AutoCodes – Cadillac – P183C Cadillac

P183C Cadillac 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 Cadillac 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 932

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

What does this mean?

What are the Possible Causes of the DTC P183C Cadillac?

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 Cadillac?

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 Cadillac 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 P183C Cadillac Code

1. What are the common symptoms of OBDII code P183C in a Cadillac?

- Common symptoms include issues with shifting gears, the vehicle staying in a single gear, poor acceleration, and an illuminated Check Engine Light.

2. What does the OBDII code P183C Cadillac indicate?

- The code P183C indicates a problem with the Internal Mode Switch 2 D2 Circuit Low Voltage in the transmission system of the Cadillac.

3. What are the possible causes of OBDII code P183C in a Cadillac?

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

4. How can I diagnose the OBDII code P183C in my Cadillac?

- Diagnosis typically involves using a professional OBDII scanner to retrieve the code, checking the internal mode switch and related wiring for damage, and testing the transmission fluid levels.

5. Is it safe to continue driving with OBDII code P183C in my Cadillac?

- It is not recommended to drive your Cadillac with the P183C code present, as it can lead to further damage to the transmission system and potentially unsafe driving conditions.

6. How can I repair OBDII code P183C in my Cadillac?

- Repair options may include replacing the internal mode switch, repairing or replacing damaged wiring or connectors, ensuring proper transmission fluid levels, and resetting the trouble codes with a scanner.

7. Can a DIY enthusiast fix OBDII code P183C in a Cadillac?

- While some simple tasks like checking wiring connections can be done by DIY enthusiasts, diagnosing and repairing the root cause of the P183C code may require professional knowledge and tools.

8. How much does it typically cost to repair OBDII code P183C in a Cadillac?

- The cost of repairing the P183C code can vary depending on the specific issue and whether you choose to DIY or take your Cadillac to a professional mechanic. Costs may range from a few hundred to over a thousand dollars.

9. Will resetting the Check Engine Light make OBDII code P183C disappear?

- Resetting the Check Engine Light may temporarily turn off the light, but the underlying issue causing the P183C code will still remain, and the code is likely to reappear until the problem is resolved.

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

- Regular maintenance of the transmission system, including checking fluid levels and addressing any warning signs promptly, can help prevent issues like the P183C code from occurring in the future.