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P18B5 2017 Chevrolet Silverado Code - Internal Mode Switch 'A' Circuit Shorted

Quick Answer

The P18B5 diagnostic trouble code (DTC) for a 2017 Chevrolet Silverado indicates that there is a short circuit in the Internal Mode Switch 'A' circuit. Common causes include Faulty Internal Mode Switch, Short circuit in the wiring harness, Corrosion or damage to electrical connectors. 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
P18B5 2017 Chevrolet Silverado indicates Internal Mode Switch 'A' Circuit Shorted.
Common causes
Common causes include Faulty Internal Mode Switch, Short circuit in the wiring harness, Corrosion or damage to electrical connectors.
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 13, 2024
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Code P18B5 2017 Chevrolet Silverado Description

The P18B5 diagnostic trouble code (DTC) for a 2017 Chevrolet Silverado indicates that there is a short circuit in the Internal Mode Switch 'A' circuit. The Internal Mode Switch (IMS) is a component of the transmission control system that helps the Powertrain Control Module (PCM) determine the current gear selection and transmission mode. When the PCM detects a short in the circuit related to the IMS, it triggers this code.

OBDII Code P18B5 2017 Chevrolet Silverado - Internal Mode Switch 'A' Circuit Shorted
P18B5 2017 Chevrolet Silverado Code - Internal Mode Switch 'A' Circuit Shorted

Common Causes of P18B5 2017 Chevrolet Silverado

  1. Faulty Internal Mode Switch
  2. Short circuit in the wiring harness
  3. Corrosion or damage to electrical connectors
  4. Issues with the PCM or transmission control module
  5. Electrical interference or grounding issues

Symptoms of P18B5 2017 Chevrolet Silverado

  1. Erratic shifting behavior
  2. Harsh or delayed gear shifts
  3. Transmission slipping
  4. Transmission going into limp mode
  5. Check Engine Light illuminated

How to Fix P18B5 2017 Chevrolet Silverado

  1. Begin by conducting a thorough visual inspection of the wiring harness and connectors associated with the Internal Mode Switch to check for any visible damage, corrosion, or loose connections.
  2. Use a multimeter to test the continuity and resistance of the IMS circuit to pinpoint the location of the short circuit.
  3. If the issue is with the Internal Mode Switch itself, replace the faulty component with a new one following the manufacturer's guidelines.
  4. Repair or replace any damaged wiring or connectors in the circuit to ensure proper electrical connections.
  5. Clear the DTC and perform a test drive to confirm that the issue has been resolved and that the transmission is operating correctly.

Cost to Fix P18B5 2017 Chevrolet Silverado

The typical repair costs for addressing a P18B5 code on a 2017 Chevrolet Silverado can vary depending on the specific cause of the issue. In general, the cost of parts for replacing the Internal Mode Switch or repairing the wiring harness can range from $100 to $300. Labor costs at an auto repair shop can add an additional $100 to $200, with total repair costs typically falling between $200 and $500. It is important to note that these estimates are approximate, and actual costs may vary based on factors such as location, labor rates, and the extent of the repair needed. It is advisable to consult with a qualified mechanic or repair shop for a more accurate cost estimate based on your specific situation.

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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 P18B5 2017 Chevrolet Silverado Code

1. What does the OBDII code P18B5 for a 2017 Chevrolet Silverado indicate?

The code P18B5 on a 2017 Chevrolet Silverado points to an issue with the Internal Mode Switch 'A' Circuit being shorted.

2. What are the common symptoms of the Internal Mode Switch 'A' Circuit Shorted code on a 2017 Chevrolet Silverado?

Common symptoms of this issue may include erratic shifting behavior, incorrect gear selection display on the dashboard, and potential transmission-related problems.

3. What can cause the Internal Mode Switch 'A' Circuit to short on a 2017 Chevrolet Silverado?

Possible causes of this problem can include a faulty internal mode switch, damaged wiring or connectors, water intrusion, or corrosion in the circuit.

4. How do you diagnose the Internal Mode Switch 'A' Circuit Shorted code on a 2017 Chevrolet Silverado?

Diagnosing this code typically involves performing a thorough inspection of the internal mode switch, checking the wiring and connectors for damage, and using a scan tool to gather data on the transmission system.

5. Can driving the 2017 Chevrolet Silverado with the P18B5 code cause further damage?

Continuing to drive the vehicle with the Internal Mode Switch 'A' Circuit Shorted code may lead to transmission issues and potential damage if left unresolved.

6. How can the Internal Mode Switch 'A' Circuit Shorted code on a 2017 Chevrolet Silverado be repaired?

Repairing this issue often involves replacing the faulty internal mode switch, repairing any damaged wiring or connectors, and clearing the trouble codes with a scan tool.

7. Is it safe to continue driving a 2017 Chevrolet Silverado with the P18B5 code illuminated?

It is not recommended to drive the vehicle with the P18B5 code present, as it can lead to further transmission problems and potential safety hazards.

8. Can a DIY enthusiast fix the Internal Mode Switch 'A' Circuit Shorted issue on a 2017 Chevrolet Silverado?

While some DIY enthusiasts may have the skills to address this problem, it is advisable to consult a professional mechanic for an accurate diagnosis and proper repair.

9. How much does it typically cost to repair the P18B5 code on a 2017 Chevrolet Silverado?

The cost of repairing the Internal Mode Switch 'A' Circuit Shorted issue can vary depending on the extent of the damage, but it may range from a few hundred to a thousand dollars at a repair shop.

10. Are there any preventive measures to avoid the Internal Mode Switch 'A' Circuit Shorted code on a 2017 Chevrolet Silverado?

Regular maintenance checks, ensuring proper wiring connections, and addressing any transmission issues promptly can help prevent the occurrence of the P18B5 trouble code.

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