AutoCodes – Chevrolet – P18BE 2017 Chevrolet Silverado

P18BE 2017 Chevrolet Silverado Code - Internal Mode Switch 'S' 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: P18BE 2017 Chevrolet Silverado indicates Internal Mode Switch 'S' 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 220

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 P18BE 2017 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 S signal circuit has an invalid voltage range of 1.68 – 2.38 V, for 2.7 s.

OBDII Code P18BE 2017 Chevrolet Silverado - Internal Mode Switch 'S' Circuit Stuck Off Invalid Voltage Range - AutoCodes.com — P18BE 2017 Chevrolet Silverado Code - Internal Mode Switch 'S' Circuit Stuck Off Invalid Voltage Range

What does this mean?

What are the Possible Causes of the DTC P18BE 2017 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 P18BE 2017 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 P18BE 2017 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 P18BE 2017 Chevrolet Silverado code?

Need more information on how to fix the P18BE 2017 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 P18BE 2017 Chevrolet Silverado Code

What does the OBDII code P18BE mean on a 2017 Chevrolet Silverado?

The P18BE code indicates an issue with the Internal Mode Switch 'S' Circuit, which is stuck off and showing an invalid voltage range.

What are the common symptoms of the P18BE code in a 2017 Chevrolet Silverado?

Symptoms may include the transmission not shifting properly, the vehicle being stuck in a specific gear, or the check engine light being illuminated.

What causes the P18BE code to appear on a Chevrolet Silverado?

Common causes include a faulty internal mode switch, damaged wiring or connectors in the transmission control circuit, or a malfunctioning transmission control module (TCM).

Can I drive my 2017 Chevrolet Silverado with the P18BE code?

Driving with the P18BE code is not recommended, as it may lead to transmission issues, reduced drivability, or further damage to related components.

How is the P18BE code diagnosed on a 2017 Chevrolet Silverado?

A mechanic will typically use a scan tool to check the code, inspect the wiring and connectors for damage, and test the internal mode switch and related circuits for proper voltage.

What is the internal mode switch in the 2017 Chevrolet Silverado?

The internal mode switch is a component within the transmission that helps determine the gear position for proper shifting and operation.

How do you fix the P18BE code on a Chevrolet Silverado?

Repairs may involve replacing the internal mode switch, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the TCM if necessary.

What tools are needed to fix the P18BE code on a 2017 Chevrolet Silverado?

You may need a diagnostic scan tool, a multimeter for voltage testing, and basic tools for inspecting and repairing wiring or replacing faulty components.

How much does it cost to fix the P18BE code on a 2017 Chevrolet Silverado?

The repair cost can vary, but replacing the internal mode switch typically costs between $200 and $500, depending on labor rates and parts prices.

Can a software update resolve the P18BE code on a Chevrolet Silverado?

In some cases, a TCM software update or reprogramming may resolve the issue if it's caused by a software-related malfunction rather than a hardware failure.