AutoCodes – Buick – P183C Buick

P183C Buick 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 Buick 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 968

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

What does this mean?

What are the Possible Causes of the DTC P183C Buick?

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 Buick?

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 Buick 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 Buick Code

What does the OBDII code P183C mean for a Buick?

P183C indicates a problem with the Internal Mode Switch 2 D2 circuit, specifically that the circuit voltage is low, which can affect the vehicle's transmission operation.

What symptoms might I experience if my Buick has the P183C code?

Common symptoms include erratic shifting, transmission slipping, inability to enter specific driving modes, and the check engine light being illuminated.

What causes the P183C code to trigger in a Buick?

The code can be triggered by a faulty Internal Mode Switch, damaged wiring or connectors in the circuit, or issues with the transmission control module (TCM).

How can I diagnose the P183C code in my Buick?

To diagnose the code, check for other related trouble codes, inspect the wiring and connectors for damage, and test the Internal Mode Switch for proper operation.

What are some common repairs for the P183C code?

Common repairs include replacing the Internal Mode Switch, fixing any damaged wiring or connectors, and reprogramming or replacing the transmission control module if necessary.

Can driving with the P183C code cause further damage to my vehicle?

Yes, driving with this code can lead to poor transmission performance and may cause additional damage if the underlying issue is not resolved.

Is it safe to drive my Buick if I see the P183C code?

It is generally advisable to avoid driving the vehicle until the issue is diagnosed and repaired, as it can lead to transmission problems.

How much might it cost to fix the P183C code?

Repair costs can vary widely, but they typically range from $100 to $600, depending on whether it involves simple wiring repairs or more complex component replacements.

Should I clear the P183C code after repairs?

Yes, after making the necessary repairs, you should clear the code using an OBDII scanner and then take the vehicle for a drive to ensure the code does not return.