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P1762 2018 GMC Sierra Code - Transmission Mode Switch Signal Message

Quick Answer

The P1762 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the transmission mode switch signal message. Common causes include Faulty transmission mode switch, Damaged or corroded wiring/connectors between mode switch and TCM, Malfunctioning TCM. 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 mode switch, Damaged or corroded wiring/connectors between mode switch and TCM, Malfunctioning TCM.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code P1762 2018 GMC Sierra Description

The P1762 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the transmission mode switch signal message. This code indicates that there is a malfunction in the communication between the transmission control module (TCM) and the transmission range sensor, also known as the mode switch. The mode switch is responsible for informing the TCM of the gear selection made by the driver, such as park, reverse, neutral, drive, etc. When this signal is not received or is incorrect, it can lead to various issues with the vehicle's transmission system.

OBDII Code P1762 2018 GMC Sierra - Transmission Mode Switch Signal Message
P1762 2018 GMC Sierra Code - Transmission Mode Switch Signal Message

Common Causes of P1762 2018 GMC Sierra

  1. Faulty transmission mode switch
  2. Damaged or corroded wiring/connectors between mode switch and TCM
  3. Malfunctioning TCM
  4. Low transmission fluid level or contaminated fluid
  5. Electrical issues such as a blown fuse or relay related to the transmission system

Symptoms of P1762 2018 GMC Sierra

  1. Erratic shifting behavior
  2. Delayed engagement when shifting gears
  3. Inability to shift into certain gears
  4. Illumination of the Check Engine Light
  5. Reduced fuel efficiency

How to Fix P1762 2018 GMC Sierra

  1. Begin by conducting a thorough inspection of the mode switch, wiring, and connectors for any visible damage or corrosion.
  2. Test the mode switch using a multimeter to ensure it is sending the correct signals to the TCM.
  3. Check the transmission fluid level and condition, topping off or replacing as necessary.
  4. Scan the TCM for any stored fault codes and address any additional issues that may be present.
  5. If the mode switch is found to be faulty, replace it with a new unit and retest the system.

Cost to Fix P1762 2018 GMC Sierra

The cost of repairing a P1762 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a transmission mode switch can range from $150 to $300, including parts and labor. Additional costs may apply if there are other underlying issues that need to be addressed. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to check with local providers for a more accurate estimate.

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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 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 won’t fix the underlying problem. Proper diagnosis and repair are necessary to resolve the issue.

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