AutoCodes – GMC – P183B GMC

P183B GMC Code - Internal Mode Switch 2 D1 Circuit High 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: P183B GMC indicates Internal Mode Switch 2 D1 Circuit High 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 971

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 P183B 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 P183B GMC - Internal Mode Switch 2 D1 Circuit High Voltage - AutoCodes.com — P183B GMC Code - Internal Mode Switch 2 D1 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P183B 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 P183B 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 P183B 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 P183B GMC Code

1. What are common symptoms of OBDII code P183B for Internal Mode Switch 2 D1 Circuit High Voltage?

- Common symptoms include issues with shifting gears, lack of response from the transmission, and the transmission staying in one gear.

2. What are possible causes of OBDII code P183B for Internal Mode Switch 2 D1 Circuit High Voltage?

- Possible causes include a faulty internal mode switch, damaged wiring or connectors, a malfunctioning transmission control module, or a short circuit.

3. How can I diagnose OBDII code P183B for Internal Mode Switch 2 D1 Circuit High Voltage?

- Diagnosing this code involves using a scan tool to read the code, inspecting the internal mode switch and related components, and testing the wiring for continuity and shorts.

4. Can I continue driving my vehicle with OBDII code P183B for Internal Mode Switch 2 D1 Circuit High Voltage?

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

5. How do I repair OBDII code P183B for Internal Mode Switch 2 D1 Circuit High Voltage?

- Repair involves replacing the faulty internal mode switch, repairing or replacing damaged wiring, ensuring proper connections, and clearing the code with a scan tool.

6. Is it possible to prevent OBDII code P183B for Internal Mode Switch 2 D1 Circuit High Voltage from occurring?

- Regular maintenance and inspections of the transmission system, including checking for damaged wiring and connectors, can help prevent this code from occurring.

7. How much does it typically cost to repair OBDII code P183B for Internal Mode Switch 2 D1 Circuit High Voltage?

- The cost of repair can vary depending on the extent of the damage and the specific components that need to be replaced, but it can range from a few hundred to over a thousand dollars.

8. Can a DIY enthusiast fix OBDII code P183B for Internal Mode Switch 2 D1 Circuit High Voltage?

- While some experienced DIY enthusiasts may be able to diagnose and repair this code themselves, it is recommended to seek professional help due to the complexity of transmission systems.

9. Are there any recalls or technical service bulletins related to OBDII code P183B for Internal Mode Switch 2 D1 Circuit High Voltage?

- It is recommended to check with the vehicle manufacturer or a trusted mechanic to see if there are any recalls or technical service bulletins related to this specific OBDII code.

10. What should I do if OBDII code P183B for Internal Mode Switch 2 D1 Circuit High Voltage keeps coming back after repair?

- If the code keeps coming back after repair, it may indicate a persistent issue with the internal mode switch or another component, and further diagnosis by a professional is recommended.