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Engine-Codes – Generic – P1839

P1839 Code - Internal Mode Switch 'C' Circuit Low Voltage

Quick Answer

The diagnostic trouble code P1839 refers to an issue with the Internal Mode Switch 'C' Circuit having low voltage. Common causes include Faulty internal mode switch, Wiring or connection issues in the circuit, Corrosion or damage to the internal mode switch. 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 indicates Internal Mode Switch 'C' Circuit Low Voltage.
Common causes
Common causes include Faulty internal mode switch, Wiring or connection issues in the circuit, Corrosion or damage to the internal mode switch.
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 06, 2024
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Code P1839 Description

The diagnostic trouble code P1839 refers to an issue with the Internal Mode Switch 'C' Circuit having low voltage. In simpler terms, this means that there is a problem with the circuit that controls the internal mode switch, which is responsible for determining the gear position in the vehicle. This can have a significant impact on the vehicle's performance and overall driving experience. The internal mode switch is a crucial component that communicates with the vehicle's transmission control module to ensure that the correct gear is engaged at all times. When this circuit is not functioning properly, it can lead to a variety of issues such as incorrect gear selection, hesitation or jerking while shifting, and even potential transmission failure.

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

Common Causes of P1839

  1. Faulty internal mode switch
  2. Wiring or connection issues in the circuit
  3. Corrosion or damage to the internal mode switch
  4. Issues with the transmission control module
  5. Electrical system malfunctions

Symptoms of P1839

  1. Incorrect gear selection displayed on the dashboard
  2. Delayed or rough shifting between gears
  3. Loss of power or acceleration
  4. Transmission slipping or erratic behavior
  5. Check Engine Light illuminated on the dashboard

How to Fix P1839

  1. Diagnose the issue using a diagnostic scanner to confirm the P1839 code and pinpoint the exact cause of the problem.
  2. Inspect the internal mode switch and its wiring for any visible damage, corrosion, or loose connections.
  3. Test the internal mode switch and circuit using a multimeter to determine if it is functioning within the specified voltage range.
  4. Replace the internal mode switch if it is found to be faulty or damaged, ensuring that the new part is calibrated correctly.
  5. Clear the trouble code from the vehicle's computer system and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix P1839

The cost of repairing a P1839 code can vary depending on the specific cause of the issue and the make and model of the vehicle. On average, the cost of replacing an internal mode switch can range from $150 to $300, including parts and labor. However, additional costs may be incurred if there are other underlying issues that need to be addressed. It is recommended to consult with a professional mechanic or auto repair shop to get an accurate estimate for the repair. Keep in mind that labor rates can vary widely, so it's essential to consider this when budgeting for the repair.

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Code P1839 Information for Specific Makes

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.

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