AutoCodes – Chevrolet – P18B5 2014 Chevrolet Silverado

P18B5 2014 Chevrolet Silverado Code - Internal Mode Switch 'A' Circuit Shorted

Quick Answer

The internal mode switch indicates the Transmission Control Module (TCM) which gear position the vehicle operator has selected. Common causes include Faulty Transmission Internal Mode Switch, Transmission Internal Mode Switch harness is open or shorted, Transmission Internal Mode Switch circuit poor electrical connection. 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 2014 Chevrolet Silverado indicates Internal Mode Switch 'A' Circuit Shorted.
Common causes: Common causes include Faulty Transmission Internal Mode Switch, Transmission Internal Mode Switch harness is open or shorted, Transmission Internal Mode Switch circuit poor electrical connection.
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.

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Code Popularity 224

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 23, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P18B5 2014 Chevrolet Silverado Description

The internal mode switch indicates the Transmission Control Module (TCM) which gear position the vehicle operator has selected. The internal mode switch consists of 5 separate hall effect switches. Each hall effect switch is supplied with a 9 V reference circuit and a signal circuit from the TCM. Each signal circuit for each gear selector position will have either a voltage reading of 0.70–0.96 V indicating On or 1.68–2.38 V indicating Off. The voltage values on each internal mode switch circuit will change and are dependent on the position of the gear selector. The state of each internal mode switch A/B/C/P/S signal circuit is displayed on the scan tool. The Diagnostic Trouble Code (DTC) will be set when the TCM has detected the internal mode switch A signal circuit voltage is between 0.966–1.68 V, for 1.75 s.

OBDII Code P18B5 2014 Chevrolet Silverado - Internal Mode Switch 'A' Circuit Shorted - AutoCodes.com — P18B5 2014 Chevrolet Silverado Code - Internal Mode Switch 'A' Circuit Shorted

What does this mean?

What are the Possible Causes of the DTC P18B5 2014 Chevrolet Silverado?

Faulty Transmission Internal Mode Switch
Transmission Internal Mode Switch harness is open or shorted
Transmission Internal Mode Switch circuit poor electrical connection
Faulty Transmission Control Module (TCM)

How to Fix the DTC P18B5 2014 Chevrolet Silverado?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P18B5 2014 Chevrolet Silverado code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P18B5 2014 Chevrolet Silverado code?

Need more information on how to fix the P18B5 2014 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 2014 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P18B5 in a 2014 Chevrolet Silverado?

- Common symptoms include issues with shifting gears, the vehicle getting stuck in a particular gear, erratic shifting behavior, and possible illumination of the check engine light.

2. What does the OBDII code P18B5 for Internal Mode Switch 'A' Circuit Shorted indicate in a 2014 Chevrolet Silverado?

- This code indicates a short circuit in the internal mode switch 'A' circuit of the transmission range sensor, affecting the proper operation of the transmission.

3. What are the possible causes of OBDII code P18B5 in a 2014 Chevrolet Silverado?

- Possible causes include a faulty internal mode switch, damaged wiring or connectors in the circuit, a short circuit in the wiring, or a malfunctioning transmission range sensor.

4. How can I diagnose OBDII code P18B5 in my 2014 Chevrolet Silverado?

- Diagnosing this code involves using a scan tool to retrieve the specific trouble code, inspecting the internal mode switch and its circuit, checking the wiring and connectors for damage, and testing the transmission range sensor.

5. Can OBDII code P18B5 in a 2014 Chevrolet Silverado be fixed at home?

- Depending on your mechanical skills and access to tools, you may be able to fix this issue at home by replacing the internal mode switch, repairing any damaged wiring, or addressing the short circuit. However, professional diagnosis and repair may be necessary.

6. Is it safe to continue driving with OBDII code P18B5 in a 2014 Chevrolet Silverado?

- It is not recommended to continue driving with this code present, as it can lead to transmission issues and potential safety hazards. It's best to address the problem promptly to prevent further damage.

7. How much does it typically cost to repair OBDII code P18B5 in a 2014 Chevrolet Silverado?

- The cost of repairing this code can vary depending on the exact cause of the issue, the parts needed for replacement, and labor costs. It's advisable to get estimates from trusted mechanics or dealerships.

8. Can a faulty internal mode switch cause other transmission problems besides triggering OBDII code P18B5?

- Yes, a faulty internal mode switch can cause various transmission problems such as incorrect gear selection, harsh shifting, inability to shift gears, or even transmission failure if left unresolved.

9. Are there any preventive maintenance measures to avoid OBDII code P18B5 in a 2014 Chevrolet Silverado?

- Regularly checking and maintaining the transmission system, including the internal mode switch and its wiring, can help prevent issues that may lead to the occurrence of OBDII code P18B5.

10. How long does it usually take to repair OBDII code P18B5 in a 2014 Chevrolet Silverado?

- The repair time for this code can vary based on the exact cause of the issue, availability of parts, and the expertise of the technician. It may take a few hours to a day for diagnosis and repair.