AutoCodes – Chevrolet – P18BB 2014 Chevrolet Silverado

P18BB 2014 Chevrolet Silverado Code - Internal Mode Switch 'B' Circuit Stuck Off 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: P18BB 2014 Chevrolet Silverado indicates Internal Mode Switch 'B' Circuit Stuck Off 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 838

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 P18BB 2014 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 B signal circuit has an invalid voltage range of 1.68 – 2.38 V for 2.7 s.

OBDII Code P18BB 2014 Chevrolet Silverado - Internal Mode Switch 'B' Circuit Stuck Off Invalid Voltage Range - AutoCodes.com — P18BB 2014 Chevrolet Silverado Code - Internal Mode Switch 'B' Circuit Stuck Off Invalid Voltage Range

What does this mean?

What are the Possible Causes of the DTC P18BB 2014 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 P18BB 2014 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 P18BB 2014 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 P18BB 2014 Chevrolet Silverado code?

Need more information on how to fix the P18BB 2014 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 P18BB 2014 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P18BB in a 2014 Chevrolet Silverado?

The common symptoms of OBDII code P18BB in a 2014 Chevrolet Silverado include issues with shifting gears, erratic transmission behavior, and the inability to shift into certain gears.

2. What can cause the Internal Mode Switch 'B' Circuit to be stuck off in a 2014 Chevrolet Silverado?

The Internal Mode Switch 'B' Circuit in a 2014 Chevrolet Silverado can be stuck off due to wiring problems, a faulty internal mode switch, or issues with the transmission control module.

3. How can I diagnose the Internal Mode Switch 'B' Circuit issue in my 2014 Chevrolet Silverado?

Diagnosing the Internal Mode Switch 'B' Circuit issue in a 2014 Chevrolet Silverado involves using a scan tool to retrieve the OBDII code, checking the wiring and connections, and testing the internal mode switch for proper functionality.

4. Can I continue driving my 2014 Chevrolet Silverado with OBDII code P18BB?

It is not recommended to continue driving your 2014 Chevrolet Silverado with OBDII code P18BB, as it can lead to further transmission problems and potential safety hazards. It is best to address the issue promptly.

5. How can I repair the Internal Mode Switch 'B' Circuit stuck off issue in my 2014 Chevrolet Silverado?

Repairing the Internal Mode Switch 'B' Circuit stuck off issue in a 2014 Chevrolet Silverado may involve repairing or replacing damaged wiring, replacing the internal mode switch, or reprogramming the transmission control module.

6. Is it possible to reset the OBDII code P18BB in a 2014 Chevrolet Silverado?

Resetting the OBDII code P18BB in a 2014 Chevrolet Silverado may temporarily clear the code, but it is essential to address the underlying issue causing the code to prevent it from reoccurring.

7. How much does it cost to fix OBDII code P18BB in a 2014 Chevrolet Silverado?

The cost to fix OBDII code P18BB in a 2014 Chevrolet Silverado can vary depending on the cause of the issue, the required repairs, and labor costs. It is recommended to consult a professional mechanic for an accurate estimate.

8. Can a DIY enthusiast repair the Internal Mode Switch 'B' Circuit issue in a 2014 Chevrolet Silverado?

While some DIY enthusiasts may have the skills to diagnose and repair the Internal Mode Switch 'B' Circuit issue in a 2014 Chevrolet Silverado, it is recommended to seek professional help due to the complexity of transmission-related repairs.

9. Will OBDII code P18BB cause my 2014 Chevrolet Silverado to fail an emissions test?

OBDII code P18BB in a 2014 Chevrolet Silverado can potentially cause the vehicle to fail an emissions test, as it indicates a malfunction in the transmission system that can affect emissions control. It is advisable to address the issue before undergoing an emissions test.

10. How long does it typically take to fix the Internal Mode Switch 'B' Circuit issue in a 2014 Chevrolet Silverado?

The time required to fix the Internal Mode Switch 'B' Circuit issue in a 2014 Chevrolet Silverado can vary depending on the extent of the problem, availability of parts, and the expertise of the mechanic. It is advisable to consult with the repair shop for a more accurate timeframe.