gear selector position will have either a voltage reading of 0.70–0.96 V indicating On or 1.68–2.38 V indicating Off. The voltage values on each internal mode switch circuit will change and are dependent on the position of the gear selector. The state of each internal mode switch A/B/C/P/S signal circuit is displayed on the scan tool. The Diagnostic Trouble Code (DTC) will be set when the TCM has detected the internal mode switch A signal circuit has an invalid voltage range of 0.70 – 0.96 V, for 2.7 s.

OBDII Code P18BF 2016 Chevrolet Silverado - Internal Mode Switch 'A' Circuit Stuck On Invalid Voltage Range - AutoCodes.com — P18BF 2016 Chevrolet Silverado Code - Internal Mode Switch 'A' Circuit Stuck On Invalid Voltage Range

What does this mean?

What are the Possible Causes of the DTC P18BF 2016 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 P18BF 2016 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 P18BF 2016 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.

Need more information about the P18BF 2016 Chevrolet Silverado code?

Need more information on how to fix the P18BF 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P18BF 2016 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P18BF on a 2016 Chevrolet Silverado?

The common symptoms of OBDII code P18BF on a 2016 Chevrolet Silverado include issues with gear shifting, the vehicle getting stuck in a particular gear, and potential difficulties starting the engine.

2. What does the Internal Mode Switch 'A' Circuit Stuck On Invalid Voltage Range mean for a 2016 Chevrolet Silverado?

The code P18BF indicates that the Internal Mode Switch 'A' Circuit is experiencing an invalid voltage range, leading to potential problems with the transmission control system.

3. What are the possible causes of the Internal Mode Switch 'A' Circuit Stuck On Invalid Voltage Range in a 2016 Chevrolet Silverado?

Possible causes of code P18BF in a 2016 Chevrolet Silverado include a faulty internal mode switch, damaged wiring or connectors in the circuit, or issues with the transmission control module.

4. How serious is OBDII code P18BF on a 2016 Chevrolet Silverado?

Code P18BF should be addressed promptly as it can lead to transmission-related issues and affect the overall drivability of the vehicle. Ignoring this code may result in further damage to the transmission system.

5. Can I continue driving my 2016 Chevrolet Silverado with OBDII code P18BF?

It is not recommended to continue driving your 2016 Chevrolet Silverado with code P18BF, as it may cause transmission problems and potential safety hazards. It's best to have the issue diagnosed and repaired by a qualified mechanic.

6. How can I diagnose OBDII code P18BF on my 2016 Chevrolet Silverado?

Diagnosing code P18BF involves using a diagnostic scanner to retrieve the code, checking the internal mode switch and related circuitry for faults, and inspecting the transmission control module for any issues.

7. Is it possible to repair OBDII code P18BF in a 2016 Chevrolet Silverado at home?

While some DIY enthusiasts may attempt to address code P18BF at home by checking for loose connections or damaged wiring, it is recommended to seek professional assistance for a thorough diagnosis and repair.

8. How much does it cost to fix OBDII code P18BF on a 2016 Chevrolet Silverado?

The cost of repairing code P18BF on a 2016 Chevrolet Silverado can vary depending on the exact cause of the issue, parts needed for replacement, and labor costs. It is advisable to obtain quotes from different mechanics for an accurate estimate.

9. Can a bad internal mode switch cause OBDII code P18BF in a 2016 Chevrolet Silverado?

Yes, a faulty internal mode switch is a common cause of code P18BF in a 2016 Chevrolet Silverado. The switch may get stuck in an invalid voltage range, triggering the OBDII code and leading to transmission-related problems.

10. How long does it take to repair OBDII code P18BF on a 2016 Chevrolet Silverado?

The repair time for code P18BF on a 2016 Chevrolet Silverado can vary based on the specific issue causing the code. It may take a few hours to a full day for diagnosis, parts replacement, and testing to ensure the problem is resolved effectively.