AutoCodes – Generic – P184A

P184A 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 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.

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Code Popularity 9,398

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 P184A 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 - Internal Mode Switch 2 S Circuit Low Voltage - AutoCodes.com — P184A Code - Internal Mode Switch 2 S Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P184A?

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?

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 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

P184A Buick — Internal Mode Switch 2 S Circuit Low Voltage
P184A Cadillac — Internal Mode Switch 2 S Circuit Low Voltage
P184A Chevrolet — Internal Mode Switch 2 S Circuit Low Voltage
P184A GMC — Internal Mode Switch 2 S Circuit Low Voltage

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 Code

1. What is OBDII code P184A?

OBDII code P184A refers to an issue with the Internal Mode Switch 2 S Circuit, specifically indicating low voltage in the circuit. This switch is part of the transmission control system and helps in determining the transmission's current operating state.

2. What are the common symptoms of code P184A?

Symptoms of code P184A can include transmission slipping, harsh or delayed shifting, the transmission failing to engage certain gears, and in some cases, the vehicle entering limp mode. The check engine light will also be illuminated.

3. What causes the P184A code to be triggered?

The P184A code can be triggered by several issues, including faulty or damaged wiring, a bad internal mode switch, low transmission fluid levels, or electrical connections that are corroded or otherwise compromised.

4. How do I diagnose the P184A code?

Diagnosing the P184A code involves using a scan tool to confirm the code and monitor the switch's voltage readings. Inspecting the transmission wiring harness for damage, checking the transmission fluid level and condition, and testing the internal mode switch and its associated circuits for continuity and resistance are also crucial steps.

5. Can I drive my vehicle with code P184A appearing?

While it might be possible to drive a vehicle with code P184A, it is not advisable. Driving with this error can lead to worsened symptoms such as increased transmission damage, which could lead to more extensive repairs or failure.

6. What repairs can fix the P184A code?

Repairs that can resolve P184A include replacing or repairing any damaged wiring or connectors, replacing the faulty internal mode switch, and addressing any transmission fluid issues such as leaks or low fluid levels.

7. Is there a way to prevent the P184A code from happening?

Preventing code P184A involves regular maintenance of the vehicleâ€™s transmission system, including timely replacement of transmission fluid and ensuring that wiring and electrical components are inspected regularly for signs of wear or damage.

8. What tools are needed to diagnose the P184A code?

Diagnosing the P184A code typically requires a digital multimeter, a scan tool capable of reading transmission-specific codes, and possibly an oscilloscope to check the integrity of signal pathways. Additionally, basic hand tools may be needed to access the transmission and its components.

9. How long does it take to fix code P184A once diagnosed?

The time to fix code P184A can vary based on the specific cause of the fault. Simple repairs like replacing damaged wiring might take a few hours, while replacing more intricate components like the internal mode switch could take longer, especially if parts need to be ordered.