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P1838 2014 Chevrolet Silverado Code - Internal Mode Switch 'A' Circuit High Voltage

Quick Answer

The P1838 diagnostic trouble code (DTC) for a 2014 Chevrolet Silverado refers to an issue with the Internal Mode Switch 'A' Circuit High Voltage. Common causes include Faulty internal mode switch, Damaged wiring harness, Corrosion or poor connections 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
P1838 2014 Chevrolet Silverado indicates Internal Mode Switch 'A' Circuit High Voltage.
Common causes
Common causes include Faulty internal mode switch, Damaged wiring harness, Corrosion or poor connections 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 17, 2024
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Code P1838 2014 Chevrolet Silverado Description

The P1838 diagnostic trouble code (DTC) for a 2014 Chevrolet Silverado refers to an issue with the Internal Mode Switch 'A' Circuit High Voltage. This code indicates that there is a problem with the internal mode switch, which is responsible for communicating the gear shift position to the vehicle's transmission control module (TCM). The internal mode switch is an essential component that helps the TCM determine the current gear selection and adjust transmission functions accordingly.

OBDII Code P1838 2014 Chevrolet Silverado - Internal Mode Switch 'A' Circuit High Voltage
P1838 2014 Chevrolet Silverado Code - Internal Mode Switch 'A' Circuit High Voltage

Common Causes of P1838 2014 Chevrolet Silverado

  1. Faulty internal mode switch
  2. Damaged wiring harness
  3. Corrosion or poor connections in the circuit
  4. Issues with the TCM
  5. Electrical system malfunctions

Symptoms of P1838 2014 Chevrolet Silverado

  1. Erratic shifting behavior
  2. Incorrect gear selection displayed on the dashboard
  3. Transmission slipping or hesitation
  4. Check Engine Light illuminated on the dashboard

How to Fix P1838 2014 Chevrolet Silverado

  1. Begin by conducting a thorough inspection of the internal mode switch, wiring harness, and TCM to identify any visible damage or issues.
  2. Test the internal mode switch using a multimeter to check for proper voltage readings and continuity.
  3. Inspect the wiring harness for any signs of damage, corrosion, or loose connections. Repair or replace any faulty wiring as needed.
  4. If the internal mode switch is determined to be faulty, replace it with a new one following the manufacturer's guidelines.
  5. Clear the DTC from the vehicle's memory using a diagnostic scan tool and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1838 2014 Chevrolet Silverado

The typical repair costs for addressing the Internal Mode Switch 'A' Circuit High Voltage code can range from $200 to $500, depending on the specific components that need to be replaced and the labor involved. This estimate includes the cost of parts such as the internal mode switch, wiring harness, and any necessary diagnostic tools. It is important to note that the actual repair costs may vary based on the location of the auto repair shop, the make and model of the vehicle, and the extent of the damage. Additionally, labor rates at auto repair shops can vary between $80 and $150 per hour, so it is advisable to inquire about specific rates before proceeding with the repair.

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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 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P1838 in a 2014 Chevrolet Silverado?

- Common symptoms include difficulty shifting gears, erratic shifting behavior, and the transmission not responding properly.

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

- This code indicates that there is a high voltage condition detected in the Internal Mode Switch 'A' circuit.

3. What are the possible causes of OBDII code P1838 in a 2014 Chevrolet Silverado?

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

4. How can I diagnose the OBDII code P1838 in my 2014 Chevrolet Silverado?

- Diagnosis involves using a scan tool to check for the code, inspecting the internal mode switch and related wiring, and testing the transmission control module.

5. Can I still drive my 2014 Chevrolet Silverado with OBDII code P1838?

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

6. How can I repair OBDII code P1838 in my 2014 Chevrolet Silverado?

- Repairing this code may involve 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 Chevrolet Silverado without fixing the underlying issue?

- While you can clear the code with a scan tool, it is crucial to address the root cause of the problem to prevent it from reoccurring.

8. Are there any DIY tips for resolving OBDII code P1838 in a 2014 Chevrolet Silverado?

- DIY tips may include checking and cleaning the connectors, ensuring proper grounding, and inspecting the internal mode switch for any signs of damage.

9. What should I do if the OBDII code P1838 keeps coming back in my 2014 Chevrolet Silverado after repairs?

- If the code persists after repairs, it may indicate a deeper issue that requires further diagnosis by a professional mechanic or dealership.

10. How much can I expect to pay for repairing OBDII code P1838 in a 2014 Chevrolet Silverado?

- The cost of repairs can vary depending on the exact cause of the code, but it is advisable to budget for diagnostic fees, parts, and labor costs.

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