AutoCodes – GMC – P183C GMC

P183C GMC 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 GMC 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,045

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC P183C 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 P183C 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 P183C 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.

Need more information about the P183C GMC code?

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

Need Help with the Code?

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

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 GMC Code

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

- Common symptoms include difficulty shifting gears, rough shifting, and the inability to engage certain gears.

2. What can cause OBDII code P183C GMC to trigger?

- This code is typically triggered by a malfunction in the internal mode switch 2 D2 circuit, often due to wiring issues or a faulty internal mode switch.

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

- While the vehicle may still be operable with this code present, it can lead to shifting problems and potentially affect the overall performance of the transmission.

4. Can I continue driving my vehicle with OBDII code P183C GMC present?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further transmission issues if left unresolved.

5. How can I diagnose OBDII code P183C GMC - Internal Mode Switch 2 D2 Circuit Low Voltage?

- Diagnosis typically involves using a scan tool to retrieve the code, checking the internal mode switch and related wiring for any visible damage, and conducting further testing as necessary.

6. What are some repair tips for addressing OBDII code P183C GMC?

- Repair tips may include repairing or replacing damaged wiring, testing and replacing the internal mode switch if necessary, and clearing the code to see if the issue persists.

7. Can a DIY enthusiast fix OBDII code P183C GMC themselves?

- While some DIY enthusiasts may be able to address this issue themselves, it is recommended to have a professional mechanic diagnose and repair the underlying cause to ensure proper resolution.

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

- The cost of repairing this code can vary depending on the root cause of the issue, but it may involve costs associated with parts replacement, labor, and diagnostic fees.

9. Can a faulty internal mode switch cause other transmission problems besides triggering OBDII code P183C GMC?

- Yes, a faulty internal mode switch can cause a range of transmission issues, including erratic shifting, incorrect gear selection, and potential transmission failure if not addressed promptly.

10. Is it necessary to clear OBDII code P183C GMC after repairing the issue?

- Yes, it is important to clear the code after repairing the underlying problem to reset the system and ensure that the issue has been successfully resolved.