Engine-Codes.com
Engine-Codes – GMC – P1690 GMC

P1690 GMC Code - Engine Control Module Loop Overrun

Quick Answer

The P1690 GMC code indicates that the Engine Control Module (ECM) has detected a loop overrun. Common causes include Faulty Engine Control Module, Poor electrical connections, Software issues within the engine control system. 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
P1690 GMC indicates Engine Control Module Loop Overrun.
Common causes
Common causes include Faulty Engine Control Module, Poor electrical connections, Software issues within the engine control system.
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 07, 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 P1690 GMC Description

The P1690 GMC code indicates that the Engine Control Module (ECM) has detected a loop overrun. This means that the ECM has detected that a process or loop within the engine control system has exceeded the time limit set by the manufacturer. This can lead to a disruption in the communication between various components of the engine control system, resulting in poor engine performance and potentially causing long-term damage if not addressed promptly.

OBDII Code P1690 GMC - Engine Control Module Loop Overrun
P1690 GMC Code - Engine Control Module Loop Overrun

Common Causes of P1690 GMC

  1. Faulty Engine Control Module
  2. Poor electrical connections
  3. Software issues within the engine control system
  4. Overheating of the engine control system components
  5. Corrosion or damage to wiring harnesses

Symptoms of P1690 GMC

  1. Engine misfires
  2. Rough idling
  3. Decreased fuel efficiency
  4. Engine stalling
  5. Illumination of the check engine light

How to Fix P1690 GMC

  1. Diagnose the root cause of the loop overrun by using a diagnostic scanner to read the trouble codes and identify the specific issue.
  2. Inspect and test the Engine Control Module to determine if it is functioning correctly or needs to be replaced.
  3. Check for any loose or corroded electrical connections and repair or replace them as needed.
  4. Update the software within the engine control system to ensure it is operating smoothly.
  5. Inspect and repair any damaged wiring harnesses or components within the engine control system.

Cost to Fix P1690 GMC

The cost of repairing a P1690 GMC code can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, the cost of diagnosing and repairing this issue can range from $200 to $500, including parts and labor. However, it is essential to note that labor rates at auto repair shops can vary based on location, vehicle make and model, and the type of engine. It is advisable to consult local auto repair shops for a more accurate estimate based on your specific circumstances.

Need more information about the P1690 GMC code?

Need more information on how to fix the P1690 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1690 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 P1690 GMC Code

No Frequently Asked Questions about P1690 GMC Code found.

Discuss the causes and fixes for P1690 GMC OBDII Code

Submit a New Comment

Code P1690 GMC comments

No comments found for this page.