AutoCodes – Pontiac – P1677 Pontiac

P1677 Pontiac Code - Immobilizer Function Deactivated

Quick Answer

The Engine Control Module (ECM), the Powertrain Interface Module (PIM), and the Body Control Module (BCM) are integral part of the vehicle theft deterrent system. Common causes include Deterrent key not programmed to vehicle, Faulty Deterrent key, Faulty ignition switch. 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: P1677 Pontiac indicates Immobilizer Function Deactivated.
Common causes: Common causes include Deterrent key not programmed to vehicle, Faulty Deterrent key, Faulty ignition switch.
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 2,440

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 Sep 08, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1677 Pontiac Description

The Engine Control Module (ECM), the Powertrain Interface Module (PIM), and the Body Control Module (BCM) are integral part of the vehicle theft deterrent system. The theft deterrent system authenticates the security code programmed into each of these modules to prevent unauthorized vehicle operation. This authentication process includes the following steps:
1.When the ignition is turned ON or the door is unlocked by remote key the BCM and the key exchange security data to verify the correct key is used.
2.Once the correct key has been confirmed and the ignition is turned ON, the PIM and BCM exchange data to confirm the correct BCM and PIM is being used.
3.Once the correct key, BCM, and PIM is confirmed, the PIM and ECM exchange data to allow the vehicle to start.
4.The data exchange processes conducted use various encrypted data exchanges between each of the devices.

OBDII Code P1677 Pontiac - Immobilizer Function Deactivated - AutoCodes.com — P1677 Pontiac Code - Immobilizer Function Deactivated

What does this mean?

What are the Possible Causes of the DTC P1677 Pontiac?

Deterrent key not programmed to vehicle
Faulty Deterrent key
Faulty ignition switch
Poor electrical connection for Deterrent circuit components

How to Fix the DTC P1677 Pontiac?

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 P1677 Pontiac 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.

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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 P1677 Pontiac Code

1. What does OBDII code P1677 mean on a Pontiac?

Code P1677 indicates that the immobilizer function has been deactivated, which may affect the vehicle's anti-theft system.

2. What are the common symptoms of code P1677 in a Pontiac?

Symptoms may include the engine not starting, security warning lights on the dashboard, or intermittent starting issues.

3. What causes the P1677 code to appear in a Pontiac?

Possible causes include a malfunctioning immobilizer system, a faulty key fob or transponder, wiring issues, or a problem with the body control module (BCM).

4. Can a dead key fob battery trigger the P1677 code?

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

5. How can I fix the P1677 code on my Pontiac?

Start by checking the key fob battery, inspecting the immobilizer system wiring, and ensuring the key is properly programmed. If the issue persists, consult a professional for BCM or immobilizer module diagnostics.

6. Does the P1677 code mean my car is at risk of being stolen?

Not necessarily, but the code indicates that the immobilizer function is not working properly, potentially leaving the vehicle less secure.

7. Can clearing the P1677 code solve the issue?

Clearing the code may temporarily reset the system, but the root cause must be addressed to prevent the code from returning.

8. Is the P1677 code specific to Pontiac vehicles?

While the P1677 code is often associated with Pontiac models, other manufacturers may use similar codes for immobilizer-related issues.

9. How much does it cost to fix a P1677 code?

Repair costs can vary depending on the cause, ranging from replacing a key fob battery (low cost) to diagnosing and repairing the immobilizer or BCM (higher cost).

10. Can I still drive my car with a P1677 code?

If the immobilizer is deactivated, the car may not start or could have intermittent starting issues, making it difficult or impossible to drive.