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P1839 2014 Chevrolet Silverado Code - Internal Mode Switch 'C' Circuit Low Voltage

Quick Answer

The P1839 diagnostic trouble code (DTC) for a 2014 Chevrolet Silverado refers to an issue with the Internal Mode Switch 'C' Circuit Low Voltage. Common causes include Wiring harness issues, Faulty Internal Mode Switch (IMS), Malfunctioning Engine Control Module (ECM). 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 Wiring harness issues, Faulty Internal Mode Switch (IMS), Malfunctioning Engine Control Module (ECM).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code P1839 2014 Chevrolet Silverado Description

The P1839 diagnostic trouble code (DTC) for a 2014 Chevrolet Silverado refers to an issue with the Internal Mode Switch 'C' Circuit Low Voltage. The Internal Mode Switch (IMS) is a component within the transmission that communicates with the vehicle's engine control module (ECM) to determine the current gear selection. In this case, the 'C' circuit is indicating a low voltage condition, which can lead to various performance issues.

OBDII Code P1839 2014 Chevrolet Silverado - Internal Mode Switch 'C' Circuit Low Voltage
P1839 2014 Chevrolet Silverado Code - Internal Mode Switch 'C' Circuit Low Voltage

Common Causes of P1839 2014 Chevrolet Silverado

  1. Wiring harness issues
  2. Faulty Internal Mode Switch (IMS)
  3. Malfunctioning Engine Control Module (ECM)
  4. Poor electrical connection

Symptoms of P1839 2014 Chevrolet Silverado

  1. Harsh shifting between gears
  2. Delayed engagement when shifting gears
  3. Transmission slippage
  4. Check engine light illuminated on the dashboard

How to Fix P1839 2014 Chevrolet Silverado

  1. Begin by conducting a thorough inspection of the wiring harness connected to the Internal Mode Switch 'C' circuit to check for any visible damage or loose connections.
  2. Test the Internal Mode Switch (IMS) using a multimeter to determine if it is functioning correctly. Replace the IMS if necessary.
  3. Check the Engine Control Module (ECM) for any faults or errors related to the 'C' circuit. Reset or replace the ECM as needed.
  4. Ensure all electrical connections related to the IMS 'C' circuit are secure and free of corrosion. Clean or repair any faulty connections.
  5. Clear the DTC from the vehicle's ECM using a diagnostic scan tool and test drive the vehicle to confirm that the issue has been resolved.

Cost to Fix P1839 2014 Chevrolet Silverado

The typical repair costs for addressing the Internal Mode Switch 'C' Circuit Low Voltage issue can range from $200 to $500, depending on the specific cause of the problem and the cost of parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, with hourly rates typically ranging between $80 and $150. Factors such as location, vehicle make and model, and engine type can also impact repair costs. For a more accurate estimate, it is recommended to consult with a local auto repair shop.

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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 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.

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