AutoCodes – GMC – P1762 2018 GMC Sierra

P1762 2018 GMC Sierra Code - Transmission Mode Switch Signal Message

Quick Answer

The Body Control Module (BCM) is constantly sending the Engine Control Module (ECM) and Transmission Control Module (TCM) serial data messages with information regarding transmission mode switch activation. Common causes include Faulty Transmission Control Module (TCM), Faulty Body Control Module (BCM). 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: P1762 2018 GMC Sierra indicates Transmission Mode Switch Signal Message.
Common causes: Common causes include Faulty Transmission Control Module (TCM), Faulty Body Control Module (BCM).
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 Aug 29, 2022

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 P1762 2018 GMC Sierra Description

The Body Control Module (BCM) is constantly sending the Engine Control Module (ECM) and Transmission Control Module (TCM) serial data messages with information regarding transmission mode switch activation. The TCM sets this code when it detects a discrepancy in the structure of the message causing the signal message integrity to be questioned. The Diagnostic Trouble Code (DTC) is set when the TCM detects an error in the rolling count value that does not match with the BCM.

OBDII Code P1762 2018 GMC Sierra - Transmission Mode Switch Signal Message - AutoCodes.com — P1762 2018 GMC Sierra Code - Transmission Mode Switch Signal Message

What does this mean?

What are the Possible Causes of the DTC P1762 2018 GMC Sierra?

Faulty Transmission Control Module (TCM)
Faulty Body Control Module (BCM)

How to Fix the DTC P1762 2018 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 P1762 2018 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 P1762 2018 GMC Sierra code?

Need more information on how to fix the P1762 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1762 2018 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 P1762 2018 GMC Sierra Code

1. What does the OBDII code P1762 mean on a 2018 GMC Sierra?

P1762 indicates an issue with the Transmission Mode Switch Signal Message, which relates to the communication between the transmission control module (TCM) and other components.

2. What are the common symptoms of the P1762 code in a 2018 GMC Sierra?

Symptoms may include erratic shifting, transmission stuck in one gear, failure to engage tow/haul mode, or illumination of the check engine light.

3. What causes the P1762 code to appear on a 2018 GMC Sierra?

Common causes include a faulty transmission mode switch, wiring issues such as damaged or corroded connectors, or a malfunctioning transmission control module (TCM).

4. Can I drive my 2018 GMC Sierra with the P1762 code active?

Driving with this code may lead to reduced performance and potential transmission damage. It's best to address the issue promptly to avoid further problems.

5. How is the P1762 code diagnosed in a 2018 GMC Sierra?

Diagnosis involves scanning for stored codes, inspecting the transmission mode switch and wiring, and testing the TCM for proper communication and functionality.

6. What repairs are typically needed to fix the P1762 code on a 2018 GMC Sierra?

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

7. Is the P1762 code related to the tow/haul mode in a 2018 GMC Sierra?

Yes, the P1762 code can affect the tow/haul mode since it involves the transmission mode switch, which communicates with the TCM to adjust transmission behavior.

8. Can a dead or weak battery cause the P1762 code in a 2018 GMC Sierra?

A weak or dead battery can sometimes cause communication errors between modules, potentially triggering the P1762 code. However, this is less common.

9. How much does it cost to repair the P1762 code on a 2018 GMC Sierra?

Repair costs can vary depending on the issue but typically range from $150 to $800, depending on whether parts like the transmission mode switch or TCM need to be replaced.

10. Can clearing the P1762 code solve the issue on a 2018 GMC Sierra?

Clearing the code may temporarily turn off the check engine light, but it wonâ€™t fix the underlying problem. Proper diagnosis and repair are necessary to resolve the issue.