AutoCodes – GMC – P184A GMC

P184A GMC 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 GMC 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 1,938

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

What does this mean?

What are the Possible Causes of the DTC P184A 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 P184A 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 P184A 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 P184A GMC Code

1. What are common symptoms of OBDII code P184A GMC Internal Mode Switch 2 S Circuit Low Voltage?

Common symptoms include issues with shifting gears, hesitation during acceleration, and the inability to start the vehicle.

2. What are the possible causes of OBDII code P184A GMC Internal Mode Switch 2 S Circuit Low Voltage?

Possible causes include a faulty internal mode switch, damaged wiring or connectors, low transmission fluid levels, or a malfunctioning transmission control module.

3. How can I diagnose OBDII code P184A GMC Internal Mode Switch 2 S Circuit Low Voltage?

Diagnosis involves using a diagnostic scanner to read the code, checking the internal mode switch for proper operation, inspecting the wiring and connectors for damage, and testing the transmission control module.

4. Can I continue driving with OBDII code P184A GMC Internal Mode Switch 2 S Circuit Low Voltage?

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

5. How can I repair OBDII code P184A GMC Internal Mode Switch 2 S Circuit Low Voltage?

Repair options include replacing the internal mode switch, repairing damaged wiring or connectors, ensuring proper transmission fluid levels, and recalibrating the transmission control module.

6. Is OBDII code P184A GMC Internal Mode Switch 2 S Circuit Low Voltage a serious issue?

Yes, this code indicates a problem with the transmission system, which is a critical component of the vehicle. It should be addressed promptly to prevent further damage.

7. Can a DIYer fix OBDII code P184A GMC Internal Mode Switch 2 S Circuit Low Voltage?

While some basic troubleshooting steps can be performed by a DIYer, diagnosing and repairing this code may require specialized tools and expertise. It is recommended to consult a professional mechanic for proper diagnosis and repair.

8. How much does it cost to repair OBDII code P184A GMC Internal Mode Switch 2 S Circuit Low Voltage?

The cost of repair can vary depending on the underlying issue causing the code. It is best to get a diagnostic from a mechanic to determine the exact cost of repair.

9. Will resetting the OBDII code P184A GMC Internal Mode Switch 2 S Circuit Low Voltage make it go away permanently?

Resetting the code may temporarily clear the error, but if the underlying issue is not addressed, the code is likely to return. It is important to diagnose and fix the root cause of the problem.

10. Can OBDII code P184A GMC Internal Mode Switch 2 S Circuit Low Voltage be prevented?

Regular maintenance of the transmission system, such as checking fluid levels, inspecting for leaks, and addressing any unusual symptoms promptly, can help prevent this code from appearing.