AutoCodes – GMC – P183A GMC

P183A GMC Code - Internal Mode Switch 2 D1 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: P183A GMC indicates Internal Mode Switch 2 D1 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 1,096

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 P183A 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 P183A GMC - Internal Mode Switch 2 D1 Circuit Low Voltage - AutoCodes.com — P183A GMC Code - Internal Mode Switch 2 D1 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P183A 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 P183A 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 P183A 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 P183A GMC Code

1. What are the common symptoms of OBDII code P183A GMC Internal Mode Switch 2 D1 Circuit Low Voltage?

The common symptoms include issues with shifting between gears, harsh shifting, and the inability to shift into certain gears.

2. What are the possible causes of the OBDII code P183A GMC Internal Mode Switch 2 D1 Circuit Low Voltage?

Possible causes include a faulty internal mode switch, damaged wiring or connectors related to the internal mode switch, or issues with the transmission control module.

3. How can I diagnose the OBDII code P183A GMC Internal Mode Switch 2 D1 Circuit Low Voltage?

Diagnosis involves using a scan tool to read the code, checking the internal mode switch and its related wiring for damage, and testing the transmission control module for proper functioning.

4. Can I continue driving my vehicle with the OBDII code P183A GMC Internal Mode Switch 2 D1 Circuit Low Voltage?

It is not recommended to continue driving your vehicle with this code as it can lead to further transmission problems and potential safety hazards.

5. How can I repair the OBDII code P183A GMC Internal Mode Switch 2 D1 Circuit Low Voltage?

Repairing this code may involve replacing the internal mode switch, repairing or replacing damaged wiring or connectors, or reprogramming the transmission control module.

6. Is it possible to reset the OBDII code P183A GMC Internal Mode Switch 2 D1 Circuit Low Voltage without fixing the underlying issue?

Resetting the code without addressing the underlying issue may temporarily clear the warning light, but the problem will likely reoccur until properly repaired.

7. How much does it typically cost to repair the OBDII code P183A GMC Internal Mode Switch 2 D1 Circuit Low Voltage?

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

8. Can a DIY enthusiast repair the OBDII code P183A GMC Internal Mode Switch 2 D1 Circuit Low Voltage?

While some aspects of the repair may be possible for experienced DIY enthusiasts, diagnosing and repairing transmission-related issues can be complex and may require professional expertise.

9. Are there any preventive measures to avoid triggering the OBDII code P183A GMC Internal Mode Switch 2 D1 Circuit Low Voltage?

Regular maintenance of the transmission system, including checking for leaks, ensuring proper fluid levels, and promptly addressing any transmission-related symptoms, can help prevent this code from triggering.

10. How long does it take to repair the OBDII code P183A GMC Internal Mode Switch 2 D1 Circuit Low Voltage?

The repair time can vary depending on the specific issue and the expertise of the technician, but it may take a few hours to a full day to diagnose and repair the problem.