AutoCodes – GMC – B1780 GMC

B1780 GMC Code - Theft Lock Enabled For Radio

Quick Answer

Each time the ignition cycles from OFF to ON, the radio receives Vehicle Identification Number (VIN) data over the class 2 communication circuit. Common causes include Clear Radio Theft Information with OBDII Scanner, Faulty Radio, Radio harness is open or shorted. 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: B1780 GMC indicates Theft Lock Enabled For Radio.
Common causes: Common causes include Clear Radio Theft Information with OBDII Scanner, Faulty Radio, Radio harness is open or shorted.
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 671

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 Oct 16, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1780 GMC Description

Each time the ignition cycles from OFF to ON, the radio receives Vehicle Identification Number (VIN) data over the class 2 communication circuit. If the VIN data in the radio memory matches the VIN data it receives over the class 2 communication circuit, the radio will operate normally.

OBDII Code B1780 GMC - Theft Lock Enabled For Radio - AutoCodes.com — B1780 GMC Code - Theft Lock Enabled For Radio

What does this mean?

What are the Possible Causes of the DTC B1780 GMC?

Clear Radio Theft Information with OBDII Scanner
Faulty Radio
Radio harness is open or shorted
Radio circuit poor electrical connection

How to Fix the DTC B1780 GMC?

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 B1780 GMC 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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Get the B1780 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 B1780 GMC Code

1. What are the common symptoms of OBDII code B1780 GMC (Theft Lock Enabled For Radio)?

- The common symptoms include the radio displaying "Theft Lock Enabled" or "LOC" on the screen, preventing the radio from functioning.

2. What are the possible causes of OBDII code B1780 GMC?

- The code B1780 GMC is typically triggered when the radio's theft deterrent system detects unauthorized access or tampering, such as a power loss or a component failure.

3. How can I troubleshoot OBDII code B1780 GMC?

- To troubleshoot this code, start by checking the radio fuse, ensuring the battery is properly connected, and verifying that the radio's security code is entered correctly.

4. Can I reset OBDII code B1780 GMC on my own?

- In some cases, resetting the code can be done by disconnecting the car battery for a few minutes, then reconnecting it. However, you may need the radio's security code to regain functionality.

5. What should I do if my radio displays "Theft Lock Enabled" due to OBDII code B1780 GMC?

- If your radio is locked due to this code, you may need to contact a GMC dealership or a qualified automotive technician to obtain the necessary unlock code.

6. Is it safe to drive with OBDII code B1780 GMC active?

- Yes, it is generally safe to drive with the code active, as it primarily affects the radio functionality and does not impact the vehicle's drivability or safety.

7. Can a DIY enthusiast repair OBDII code B1780 GMC?

- While some basic troubleshooting steps can be done by DIY enthusiasts, repairing the underlying cause of this code may require specialized equipment and knowledge, best left to professionals.

8. How much does it cost to fix OBDII code B1780 GMC?

- The cost of fixing this code can vary depending on the cause of the issue. It may involve simple fixes like re-entering the radio security code or more complex repairs that require professional assistance.

9. Are there any preventive measures to avoid OBDII code B1780 GMC?

- To prevent this code from being triggered, avoid disconnecting the battery without a backup power source for the radio and ensure the security code is readily available in case of power loss.

10. Can OBDII code B1780 GMC affect other vehicle systems?

- OBDII code B1780 GMC is specific to the radio's theft lock system and is unlikely to affect other vehicle systems unless related tampering or wiring issues are present.