AutoCodes – GMC – P182A 2014 GMC Sierra

P182A 2014 GMC Sierra 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 2014 GMC Sierra 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 187

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P182A 2014 GMC Sierra 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 2014 GMC Sierra - Internal Mode Switch 'A' Circuit Low Voltage - AutoCodes.com — P182A 2014 GMC Sierra Code - Internal Mode Switch 'A' Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P182A 2014 GMC Sierra?

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 2014 GMC Sierra?

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 2014 GMC Sierra 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 2014 GMC Sierra code?

Need more information on how to fix the P182A 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P182A 2014 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 2014 GMC Sierra Code

1. What does the OBDII code P182A mean on a 2014 GMC Sierra?

P182A indicates an issue with the Internal Mode Switch 'A' Circuit, specifically a low voltage condition detected by the transmission control module (TCM).

2. What are the common symptoms of a P182A code in a 2014 GMC Sierra?

Symptoms may include erratic shifting, the transmission stuck in one gear, the check engine light illuminated, or reduced power mode.

3. What causes the P182A code to appear on a 2014 GMC Sierra?

Common causes include a faulty internal mode switch, damaged wiring or connectors, a malfunctioning transmission control module (TCM), or low transmission fluid levels.

4. How can I diagnose the P182A code on my GMC Sierra?

Start by inspecting the wiring and connectors for the internal mode switch, check transmission fluid levels, and use a scan tool to monitor live data from the Internal Mode Switch 'A' Circuit.

5. Can I drive my 2014 GMC Sierra with a P182A code?

Itâ€™s not recommended to drive with this code for an extended period, as it may cause further damage to the transmission or result in unsafe driving conditions.

6. How do I fix the P182A code on a 2014 GMC Sierra?

Repairs may involve replacing the internal mode switch, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the TCM if necessary.

7. Is the P182A code related to the transmission?

Yes, the code specifically pertains to the transmissionâ€™s internal mode switch, which helps the TCM determine the gear position.

8. Can low transmission fluid cause the P182A code?

Low or contaminated transmission fluid can contribute to this code, as it may affect the proper operation of the internal mode switch.

9. How much does it cost to repair a P182A code on a GMC Sierra?

Repair costs can vary but may range from $150 to $1,000 depending on whether the issue is with the internal mode switch, wiring, or TCM.

10. Do I need a professional mechanic to fix the P182A code?

If youâ€™re experienced with vehicle diagnostics and repairs, you can attempt basic troubleshooting. However, for more complex issues like TCM replacement or reprogramming, a professional mechanic is recommended.