AutoCodes – GMC – P184B GMC

P184B GMC Code - Internal Mode Switch 2 S Circuit High Voltage

Quick Answer

The automatic transmission manual shift shaft position switch assembly, also called the internal mode switch assembly, contains two sliding hall-effect switch assemblies attached to the control valve body within the transmission. Common causes include Faulty Manual Shift Shaft Position Switch Assembly, Manual Shift Shaft Position Switch Assembly harness is open or shorted, Manual Shift Shaft Position Switch Assembly 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: P184B GMC indicates Internal Mode Switch 2 S Circuit High Voltage.
Common causes: Common causes include Faulty Manual Shift Shaft Position Switch Assembly, Manual Shift Shaft Position Switch Assembly harness is open or shorted, Manual Shift Shaft Position Switch Assembly 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 1,040

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 Jan 30, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P184B GMC Description

The automatic transmission manual shift shaft position switch assembly, also called the internal mode switch assembly, contains two sliding hall-effect switch assemblies attached to the control valve body within the transmission. The 9 outputs from the switches indicate which position is selected by the transmission manual shaft. Four outputs (A, B, C, P) are range selection inputs to the transmission control module (TCM). Five outputs (R1, R2, D1, D2, S) are direction selection inputs to the hybrid powertrain control module. The Range input signals are represented as TCM scan tool parameters, Internal Mode Switch A, B, C, and P. The Direction input signals are represented as hybrid powertrain control module scan tool parameters, Internal Mode Switch 2 - R1, R2, D1, D2, and S. The input voltage at the modules is high when a switch is open and low when a switch is closed to earth. Each control module independently supplies power and earth to its respective switch assembly.
The hybrid powertrain control module is internal to the power inverter module, often referred to as the drive motor generator power inverter module and is not serviced separately.

OBDII Code P184B GMC - Internal Mode Switch 2 S Circuit High Voltage - AutoCodes.com — P184B GMC Code - Internal Mode Switch 2 S Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P184B GMC?

Faulty Manual Shift Shaft Position Switch Assembly
Manual Shift Shaft Position Switch Assembly harness is open or shorted
Manual Shift Shaft Position Switch Assembly circuit poor electrical connection

How to Fix the DTC P184B GMC?

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 P184B GMC 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.

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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 P184B GMC Code

1. What are the common symptoms of OBDII code P184B GMC (Internal Mode Switch 2 S Circuit High Voltage)?

- Common symptoms include erratic shifting patterns, transmission slipping, and the inability to shift gears properly.

2. What can cause OBDII code P184B GMC to trigger?

- This code is typically triggered by a fault in the internal mode switch 2 S circuit, which may be caused by wiring issues, a faulty switch, or a bad connection.

3. How serious is OBDII code P184B GMC (Internal Mode Switch 2 S Circuit High Voltage)?

- This code can lead to drivability issues and potential transmission problems if left unresolved, so it is important to address it promptly.

4. How can I diagnose the cause of OBDII code P184B GMC?

- Diagnosing this code involves inspecting the internal mode switch, checking the wiring for any damage, and testing the switch for proper operation using a multimeter.

5. What are some repair tips for fixing OBDII code P184B GMC?

- Repair tips include repairing or replacing damaged wiring, cleaning or replacing the internal mode switch, and ensuring all connections are secure and free of corrosion.

6. Can I drive my vehicle with OBDII code P184B GMC?

- It is not recommended to drive your vehicle with this code present, as it can lead to further damage to the transmission or drivetrain components.

7. How much does it typically cost to repair OBDII code P184B GMC?

- The cost of repairing this code can vary depending on the underlying cause, but it may range from $100 to $300 for parts and labor.

8. Are there any preventative measures to avoid OBDII code P184B GMC in the future?

- Regularly inspecting and maintaining the internal mode switch, checking wiring integrity, and addressing any transmission issues promptly can help prevent this code from recurring.

9. How long does it take to fix OBDII code P184B GMC?

- The repair time for this code can vary depending on the complexity of the issue, but it may take anywhere from 1 to 3 hours for a professional mechanic to diagnose and repair the problem.

10. Can resetting the OBDII code P184B GMC clear the issue?

- Resetting the code may temporarily clear the issue, but if the underlying problem is not addressed, the code is likely to reappear. It is important to diagnose and fix the root cause of the code for a permanent solution.