AutoCodes – Generic – P182B

P182B Code - Internal Mode Switch 'B' Circuit Low Voltage

Quick Answer

The internal mode switch indicates the Transmission Control Module (TCM) which gear position the vehicle operator has selected. Common causes include Faulty Transmission Internal Mode Switch, Transmission Internal Mode Switch harness is open or shorted, Transmission Internal Mode Switch 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: P182B indicates Internal Mode Switch 'B' Circuit Low Voltage.
Common causes: Common causes include Faulty Transmission Internal Mode Switch, Transmission Internal Mode Switch harness is open or shorted, Transmission Internal Mode Switch 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 10,673

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 Mar 23, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P182B Description

The internal mode switch indicates the Transmission Control Module (TCM) which gear position the vehicle operator has selected. The internal mode switch consists of 5 separate hall effect switches. Each hall effect switch is supplied with a 9 V reference circuit and a signal circuit from the TCM. Each signal circuit for each gear selector position will have either a voltage reading of 0.70–0.96 V indicating On or 1.68–2.38 V indicating Off. The voltage values on each internal mode switch circuit will change and are dependent on the position of the gear selector. The state of each internal mode switch A/B/C/P/S signal circuit is displayed on the scan tool. The Diagnostic Trouble Code (DTC) will be set when the TCM has detected the internal mode switch B signal circuit voltage is less than 0.7 V, for 1.75 s.

OBDII Code P182B - Internal Mode Switch 'B' Circuit Low Voltage - AutoCodes.com — P182B Code - Internal Mode Switch 'B' Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P182B?

Faulty Transmission Internal Mode Switch
Transmission Internal Mode Switch harness is open or shorted
Transmission Internal Mode Switch circuit poor electrical connection
Faulty Transmission Control Module (TCM)

How to Fix the DTC P182B?

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 P182B 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 P182B code?

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Information for Specific Makes

P182B Buick — Internal Mode Switch 'B' Circuit Low Voltage
P182B Cadillac — Internal Mode Switch 'B' Circuit Low Voltage
P182B Chevrolet — Internal Mode Switch 'B' Circuit Low Voltage
P182B GMC — Internal Mode Switch 'B' Circuit Low Voltage

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 P182B Code

1. What does OBDII code P182B mean?

P182B indicates that the Internal Mode Switch (IMS) 'B' circuit is experiencing low voltage, which can disrupt proper transmission operation.

2. What are the common symptoms of a P182B code?

Symptoms may include erratic shifting, the transmission stuck in one gear, poor performance, or the check engine light being illuminated.

3. What causes the P182B code to appear?

This code can be caused by faulty wiring or connections, a malfunctioning Internal Mode Switch, a failed transmission control module (TCM), or low transmission fluid levels.

4. How do I diagnose a P182B code?

Check for damaged or corroded wiring in the IMS 'B' circuit, inspect the Internal Mode Switch for faults, and test the voltage and continuity of the circuit.

5. Can I drive with a P182B code?

Driving with this code is not recommended, as it can lead to transmission damage or unsafe driving conditions due to improper gear shifting.

6. How can I fix a P182B code?

Repairs may involve replacing the Internal Mode Switch, repairing damaged wiring or connectors, updating or reprogramming the TCM, or refilling low transmission fluid.

7. Is the P182B code specific to certain vehicles?

While the code is more common in vehicles with automatic transmissions, its meaning and cause can vary slightly between manufacturers.

8. What tools are needed to troubleshoot a P182B code?

Youâ€™ll typically need an OBDII scanner, a multimeter for voltage testing, and possibly a repair manual for the specific vehicle model.

9. How much does it cost to fix a P182B code?

Repair costs vary depending on the issue. Replacing the Internal Mode Switch can cost $150â€“$400, while wiring repairs or TCM updates may be less expensive.

10. Can low transmission fluid cause a P182B code?

Yes, low transmission fluid can cause improper operation of the Internal Mode Switch, potentially leading to this code.