AutoCodes – Buick – P183D Buick

P183D Buick Code - Internal Mode Switch 2 D2 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: P183D Buick indicates Internal Mode Switch 2 D2 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 876

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 P183D 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 P183D Buick - Internal Mode Switch 2 D2 Circuit High Voltage - AutoCodes.com — P183D Buick Code - Internal Mode Switch 2 D2 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P183D 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 P183D 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 P183D 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 P183D Buick Code

1. What does the OBDII code P183D mean on a Buick?

P183D refers to "Internal Mode Switch 2 D2 Circuit High Voltage," indicating an issue with the transmission's internal mode switch circuit, where the voltage is higher than expected.

2. What are common symptoms of the P183D code in a Buick?

Symptoms may include the transmission stuck in a single gear, erratic shifting, illumination of the check engine light, or a failure to engage certain gears.

3. What causes the P183D code to appear on a Buick?

Common causes include a faulty internal mode switch, damaged or corroded wiring or connectors in the circuit, or an issue with the transmission control module (TCM).

4. Can I drive my Buick with a P183D code?

Driving with this code is not recommended, as it may lead to transmission damage, poor performance, or unsafe driving conditions due to erratic gear shifting.

5. How do I diagnose a P183D code on a Buick?

Diagnosis involves inspecting the internal mode switch, checking the wiring and connectors for damage or corrosion, and testing the voltage at the switch to ensure it is within specifications.

6. What repairs can fix the P183D code in a Buick?

Repairs might include replacing the internal mode switch, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming or replacing the TCM if necessary.

7. How much does it cost to repair a P183D code on a Buick?

The repair cost varies but typically ranges from $150 to $500, depending on whether the issue is with the switch, wiring, or TCM.

8. Can a dead battery cause the P183D code in a Buick?

While a dead battery itself is unlikely to cause this code, low voltage or electrical issues during startup can sometimes lead to communication errors that trigger codes.

9. Will clearing the code fix the P183D issue in my Buick?

Clearing the code will temporarily turn off the check engine light, but the problem will persist until the underlying issue is repaired.

10. Is the P183D code specific to Buicks?

No, the P183D code is not exclusive to Buicks, but its diagnosis and repair procedures can vary depending on the make and model. Always consult your vehicleâ€™s service manual or a professional mechanic for accurate guidance.