AutoCodes – Chevrolet – P18BD 2015 Chevrolet Silverado

P18BD 2015 Chevrolet Silverado Code - Internal Mode Switch 'P' 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: P18BD 2015 Chevrolet Silverado indicates Internal Mode Switch 'P' 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 300

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 P18BD 2015 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 P signal circuit has an invalid voltage range of 1.68 – 2.38 V for 2.7 s.

OBDII Code P18BD 2015 Chevrolet Silverado - Internal Mode Switch 'P' Circuit Stuck Off Invalid Voltage Range - AutoCodes.com — P18BD 2015 Chevrolet Silverado Code - Internal Mode Switch 'P' Circuit Stuck Off Invalid Voltage Range

What does this mean?

What are the Possible Causes of the DTC P18BD 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 P18BD 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 P18BD 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.

Need more information about the P18BD 2015 Chevrolet Silverado code?

Need more information on how to fix the P18BD 2015 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 P18BD 2015 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P18BD in a 2015 Chevrolet Silverado?

The common symptoms of OBDII code P18BD in a 2015 Chevrolet Silverado may include issues with shifting gears, difficulty starting the vehicle, or the transmission not engaging properly.

2. What can cause the Internal Mode Switch 'P' Circuit Stuck Off Invalid Voltage Range error in a 2015 Chevrolet Silverado?

The Internal Mode Switch 'P' Circuit Stuck Off Invalid Voltage Range error in a 2015 Chevrolet Silverado can be caused by a faulty internal mode switch, damaged wiring harness, or issues with the transmission control module.

3. How serious is the P18BD code in a 2015 Chevrolet Silverado?

The P18BD code in a 2015 Chevrolet Silverado can affect the vehicle's drivability and transmission performance. It is advisable to address this issue promptly to avoid potential transmission problems.

4. Can I continue driving my 2015 Chevrolet Silverado with the P18BD code present?

It is not recommended to continue driving your 2015 Chevrolet Silverado with the P18BD code present, as it can lead to further damage to the transmission system. It is best to have the issue diagnosed and repaired as soon as possible.

5. How can I diagnose the Internal Mode Switch 'P' Circuit Stuck Off Invalid Voltage Range error in my 2015 Chevrolet Silverado?

Diagnosing the Internal Mode Switch 'P' Circuit Stuck Off Invalid Voltage Range error in your 2015 Chevrolet Silverado typically involves using a diagnostic scanner to retrieve the trouble codes, conducting a visual inspection of the wiring, and testing the internal mode switch for proper operation.

6. What are some repair tips for fixing the P18BD code in a 2015 Chevrolet Silverado?

Repair tips for fixing the P18BD code in a 2015 Chevrolet Silverado may include checking and repairing any damaged wiring, replacing the internal mode switch if necessary, and resetting the trouble codes after the repair is completed.

7. Can a DIY enthusiast fix the Internal Mode Switch 'P' Circuit Stuck Off Invalid Voltage Range error in a 2015 Chevrolet Silverado?

While some DIY enthusiasts may be able to diagnose and repair the Internal Mode Switch 'P' Circuit Stuck Off Invalid Voltage Range error in a 2015 Chevrolet Silverado, it is recommended to seek professional help for this type of transmission-related issue.

8. How much does it cost to repair the P18BD code in a 2015 Chevrolet Silverado?

The cost to repair the P18BD code in a 2015 Chevrolet Silverado can vary depending on the root cause of the issue, the extent of the damage, and the labor rates of the repair shop. It is advisable to obtain quotes from multiple sources for an accurate estimate.

9. Are there any recalls or technical service bulletins related to the P18BD code in a 2015 Chevrolet Silverado?

It is recommended to check with the manufacturer or a Chevrolet dealership for any recalls or technical service bulletins related to the P18BD code in a 2015 Chevrolet Silverado. This information can help in understanding if there are known issues or fixes provided by the manufacturer.

10. How can I prevent the Internal Mode Switch 'P' Circuit Stuck Off Invalid Voltage Range error from occurring in my 2015 Chevrolet Silverado?

To prevent the Internal Mode Switch 'P' Circuit Stuck Off Invalid Voltage Range error in your 2015 Chevrolet Silverado, regular maintenance checks, including inspecting the transmission system and related components, can help identify potential issues early and prevent them from escalating into more significant problems.