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Engine-Codes – GMC – P1838 2014 GMC Sierra

P1838 2014 GMC Sierra Code - Internal Mode Switch 'A' Circuit High Voltage

Quick Answer

The P1838 diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates an issue with the Internal Mode Switch 'A' Circuit High Voltage. Common causes include Faulty Internal Mode Switch (IMS), Damaged wiring or connectors in the circuit, Issues with the Transmission Control Module (TCM). 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
P1838 2014 GMC Sierra indicates Internal Mode Switch 'A' Circuit High Voltage.
Common causes
Common causes include Faulty Internal Mode Switch (IMS), Damaged wiring or connectors in the circuit, Issues with the Transmission Control Module (TCM).
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 P1838 2014 GMC Sierra Description

The P1838 diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates an issue with the Internal Mode Switch 'A' Circuit High Voltage. The Internal Mode Switch (IMS) is a component of the transmission control system that helps the vehicle's computer determine the current gear selection. In this case, the high voltage in the circuit indicates a potential problem with the IMS, which can lead to incorrect gear selection, transmission shifting issues, and overall poor vehicle performance.

OBDII Code P1838 2014 GMC Sierra - Internal Mode Switch 'A' Circuit High Voltage
P1838 2014 GMC Sierra Code - Internal Mode Switch 'A' Circuit High Voltage

Common Causes of P1838 2014 GMC Sierra

  1. Faulty Internal Mode Switch (IMS)
  2. Damaged wiring or connectors in the circuit
  3. Issues with the Transmission Control Module (TCM)
  4. Short circuit in the circuit
  5. Broken wire in the IMS system

Symptoms of P1838 2014 GMC Sierra

  1. Erratic shifting behavior
  2. Transmission slipping
  3. Delayed engagement when shifting gears
  4. Transmission stuck in a single gear
  5. Harsh shifting

How to Fix P1838 2014 GMC Sierra

  1. Perform a thorough inspection of the IMS system, wiring, and connectors to identify any visible damage.
  2. Test the IMS for proper functionality and voltage readings using a multimeter.
  3. Replace the Internal Mode Switch if it is found to be faulty.
  4. Repair or replace any damaged wiring or connectors in the circuit.
  5. Clear the DTC and perform a test drive to ensure the transmission is shifting correctly.

Cost to Fix P1838 2014 GMC Sierra

The typical repair costs for addressing the Internal Mode Switch 'A' Circuit High Voltage issue in a 2014 GMC Sierra can range from $200 to $500, depending on the extent of the damage and the specific parts that need to be replaced. This estimate includes the cost of parts and labor. However, it's important to note that actual repair costs can vary based on factors such as location, vehicle make and model, and the rates charged by auto repair shops. It's recommended to obtain quotes from local shops to get a more accurate estimate for this repair. Labor rates at auto repair shops typically range from $80 to $150 per hour, with rates potentially higher at dealerships or in metropolitan areas.

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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 P1838 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P1838 in a 2014 GMC Sierra?

Common symptoms include issues with shifting gears, hesitation during acceleration, and illuminated warning lights on the dashboard.

2. What does the OBDII code P1838 'Internal Mode Switch 'A' Circuit High Voltage' mean for a 2014 GMC Sierra?

This code indicates that there is a high voltage condition detected in the internal mode switch 'A' circuit of the vehicle.

3. What are the possible causes of OBDII code P1838 in a 2014 GMC Sierra?

Potential causes 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 OBDII code P1838 in my 2014 GMC Sierra?

Diagnosis typically involves using a scan tool to read the code, checking the internal mode switch for proper operation, and inspecting the circuit for any visible damage.

5. Can I continue driving my 2014 GMC Sierra with OBDII code P1838?

It is not recommended to drive the vehicle with this code present, as it can lead to further transmission problems and potential safety issues.

6. How can I repair OBDII code P1838 in my 2014 GMC Sierra?

Repair options may include replacing the internal mode switch, repairing any damaged wiring or connectors, or reprogramming the transmission control module.

7. Is it possible to reset the OBDII code P1838 in a 2014 GMC Sierra without fixing the underlying issue?

While you can clear the code with a scan tool, it will likely reappear if the root cause of the problem is not addressed.

8. How much does it cost to repair OBDII code P1838 in a 2014 GMC Sierra?

The cost of repair can vary depending on the specific cause of the code and the labor rates of the repair facility. It is recommended to get a professional diagnosis for an accurate estimate.

9. Will OBDII code P1838 cause my 2014 GMC Sierra to fail an emissions test?

Yes, having this code stored in the vehicle's computer can result in a failed emissions test, as it indicates an issue with the transmission system.

10. How long does it take to fix OBDII code P1838 in a 2014 GMC Sierra?

The repair time can vary depending on the exact cause of the code and the availability of parts. It is best to consult with a mechanic for a more accurate timeframe.

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