AutoCodes – GMC – P1681 GMC

P1681 GMC Code - Control Module Not Programmed

Quick Answer

This diagnostic applies to internal microprocessor integrity conditions within the Engine Control Module (ECM). Common causes include Engine Control Module (ECM) programming error, Wrong Engine Control Module, Faulty Engine Control Module. 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: P1681 GMC indicates Control Module Not Programmed.
Common causes: Common causes include Engine Control Module (ECM) programming error, Wrong Engine Control Module, Faulty Engine Control Module.
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 7,903

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 06, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1681 GMC Description

This diagnostic applies to internal microprocessor integrity conditions within the Engine Control Module (ECM). This Diagnostic Trouble Code (DTC) also addresses if the ECM is not programmed.

OBDII Code P1681 GMC - Control Module Not Programmed - AutoCodes.com — P1681 GMC Code - Control Module Not Programmed

What does this mean?

What are the Possible Causes of the DTC P1681 GMC?

Engine Control Module (ECM) programming error
Wrong Engine Control Module
Faulty Engine Control Module

How to Fix the DTC P1681 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 P1681 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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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 P1681 GMC Code

1. What are the common symptoms of OBDII code P1681 GMC "Control Module Not Programmed"?

The common symptoms include the check engine light illuminating on the dashboard, issues with vehicle starting, and possible performance issues.

2. What does the OBDII code P1681 GMC indicate?

The code P1681 indicates that the Powertrain Control Module (PCM) has not been programmed correctly or is experiencing a communication error.

3. What are the possible causes of OBDII code P1681 GMC?

Possible causes include a faulty PCM, incorrect programming of the PCM, poor electrical connections, or issues with the vehicle's wiring.

4. How can I diagnose OBDII code P1681 GMC?

Diagnosis typically involves using an OBDII scanner to retrieve the code, checking for any other related codes, inspecting the PCM and connections, and performing a programming check.

5. Can I still drive my vehicle with OBDII code P1681 GMC present?

It is not recommended to drive the vehicle with this code present, as it can lead to performance issues and potential safety concerns. It's best to address the issue promptly.

6. How do I repair OBDII code P1681 GMC "Control Module Not Programmed"?

Repair methods may include reprogramming the PCM, checking and repairing any wiring or connection issues, or replacing the PCM if necessary.

7. Is it possible to reset OBDII code P1681 GMC without fixing the underlying issue?

While you can clear the code with an OBDII scanner, it is not recommended to do so without addressing the root cause, as the issue may persist and cause further problems.

8. Can a DIYer fix OBDII code P1681 GMC at home?

While some aspects of diagnosing and repairing this code can be done at home, reprogramming the PCM and certain electrical repairs may require specialized knowledge and tools.

9. How much does it typically cost to repair OBDII code P1681 GMC?

The cost of repair can vary depending on the underlying cause and the specific repairs needed. It's advisable to consult a mechanic for a proper diagnosis and cost estimate.

10. How long does it take to repair OBDII code P1681 GMC?

The repair time can vary based on the complexity of the issue and the repair process involved. Some repairs may be completed quickly, while others may take more time for diagnostics and programming.