AutoCodes – Generic – P184B

P184B 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 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 3,017

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

What does this mean?

What are the Possible Causes of the DTC P184B?

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?

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 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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Information for Specific Makes

P184B Buick — Internal Mode Switch 2 S Circuit High Voltage
P184B Cadillac — Internal Mode Switch 2 S Circuit High Voltage
P184B Chevrolet — Internal Mode Switch 2 S Circuit High Voltage
P184B GMC — Internal Mode Switch 2 S Circuit High Voltage
P184B Mitsubishi — Shift Fork 4 Malfunction

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 Code

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

- Common symptoms include issues with shifting gears, transmission slippage, and potential check engine light illumination.

2. What are the possible causes of OBDII code P184B?

- The code may be triggered by a faulty internal mode switch, damaged wiring or connectors, or problems with the transmission control module.

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

- Diagnosing the issue typically involves using a scan tool to retrieve the code and checking the internal mode switch, wiring, and connectors for any visible damage or issues.

4. Can I drive my vehicle with OBDII code P184B?

- It is not recommended to drive the vehicle with this code as it can lead to transmission issues and potentially cause further damage.

5. How can I repair OBDII code P184B, Internal Mode Switch 2 S Circuit High Voltage?

- Repair options may include replacing the internal mode switch, repairing or replacing damaged wiring or connectors, or reprogramming the transmission control module.

6. Can a DIY enthusiast fix OBDII code P184B?

- While some experienced DIY enthusiasts may be able to diagnose and repair this code, it is recommended to consult a professional mechanic due to the complexity of transmission-related issues.

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

- The cost of repair can vary depending on the specific cause of the code, but it may range from a few hundred to a few thousand dollars, including parts and labor.

8. Will resetting the check engine light resolve OBDII code P184B?

- Simply resetting the check engine light will not fix the underlying issue causing the code. It is important to diagnose and repair the problem to prevent further damage.

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

- The repair time can vary depending on the specific cause of the code and the complexity of the repair. It may take a few hours to a full day to address the issue.

10. Is OBDII code P184B a common problem in certain vehicle makes and models?

- This code may be more common in certain vehicle makes and models known for transmission issues, but it can occur in any vehicle with an OBDII system.