Engine-Codes.com
Engine-Codes – GMC – P1679 GMC

P1679 GMC Code - Immobilizer Environment Identification Failed

Quick Answer

The P1679 GMC code indicates that the immobilizer environment identification has failed. Common causes include Faulty key fob, Malfunctioning antenna, Issues with the vehicle's computer. 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
P1679 GMC indicates Immobilizer Environment Identification Failed.
Common causes
Common causes include Faulty key fob, Malfunctioning antenna, Issues with the vehicle's computer.
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 10, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P1679 GMC Description

The P1679 GMC code indicates that the immobilizer environment identification has failed. The immobilizer system is designed to prevent unauthorized access to the vehicle by using an electronic key fob that communicates with the vehicle's computer. When the immobilizer environment identification fails, it means that the vehicle's computer is not able to properly authenticate the key fob, leading to a security issue.

OBDII Code P1679 GMC - Immobilizer Environment Identification Failed
P1679 GMC Code - Immobilizer Environment Identification Failed

Common Causes of P1679 GMC

  1. Faulty key fob
  2. Malfunctioning antenna
  3. Issues with the vehicle's computer
  4. Wiring or connection problems in the immobilizer system

Symptoms of P1679 GMC

  1. Engine cranks but does not start
  2. Engine stalls shortly after starting
  3. Security light flashing on the dashboard
  4. Inability to start the engine even with a working key fob

How to Fix P1679 GMC

  1. Check the key fob battery: Start by replacing the battery in the key fob to ensure it is not causing the issue.
  2. Inspect the antenna: Check the antenna for any damage or loose connections that could be affecting the signal reception.
  3. Reset the immobilizer system: Try resetting the immobilizer system by disconnecting the battery for a few minutes and then reconnecting it.
  4. Check for fault codes: Use a diagnostic scanner to check for any other fault codes that could be related to the immobilizer system.
  5. Seek professional help: If the issue persists, it is recommended to take the vehicle to a certified mechanic or dealership for further diagnosis and repair.

Cost to Fix P1679 GMC

The cost of repairing a P1679 GMC code can vary depending on the specific cause of the issue. In general, replacing a key fob battery or resetting the immobilizer system may cost around $50-$100. However, if the issue is more complex and requires replacing components or reprogramming the immobilizer system, the cost could range from $200 to $500 or more. Additionally, labor costs can vary between $80 and $150 per hour, so it's advisable to check with local auto repair shops for a more accurate estimate.

Need more information about the P1679 GMC code?

Need more information on how to fix the P1679 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1679 GMC 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 P1679 GMC Code

1. What does the OBDII code P1679 mean on a GMC vehicle?

P1679 indicates that the immobilizer system failed to identify the environment, preventing proper communication between the vehicle's security system and the engine control module (ECM).

2. What are the common symptoms of code P1679 on a GMC?

Symptoms may include failure to start the vehicle, immobilizer warning light activation, and loss of communication between the key fob and the vehicle's security system.

3. What causes the P1679 code to appear on a GMC?

Common causes include a faulty immobilizer control unit, damaged key fob, wiring issues, or a malfunction in the ECM.

4. Can a dead key fob battery trigger the P1679 code?

Yes, a dead or weak key fob battery can prevent proper communication with the immobilizer system, potentially triggering this code.

5. How can you fix code P1679 on a GMC vehicle?

Repairs may involve reprogramming the immobilizer system, replacing the key fob, fixing wiring issues, or addressing problems within the ECM.

6. Is the P1679 code specific to GMC vehicles?

No, while P1679 is common for GMC vehicles, it can appear in other makes and models with similar immobilizer systems.

7. Can you clear the P1679 code without fixing the issue?

Clearing the code without addressing the underlying problem may only temporarily remove it, and the issue will likely recur.

8. Does the P1679 code prevent the vehicle from starting?

Yes, this code often results in a no-start condition due to immobilizer system failure.

9. Can a broken or damaged key fob cause the P1679 code?

Yes, a damaged or unprogrammed key fob may fail to communicate with the immobilizer system, leading to this error.

10. Do you need a professional to fix the P1679 code on a GMC?

While some fixes, like replacing a key fob battery, can be done by the owner, diagnosing and repairing wiring or ECU issues typically requires professional assistance.

Discuss the causes and fixes for P1679 GMC OBDII Code

Submit a New Comment

Code P1679 GMC comments

No comments found for this page.