AutoCodes – Chevrolet – P1839 2016 Chevrolet Silverado

P1839 2016 Chevrolet Silverado Code - Internal Mode Switch 'C' Circuit Low Voltage

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: P1839 2016 Chevrolet Silverado indicates Internal Mode Switch 'C' Circuit Low Voltage.
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 377

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 P1839 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 C signal circuit voltage is less than 0.7 V, for 1.75 s.

OBDII Code P1839 2016 Chevrolet Silverado - Internal Mode Switch 'C' Circuit Low Voltage - AutoCodes.com — P1839 2016 Chevrolet Silverado Code - Internal Mode Switch 'C' Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1839 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 P1839 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 P1839 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 P1839 2016 Chevrolet Silverado code?

Need more information on how to fix the P1839 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 P1839 2016 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P1839 in a 2016 Chevrolet Silverado?

The common symptoms of code P1839 in a 2016 Chevrolet Silverado include issues with shifting gears, erratic shifting patterns, and illuminated warning lights on the dashboard.

2. What does the Internal Mode Switch 'C' Circuit Low Voltage mean in relation to OBDII code P1839 in a 2016 Chevrolet Silverado?

The Internal Mode Switch 'C' Circuit Low Voltage indicates a problem with the circuit responsible for detecting the gear position in the transmission control module of a 2016 Chevrolet Silverado.

3. What are the possible causes of OBDII code P1839 in a 2016 Chevrolet Silverado?

Possible causes of code P1839 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 can I diagnose the Internal Mode Switch 'C' Circuit Low Voltage issue in my 2016 Chevrolet Silverado?

Diagnosing the Internal Mode Switch 'C' Circuit Low Voltage problem involves using a scan tool to retrieve the code, inspecting the wiring and connectors for damage, and testing the internal mode switch for proper functionality.

5. Can I continue driving my 2016 Chevrolet Silverado with OBDII code P1839 present?

It is not recommended to drive your 2016 Chevrolet Silverado with OBDII code P1839 present as it can lead to transmission-related issues and potentially cause further damage if left unaddressed.

6. How can I repair OBDII code P1839 in my 2016 Chevrolet Silverado?

To repair code P1839 in a 2016 Chevrolet Silverado, you may need to replace the internal mode switch, repair any damaged wiring or connectors, or reprogram the transmission control module if necessary.

7. Is it possible to reset OBDII code P1839 in a 2016 Chevrolet Silverado without fixing the underlying issue?

Resetting OBDII code P1839 without addressing the underlying problem will only temporarily remove the warning light but will not fix the issue causing the fault code to reappear.

8. Can a DIY enthusiast fix OBDII code P1839 in a 2016 Chevrolet Silverado?

While some aspects of diagnosing and repairing code P1839 can be done by a DIY enthusiast, it is recommended to seek professional help, especially when dealing with internal transmission components.

9. How much does it cost to repair OBDII code P1839 in a 2016 Chevrolet Silverado?

The cost of repairing code P1839 in a 2016 Chevrolet Silverado can vary depending on the root cause of the issue, parts needed for replacement, and labor costs at the repair shop.

10. How can I prevent OBDII code P1839 from occurring in my 2016 Chevrolet Silverado in the future?

Regular maintenance of your 2016 Chevrolet Silverado, including checking the transmission system for any signs of wear or damage, can help prevent issues like code P1839 from occurring in the future.