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P1839 2017 Chevrolet Silverado Code - Internal Mode Switch 'C' Circuit Low Voltage

Quick Answer

The P1839 diagnostic trouble code (DTC) for a 2017 Chevrolet Silverado refers to the Internal Mode Switch 'C' Circuit Low Voltage. Common causes include Faulty internal mode switch, Damaged wiring or connectors in the internal mode switch circuit, Corrosion or poor connection in the internal mode switch 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 2017 Chevrolet Silverado indicates Internal Mode Switch 'C' Circuit Low Voltage.
Common causes
Common causes include Faulty internal mode switch, Damaged wiring or connectors in the internal mode switch circuit, Corrosion or poor connection in the internal mode switch 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 18, 2024
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Code P1839 2017 Chevrolet Silverado Description

The P1839 diagnostic trouble code (DTC) for a 2017 Chevrolet Silverado refers to the Internal Mode Switch 'C' Circuit Low Voltage. This code is typically associated with a malfunction in the internal mode switch, which is responsible for communicating the gear selector position to the vehicle's transmission control module (TCM). The internal mode switch is a critical component that helps the TCM determine the appropriate gear selection based on the driver's input.

OBDII Code P1839 2017 Chevrolet Silverado - Internal Mode Switch 'C' Circuit Low Voltage
P1839 2017 Chevrolet Silverado Code - Internal Mode Switch 'C' Circuit Low Voltage

Common Causes of P1839 2017 Chevrolet Silverado

  1. Faulty internal mode switch
  2. Damaged wiring or connectors in the internal mode switch circuit
  3. Corrosion or poor connection in the internal mode switch circuit
  4. Issues with the transmission control module (TCM)
  5. Electrical system malfunctions affecting the internal mode switch circuit

Symptoms of P1839 2017 Chevrolet Silverado

  1. Harsh shifting between gears
  2. Delayed engagement when shifting
  3. Inaccurate gear selection display on the instrument cluster
  4. Transmission slipping or failure to shift gears

How to Fix P1839 2017 Chevrolet Silverado

  1. Begin by conducting a thorough inspection of the internal mode switch and its circuitry to identify any visible damage or corrosion.
  2. Test the internal mode switch using a multimeter to check for proper voltage and continuity.
  3. Inspect the wiring harness and connectors associated with the internal mode switch for any signs of damage or poor connection.
  4. If necessary, replace the internal mode switch and repair or replace any damaged wiring or connectors.
  5. Clear the DTC from the vehicle's memory using a diagnostic scan tool and test drive the vehicle to ensure proper operation of the transmission.

Cost to Fix P1839 2017 Chevrolet Silverado

The typical repair costs for addressing the P1839 code on a 2017 Chevrolet Silverado can vary depending on the extent of the issue and the specific components that require replacement. On average, the cost of replacing the internal mode switch and addressing any associated wiring issues can range from $200 to $500, including parts and labor. It is important to note that diagnostic time and labor rates at auto repair shops can vary, so it is advisable to check with local providers for a more accurate estimate. Additionally, rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing.

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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 2017 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P1839 in a 2017 Chevrolet Silverado?

The common symptoms include issues with shifting gears, transmission slipping, and the vehicle may go into limp mode.

2. What can cause the Internal Mode Switch 'C' Circuit Low Voltage code in a 2017 Chevrolet Silverado?

Possible causes include a faulty internal mode switch, damaged wiring or connectors, low voltage in the circuit, or a problem with the transmission control module.

3. How serious is the P1839 code in a 2017 Chevrolet Silverado?

The P1839 code can cause significant transmission issues and potentially lead to further damage if not addressed promptly. It is important to diagnose and repair the issue as soon as possible.

4. Can I continue driving my 2017 Chevrolet Silverado with the Internal Mode Switch 'C' Circuit Low Voltage code?

It is not recommended to continue driving the vehicle with this code present, as it can lead to transmission problems and potentially unsafe driving conditions.

5. How can I diagnose the Internal Mode Switch 'C' Circuit Low Voltage issue in my 2017 Chevrolet Silverado?

Diagnosis typically involves using a scan tool to read the OBDII codes, checking the internal mode switch and related wiring for damage, and testing the voltage in the circuit.

6. Can I repair the P1839 code in my 2017 Chevrolet Silverado myself?

Depending on your level of automotive expertise, you may be able to repair the issue yourself by replacing the internal mode switch, repairing damaged wiring, or addressing any other identified causes. However, professional help is recommended for more complex repairs.

7. Is it expensive to fix the Internal Mode Switch 'C' Circuit Low Voltage code in a 2017 Chevrolet Silverado?

The cost of repairs for this code can vary depending on the root cause of the issue and whether professional help is needed. It's best to get a diagnostic assessment to determine the exact cost.

8. How long does it take to repair the P1839 code in a 2017 Chevrolet Silverado?

The repair time can vary based on the specific cause of the issue and the complexity of the repair. Simple fixes like replacing a sensor may take less time compared to more extensive repairs involving the transmission control module.

9. Will resetting the OBDII code P1839 in my 2017 Chevrolet Silverado make it go away permanently?

Resetting the code may temporarily clear the warning light, but if the underlying issue causing the code is not fixed, it is likely to reappear. It's crucial to address the root cause of the problem for a permanent solution.

10. Can the OBDII code P1839 in a 2017 Chevrolet Silverado affect fuel efficiency?

Yes, if left unresolved, the P1839 code can impact fuel efficiency due to the transmission not functioning optimally. Addressing the issue promptly can help prevent further fuel consumption issues.

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