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

Quick Answer

The P1839 diagnostic trouble code (DTC) for a 2016 Chevrolet Silverado indicates an issue with the Internal Mode Switch 'C' Circuit Low Voltage. Common causes include Faulty Internal Mode Switch, Damaged wiring or connectors, Corrosion in the circuit. 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 Internal Mode Switch, Damaged wiring or connectors, Corrosion in the circuit.
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 12, 2024
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Code P1839 2016 Chevrolet Silverado Description

The P1839 diagnostic trouble code (DTC) for a 2016 Chevrolet Silverado indicates an issue with the Internal Mode Switch 'C' Circuit Low Voltage. The Internal Mode Switch (IMS) is a component within the transmission that communicates the gear selection to the vehicle's control module. In this case, the 'C' circuit is signaling a low voltage condition, which can disrupt the transmission's ability to shift properly. This can lead to erratic shifting patterns, harsh shifts, or even a failure to shift gears at all.

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

Common Causes of P1839 2016 Chevrolet Silverado

  1. Faulty Internal Mode Switch
  2. Damaged wiring or connectors
  3. Corrosion in the circuit
  4. Issues with the vehicle's control module
  5. Electrical system malfunctions

Symptoms of P1839 2016 Chevrolet Silverado

  1. Erratic shifting patterns
  2. Harsh shifts
  3. Failure to shift gears
  4. Check Engine Light illuminated
  5. Reduced fuel efficiency

How to Fix P1839 2016 Chevrolet Silverado

  1. Perform a diagnostic scan to retrieve the trouble code and pinpoint the exact cause of the low voltage condition in the 'C' circuit.
  2. Inspect the Internal Mode Switch and wiring for any signs of damage or corrosion. Replace any faulty components.
  3. Test the circuit for proper voltage and continuity. Repair or replace any damaged wiring or connectors.
  4. Clear the trouble code from the vehicle's memory and test drive the vehicle to ensure proper shifting operation.
  5. If the issue persists, further diagnostics may be necessary to identify any underlying issues with the control module or other related components.

Cost to Fix P1839 2016 Chevrolet Silverado

The typical repair costs for addressing a P1839 code in a 2016 Chevrolet Silverado can vary depending on the extent of the issue and the specific components that need to be replaced. On average, the repair costs for this issue could range from $200 to $500, including parts and labor. However, it is important to note that labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. It is advisable to check with local auto repair shops for a more accurate estimate based on your specific circumstances.

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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.

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