AutoCodes – Generic – P183A

P183A 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 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 4,119

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

What does this mean?

What are the Possible Causes of the DTC P183A?

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?

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 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.

Need more information about the P183A code?

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Information for Specific Makes

P183A Buick — Internal Mode Switch 2 D1 Circuit Low Voltage
P183A Cadillac — Internal Mode Switch 2 D1 Circuit Low Voltage
P183A Chevrolet — Internal Mode Switch 2 D1 Circuit Low Voltage
P183A GMC — Internal Mode Switch 2 D1 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 P183A Code

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

The common symptoms include issues with shifting gears, difficulty or inability to shift, and the transmission not responding properly.

2. What are some possible causes of OBDII code P183A?

Possible causes of this code include a faulty internal mode switch, damaged wiring or connectors in the circuit, or issues with the transmission control module.

3. How can I diagnose the OBDII code P183A?

Diagnosing this code typically involves using a scan tool to check for the specific error code, inspecting the internal mode switch and its circuit for any visible damage, and testing the wiring and connectors for continuity and proper voltage.

4. Can OBDII code P183A cause damage to other vehicle components?

If left unresolved, this code can potentially lead to further damage to the transmission or transmission control module, impacting the overall performance of the vehicle.

5. How can I repair OBDII code P183A?

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

6. Is it safe to drive with OBDII code P183A present?

It is not recommended to drive with this code present, as it can affect the transmission's functionality and lead to potential safety hazards on the road.

7. Can I reset the OBDII code P183A without fixing the underlying issue?

While you can clear the error code using a scan tool, it is important to address the root cause of the problem to prevent the code from reoccurring.

8. How much does it typically cost to repair OBDII code P183A?

The cost of repairing this code can vary depending on the extent of the damage and the specific components that need to be replaced, but it may range from a couple of hundred dollars to over a thousand dollars.

9. Are there any preventive measures to avoid OBDII code P183A?

Regular maintenance of the transmission system, including checking for any signs of wear or damage, can help prevent issues that may trigger this error code.

10. Can a DIY enthusiast fix OBDII code P183A at home?

While some DIY enthusiasts may have the skills to diagnose and repair this code at home, it is recommended to seek professional help, especially when dealing with transmission-related issues, to ensure proper diagnosis and repair.