AutoCodes – Chevrolet – P1839 2014 Chevrolet Silverado

P1839 2014 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 2014 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 280

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

OBDII Code P1839 2014 Chevrolet Silverado - Internal Mode Switch 'C' Circuit Low Voltage - AutoCodes.com — P1839 2014 Chevrolet Silverado Code - Internal Mode Switch 'C' Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1839 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 P1839 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 P1839 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 P1839 2014 Chevrolet Silverado code?

Need more information on how to fix the P1839 2014 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1839 2014 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 2014 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P1839 in a 2014 Chevrolet Silverado?

The common symptoms of OBDII code P1839 (Internal Mode Switch 'C' Circuit Low Voltage) in a 2014 Chevrolet Silverado may include issues with gear shifting, hesitation or jerking during acceleration, and the inability to shift gears properly.

2. What causes the Internal Mode Switch 'C' Circuit Low Voltage code (P1839) in a 2014 Chevrolet Silverado?

The P1839 code in a 2014 Chevrolet Silverado is typically caused by a malfunction in the internal mode switch, low voltage in the circuit, or wiring/connectivity issues related to the switch.

3. How serious is the OBDII code P1839 in a 2014 Chevrolet Silverado?

While the P1839 code may not cause immediate drivability issues, it is important to address it promptly to prevent potential transmission problems and ensure optimal vehicle performance.

4. Can I continue driving my 2014 Chevrolet Silverado with the P1839 code present?

It is not recommended to continue driving your Chevrolet Silverado with the P1839 code present, as it can lead to further damage to the transmission system if left unresolved.

5. How can I diagnose the Internal Mode Switch 'C' Circuit Low Voltage code in my 2014 Chevrolet Silverado?

Diagnosing the P1839 code typically involves using a scan tool to retrieve the specific fault code, inspecting the internal mode switch and related wiring, and testing the circuit for proper voltage.

6. Are there any DIY repair tips for fixing the P1839 code in a 2014 Chevrolet Silverado?

While some basic troubleshooting like checking for loose connections or damaged wiring may be done DIY, it is recommended to consult a professional mechanic for a thorough diagnosis and proper repair of the P1839 code.

7. How much does it cost to repair the Internal Mode Switch 'C' Circuit Low Voltage code in a 2014 Chevrolet Silverado?

The cost of repairing the P1839 code in a 2014 Chevrolet Silverado can vary depending on the exact cause of the issue, parts needed for replacement, and labor costs at the repair shop.

8. Can resetting the OBDII system clear the P1839 code in my 2014 Chevrolet Silverado?

Resetting the OBDII system may temporarily clear the P1839 code, but if the underlying issue causing the code is not addressed, it is likely to reappear after some driving cycles.

9. Is the Internal Mode Switch 'C' Circuit Low Voltage code covered under warranty for a 2014 Chevrolet Silverado?

The coverage of the P1839 code under warranty depends on the specific warranty terms and conditions of your Chevrolet Silverado, so it is advisable to check with the dealership or manufacturer.

10. How can I prevent the recurrence of the P1839 code in my 2014 Chevrolet Silverado?

Regular maintenance checks, prompt attention to any warning signs, and addressing transmission-related issues promptly can help prevent the recurrence of the P1839 code in your Chevrolet Silverado.