AutoCodes – Cadillac – P183B Cadillac

P183B Cadillac 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 Cadillac 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 1,036

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

What does this mean?

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

1. What does the OBDII code P183B mean on a Cadillac?

The P183B code indicates a high voltage issue in the Internal Mode Switch 2 D1 circuit, which is part of the transmission control system.

2. What are the common symptoms of code P183B?

Symptoms may include erratic transmission shifting, the inability to change gears, the transmission being stuck in one gear, or the activation of the check engine light.

3. What causes the P183B code to appear?

Common causes include a faulty internal mode switch, damaged wiring or connectors in the D1 circuit, or issues with the transmission control module (TCM).

4. Can I drive my Cadillac with a P183B code?

Driving with this code is not recommended as it may cause further damage to the transmission or lead to unsafe driving conditions due to shifting problems.

5. How is the P183B code diagnosed?

A technician will use a scan tool to confirm the code, inspect wiring and connectors for damage, and test the internal mode switch and related circuits for proper operation.

6. How can I fix the P183B code on my Cadillac?

Repairs may include replacing the internal mode switch, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the transmission control module.

7. How much does it cost to fix a P183B code?

Repair costs vary but typically range from $150 to $500, depending on whether the issue is with the switch, wiring, or TCM.

8. Can a bad battery cause the P183B code?

While unlikely, a weak or failing battery can sometimes cause electrical issues that might affect the transmission system. Itâ€™s worth checking the battery as part of the diagnostic process.

9. Does the P183B code always mean the internal mode switch needs replacement?

No, the issue could also be related to wiring, connectors, or the TCM. Proper diagnosis is essential to pinpoint the exact cause.

10. Is the P183B code specific to Cadillac vehicles?

While the code can appear on other vehicles, its definition and the affected components may vary. On Cadillacs, it specifically refers to the Internal Mode Switch 2 D1 Circuit.