AutoCodes – Buick – P184A Buick

P184A Buick Code - Internal Mode Switch 2 S Circuit Low 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
P184A Buick indicates Internal Mode Switch 2 S Circuit Low 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.
AI answers can be wrong. Verify repairs with testing. Open full chat
Code Popularity 869
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jan 30, 2020
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Code P184A Buick 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 P184A Buick - Internal Mode Switch 2 S Circuit Low Voltage - AutoCodes.com
P184A Buick Code - Internal Mode Switch 2 S Circuit Low Voltage

What are the Possible Causes of the DTC P184A Buick?

  • 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 P184A Buick?

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 P184A Buick 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 P184A Buick Code

1. What are the common symptoms of OBDII code P184A in a Buick related to the Internal Mode Switch 2 S Circuit Low Voltage?

Common symptoms include issues with shifting gears, hesitation or jerking when accelerating, and the vehicle going into limp mode.

2. What can cause the Internal Mode Switch 2 S Circuit Low Voltage code P184A in a Buick?

Potential causes include a faulty internal mode switch, damaged wiring or connectors, low transmission fluid level, or problems with the transmission control module.

3. How serious is OBDII code P184A in a Buick related to the Internal Mode Switch 2 S Circuit Low Voltage?

This code should be addressed promptly as it can lead to transmission performance issues and potential safety concerns while driving.

4. Can driving with OBDII code P184A in a Buick cause further damage?

Continued driving with this code may exacerbate transmission problems and potentially lead to more severe issues, so it is recommended to address it as soon as possible.

5. How can I diagnose OBDII code P184A in a Buick for the Internal Mode Switch 2 S Circuit Low Voltage?

Diagnosis typically involves using a scan tool to read the code, checking for any accompanying codes, inspecting the internal mode switch and related components, and testing the circuitry.

6. Is it possible to repair OBDII code P184A in a Buick related to the Internal Mode Switch 2 S Circuit Low Voltage myself?

Depending on your experience and access to tools, you may be able to address this issue yourself by replacing the internal mode switch, repairing wiring or connectors, or topping up transmission fluid.

7. Can resetting the fault codes clear OBDII code P184A in a Buick?

While clearing the fault codes may temporarily turn off the check engine light, the underlying issue causing code P184A will still need to be diagnosed and resolved to prevent it from returning.

8. What are some tips for preventing OBDII code P184A in a Buick related to the Internal Mode Switch 2 S Circuit Low Voltage?

Regularly servicing your vehicle, checking transmission fluid levels, and addressing any shifting problems promptly can help prevent this code from appearing.

9. How much does it typically cost to repair OBDII code P184A in a Buick related to the Internal Mode Switch 2 S Circuit Low Voltage?

The cost of repairs can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

10. Can a mechanic help with diagnosing and repairing OBDII code P184A in a Buick related to the Internal Mode Switch 2 S Circuit Low Voltage?

Yes, a qualified mechanic can assist in diagnosing the issue, determining the appropriate repairs needed, and resolving OBDII code P184A to ensure your vehicle operates smoothly.

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