Engine-Codes.com
Engine-Codes – Chevrolet – P1838 2015 Chevrolet Silverado

P1838 2015 Chevrolet Silverado Code - Internal Mode Switch 'A' Circuit High Voltage

Quick Answer

The P1838 diagnostic trouble code (DTC) for a 2015 Chevrolet Silverado indicates a problem with the Internal Mode Switch 'A' Circuit High Voltage. Common causes include Faulty Internal Mode Switch, Damaged wiring or connectors in the IMS circuit, Malfunctioning Transmission Control Module. 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 2015 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 IMS circuit, Malfunctioning Transmission Control Module.
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 14, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P1838 2015 Chevrolet Silverado Description

The P1838 diagnostic trouble code (DTC) for a 2015 Chevrolet Silverado indicates a problem with the Internal Mode Switch 'A' Circuit High Voltage. The Internal Mode Switch (IMS) is a component of the transmission control system that communicates the gear selection to the vehicle's computer. When the IMS 'A' circuit registers a high voltage, it means that there is an issue with the signal being sent from the IMS to the transmission control module (TCM). This can lead to incorrect gear selection, erratic shifting, and overall poor transmission performance.

OBDII Code P1838 2015 Chevrolet Silverado - Internal Mode Switch 'A' Circuit High Voltage
P1838 2015 Chevrolet Silverado Code - Internal Mode Switch 'A' Circuit High Voltage

Common Causes of P1838 2015 Chevrolet Silverado

  1. Faulty Internal Mode Switch
  2. Damaged wiring or connectors in the IMS circuit
  3. Malfunctioning Transmission Control Module
  4. Corrosion or moisture in the electrical connections
  5. General wear and tear on the transmission components

Symptoms of P1838 2015 Chevrolet Silverado

  1. Erratic shifting or difficulty changing gears
  2. Harsh shifting or slipping gears
  3. Delayed engagement when shifting from park to drive
  4. Illumination of the Check Engine Light
  5. Reduced fuel efficiency

How to Fix P1838 2015 Chevrolet Silverado

  1. Begin by using a diagnostic scanner to confirm the P1838 code and identify the specific issue.
  2. Inspect the wiring and connectors in the IMS circuit for any damage or corrosion. Repair or replace as needed.
  3. Test the Internal Mode Switch for proper operation. Replace if faulty.
  4. Check the Transmission Control Module for any malfunctions. Repair or replace as necessary.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1838 2015 Chevrolet Silverado

The cost of repairing the Internal Mode Switch 'A' Circuit High Voltage issue can vary depending on the extent of the problem and the specific parts that need to be replaced. On average, the repair cost for this type of transmission issue can range from $200 to $600, including parts and labor. However, it's important to note that labor rates at auto repair shops can vary significantly, with hourly rates typically ranging from $80 to $150. Additionally, the cost of parts for a Chevrolet Silverado may also impact the overall repair expenses. It's recommended to obtain a detailed estimate from a trusted mechanic or dealership to get a more accurate cost assessment.

Need more information about the P1838 2015 Chevrolet Silverado code?

Need more information on how to fix the P1838 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1838 2015 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 2015 Chevrolet Silverado Code

1. What does OBDII code P1838 mean on a 2015 Chevrolet Silverado?

The P1838 code indicates a high voltage issue in the Internal Mode Switch 'A' circuit, which is part of the transmission range switch system.

2. What are the common symptoms of code P1838 in a 2015 Silverado?

Symptoms may include transmission shifting issues, the gear indicator not matching the actual gear, the check engine light turning on, and potentially entering limp mode.

3. What causes the P1838 code to appear in a 2015 Chevrolet Silverado?

Common causes include a faulty internal mode switch, damaged wiring or connectors in the circuit, or a malfunctioning transmission control module (TCM).

4. How can I diagnose the P1838 code on my Silverado?

Start by scanning for stored codes, inspecting the wiring and connectors of the internal mode switch, and testing the switch with a multimeter to verify voltage levels.

5. Can a faulty internal mode switch cause transmission issues in a Silverado?

Yes, a faulty internal mode switch can prevent the transmission from correctly identifying gear positions, leading to shifting problems.

6. Is the P1838 code related to the transmission range sensor?

Yes, the internal mode switch is part of the transmission range sensor system, which detects the gear position.

7. How do I fix the P1838 code on a 2015 Chevrolet Silverado?

Repairs may include replacing the internal mode switch, repairing damaged wiring, cleaning corroded connectors, or reprogramming the transmission control module if needed.

8. Can driving with code P1838 damage my Silverado?

Driving with this code may cause further damage to the transmission or lead to unsafe driving conditions due to improper gear engagement.

9. How much does it cost to repair code P1838 on a 2015 Silverado?

Repair costs vary but typically range from $150 to $500, depending on whether the issue is with the switch, wiring, or module.

10. Can I clear the P1838 code without fixing the issue?

You can clear the code with a scan tool, but it will likely return if the underlying problem is not addressed.

Discuss the causes and fixes for P1838 2015 Chevrolet Silverado OBDII Code

Submit a New Comment

Code P1838 2015 Chevrolet Silverado comments

No comments found for this page.