AutoCodes – GMC – P182A GMC

P182A GMC Code - Internal Mode Switch 'A' 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: P182A GMC indicates Internal Mode Switch 'A' 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 2,191

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 P182A GMC 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 A signal circuit voltage is less than 0.7 V, for 1.75 s.

OBDII Code P182A GMC - Internal Mode Switch 'A' Circuit Low Voltage - AutoCodes.com — P182A GMC Code - Internal Mode Switch 'A' Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P182A GMC?

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 P182A 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 P182A 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.

Need more information about the P182A GMC code?

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Need Help with the Code?

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Information for Specific GMC Models

P182A 2014 GMC Sierra — Internal Mode Switch 'A' Circuit Low Voltage
P182A 2015 GMC Sierra — Internal Mode Switch 'A' Circuit Low Voltage
P182A 2016 GMC Sierra — Internal Mode Switch 'A' Circuit Low Voltage
P182A 2017 GMC Sierra — Internal Mode Switch 'A' Circuit Low Voltage
P182A 2018 GMC Sierra — Internal Mode Switch 'A' 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 P182A GMC Code

1. What are the common symptoms of OBDII code P182A GMC?

The common symptoms of OBDII code P182A GMC include issues with shifting gears, hesitation or jerking during acceleration, and the transmission not engaging properly.

2. What can cause the Internal Mode Switch 'A' Circuit Low Voltage code to trigger?

The P182A GMC code is typically triggered by a faulty internal mode switch (IMS) 'A', damaged wiring or connectors related to the IMS, or a malfunction in the transmission control module (TCM).

3. How serious is the P182A GMC fault code?

The P182A GMC code should be addressed promptly to prevent further damage to the transmission system. Ignoring this code can lead to transmission issues and potential safety hazards while driving.

4. How can I diagnose the Internal Mode Switch 'A' Circuit Low Voltage issue?

Diagnosing the P182A GMC code involves using an OBDII scanner to retrieve the trouble code, performing a visual inspection of the IMS and its wiring, and conducting voltage tests to pinpoint the exact cause of the low voltage condition.

5. Can I continue driving my vehicle with the P182A GMC code present?

It is not recommended to continue driving your vehicle with the P182A GMC code active, as it can lead to transmission problems and potential safety risks on the road. It is best to address the issue as soon as possible.

6. How can I repair the Internal Mode Switch 'A' Circuit Low Voltage problem?

Repairing the P182A GMC code may involve replacing the internal mode switch 'A', repairing or replacing damaged wiring or connectors, or reprogramming the transmission control module (TCM) to clear the fault code.

7. Is it possible to reset the P182A GMC code without fixing the underlying issue?

While you can clear the fault code using an OBDII scanner, it is crucial to address the root cause of the problem to prevent the code from reappearing and causing further transmission issues.

8. Can a DIY enthusiast fix the P182A GMC fault code?

Depending on your skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair the P182A GMC code. However, it is recommended to consult a professional mechanic for accurate diagnosis and proper repair.

9. Are there any preventive maintenance tips to avoid the P182A GMC code?

Regularly inspecting the transmission system, checking for any signs of wear or damage, and addressing any shifting issues promptly can help prevent the occurrence of the P182A GMC fault code.

10. How much does it typically cost to repair the Internal Mode Switch 'A' Circuit Low Voltage issue?

The cost of repairing the P182A GMC code can vary depending on the exact cause of the problem, the extent of the repair needed, and the labor rates in your area. It is advisable to obtain quotes from different mechanics to compare prices.