AutoCodes – Generic – P183C

P183C Code - Internal Mode Switch 2 D2 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: P183C indicates Internal Mode Switch 2 D2 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 2,369

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 P183C 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 P183C - Internal Mode Switch 2 D2 Circuit Low Voltage - AutoCodes.com — P183C Code - Internal Mode Switch 2 D2 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P183C?

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 P183C?

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 P183C 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 P183C code?

Need more information on how to fix the P183C code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P183C code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P183C Buick — Internal Mode Switch 2 D2 Circuit Low Voltage
P183C Cadillac — Internal Mode Switch 2 D2 Circuit Low Voltage
P183C Chevrolet — Internal Mode Switch 2 D2 Circuit Low Voltage
P183C GMC — Internal Mode Switch 2 D2 Circuit Low Voltage
P183C Infiniti — Decel G Sensor
P183C Nissan — Decel G Sensor

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 P183C Code

1. What are the common symptoms of OBDII code P183C (Internal Mode Switch 2 D2 Circuit Low Voltage)?

The common symptoms of code P183C include issues with shifting gears, difficulty engaging specific gears, and potential illumination of the Check Engine Light.

2. What are the possible causes of OBDII code P183C?

The possible causes of code P183C can include a faulty internal mode switch, damaged wiring or connectors in the circuit, or issues with the transmission control module.

3. How serious is OBDII code P183C (Internal Mode Switch 2 D2 Circuit Low Voltage)?

Code P183C can affect the proper functioning of the transmission system, leading to potential drivability issues. It is recommended to address this code promptly to avoid further damage.

4. What should I do if I encounter OBDII code P183C?

If you encounter code P183C, it is advisable to have a professional mechanic or technician diagnose the issue to determine the exact cause and necessary repairs.

5. Can I continue driving with OBDII code P183C present?

It is not recommended to continue driving with code P183C present, as it can impact the performance and safety of your vehicle. Seek professional assistance to address the underlying problem.

6. How can I repair OBDII code P183C?

Repairing code P183C may involve replacing the internal mode switch, repairing damaged wiring or connectors, or reprogramming the transmission control module. A qualified technician can perform these tasks.

7. Is it possible to reset OBDII code P183C without repairs?

While clearing the code may temporarily turn off the Check Engine Light, it is crucial to address the root cause of P183C to prevent recurring issues with the transmission system.

8. How much does it cost to fix OBDII code P183C?

The cost to fix code P183C can vary depending on the specific repairs needed, parts required, and labor costs. It is recommended to obtain a detailed estimate from a professional repair shop.

9. Can a DIY enthusiast diagnose and repair OBDII code P183C?

Diagnosing and repairing code P183C may require specialized tools and technical knowledge related to transmission systems. It is advisable to consult a professional for accurate diagnosis and repair.

10. How can I prevent OBDII code P183C from occurring in the future?

Regular maintenance, including checking and servicing the transmission system, can help prevent issues like code P183C. Promptly addressing any related symptoms or warning lights can also help prevent further damage.