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P1838 2017 Chevrolet Silverado Code - Internal Mode Switch 'A' Circuit High Voltage

Quick Answer

The P1838 diagnostic trouble code for a 2017 Chevrolet Silverado relates to the Internal Mode Switch 'A' Circuit High Voltage. Common causes include Faulty internal mode switch, Damaged wiring or connectors in the internal mode switch circuit, Malfunctioning 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 2017 Chevrolet Silverado indicates Internal Mode Switch 'A' Circuit High Voltage.
Common causes
Common causes include Faulty internal mode switch, Damaged wiring or connectors in the internal mode switch circuit, Malfunctioning 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 10, 2024
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Code P1838 2017 Chevrolet Silverado Description

The P1838 diagnostic trouble code for a 2017 Chevrolet Silverado relates to the Internal Mode Switch 'A' Circuit High Voltage. This code indicates that there is a high voltage condition detected in the internal mode switch circuit. The internal mode switch is responsible for sending signals to the transmission control module (TCM) to inform it of the gear selection made by the driver. When the TCM detects a high voltage issue in this circuit, it can lead to incorrect gear selection, harsh shifting, or even the transmission going into a failsafe mode to prevent further damage.

OBDII Code P1838 2017 Chevrolet Silverado - Internal Mode Switch 'A' Circuit High Voltage
P1838 2017 Chevrolet Silverado Code - Internal Mode Switch 'A' Circuit High Voltage

Common Causes of P1838 2017 Chevrolet Silverado

  1. Faulty internal mode switch
  2. Damaged wiring or connectors in the internal mode switch circuit
  3. Malfunctioning TCM
  4. Corrosion in the internal mode switch circuit
  5. Electrical issues in the transmission system

Symptoms of P1838 2017 Chevrolet Silverado

  1. Harsh shifting between gears
  2. Incorrect gear selection displayed on the instrument cluster
  3. Transmission slipping or delayed engagement
  4. Transmission going into failsafe mode
  5. Check Engine Light illuminated on the dashboard

How to Fix P1838 2017 Chevrolet Silverado

  1. Perform a comprehensive diagnostic scan to retrieve the trouble codes and pinpoint the cause of the high voltage condition in the internal mode switch circuit.
  2. Inspect the internal mode switch, wiring, and connectors for any signs of damage or corrosion. Replace any faulty components as needed.
  3. Test the TCM to ensure it is functioning correctly and communicating with the internal mode switch.
  4. Clear the trouble codes and test drive the vehicle to ensure the issue has been resolved. Monitor the transmission for any abnormal behavior.
  5. If the problem persists, consult with a professional mechanic or dealership for further diagnosis and repair.

Cost to Fix P1838 2017 Chevrolet Silverado

The typical repair costs for addressing the P1838 code on a 2017 Chevrolet Silverado can range from $200 to $500, depending on the extent of the repairs needed. This estimate includes the cost of parts and labor. It is important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Auto repair shops commonly charge between $80 and $150 per hour for labor, but rates may be higher in metropolitan areas or at dealerships, while independent shops may charge less. It is recommended to obtain quotes from local shops to get a more accurate estimate for 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 2017 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P1838 on a 2017 Chevrolet Silverado?

The common symptoms of OBDII code P1838 include issues with shifting gears, difficulty starting the vehicle, and the Check Engine Light illuminating on the dashboard.

2. What does the Internal Mode Switch 'A' Circuit High Voltage mean for a 2017 Chevrolet Silverado?

The Internal Mode Switch 'A' Circuit High Voltage (P1838) indicates a potential problem with the internal mode switch, which is responsible for communicating gear position to the vehicle's computer.

3. What are the possible causes of OBDII code P1838 on a 2017 Chevrolet Silverado?

Possible causes of code P1838 include a faulty internal mode switch, damaged wiring or connectors related to the switch, or issues with the transmission control module.

4. How can I diagnose OBDII code P1838 on my 2017 Chevrolet Silverado?

Diagnosing code P1838 usually involves using a scan tool to retrieve the specific fault code, checking the internal mode switch and related wiring for damage, and testing the transmission control module for proper functioning.

5. Can I still drive my 2017 Chevrolet Silverado with OBDII code P1838?

It is not recommended to drive your vehicle with OBDII code P1838 present, as it can lead to transmission-related issues and potentially cause further damage. It's best to address the problem promptly.

6. How can I repair OBDII code P1838 on my 2017 Chevrolet Silverado?

Repairing code P1838 may involve replacing the internal mode switch, repairing or replacing damaged wiring or connectors, and ensuring the transmission control module is functioning correctly.

7. Is it possible to reset OBDII code P1838 on a 2017 Chevrolet Silverado?

While you can clear the fault code using a scan tool, it's important to address the underlying issue causing code P1838 to prevent it from reoccurring.

8. Will OBDII code P1838 on a 2017 Chevrolet Silverado cause any long-term damage if left unrepaired?

Leaving OBDII code P1838 unrepaired can potentially lead to transmission problems and other issues over time. It's best to address the problem promptly to prevent further damage.

9. Are there any preventive measures to avoid OBDII code P1838 on a 2017 Chevrolet Silverado?

Regularly servicing your vehicle, checking for any signs of transmission issues, and addressing any warning lights immediately can help prevent OBDII code P1838 from occurring.

10. How much does it typically cost to repair OBDII code P1838 on a 2017 Chevrolet Silverado?

The cost of repairing OBDII code P1838 can vary depending on the underlying issue, parts needed for replacement, and labor costs. It's recommended to consult a professional mechanic for an accurate estimate.

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