P1682 Code: Understanding and Fixing Ignition Errors

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P1682 is a diagnostic error code that symbolizes a voltage issue with the ignition switch or any other faults in the ignition switch.

P1682 Code Ignition 1 Switch Circuit 2

The ignition system is composed of two circuits: the first one is controlled by the throttle actuator and goes to the ECM. The ignition switch is located in the second ignition voltage circuit (the one in question).

This comprehensive article will explain all you need to know about the P1682 Code Ignition 1 Switch Circuit 2 and how to fix it.

What Is P1682 Code Ignition 1 Switch Circuit 2?

P1682 Code Ignition 1 Switch Circuit 2 is a manufacturer-specific diagnostic fault code for GM vehicles and similar manufacturers that occurs when the ECM/PCM identifies an issue with the ignition switch that is experiencing a voltage issue. Most of the time, the ignition switch circuit is to blame. 

The code appears because the ECM detects a difference in the voltage levels of the two primary power inputs to the ECM. If the ECM detects an issue with the ignition one switch circuit, it will trigger a P1682 code and switch on the check engine light.

– Diagnosing Code P1682

You can diagnose the P1682 error code by checking the voltage levels in the power inputs to your ECM. A scan tool will help in this case. Since ignition switch and fuse issues also give this code, you can also have an idea by checking these features in your car. 

A technician has to do the following to diagnose a P1682 DTC code: 

  • Check the freeze frame data for errors and scan the ECM for codes. 
  • Visually examine each connector and piece of wiring in the circuit. 
  • Look for indications of failure on the ignition switch or test it.
  • Examine the power relay for signs of a problem. 
  • Verify the ECM’s ground and voltage supplies.

– Common Mistakes When Diagnosing a P1682 Code

The most common mistake you can make when diagnosing a P1682 code is not checking all your car’s wiring and connectors carefully for damage. You may also miss the error if you don’t check the ECM for the correct voltage and ground supply. 

– Cost of Diagnosing the Code P1682

You need about 75 to 150 dollars to diagnose the error code P1682 at an auto repair shop. The work hour is required to diagnose the P1682 error code.

Cost of Diagnosing the Code P1682

The length of diagnosis and the labor costs will depend on the region, the brand, and the model of the car and the engine.

What Are the Causes of P1682 Code Ignition 1 Switch Circuit 2?

The causes of P1682 Code Ignition 1 Switch Circuit 2 include a problem with your vehicle’s ignition switch circuit, or it may also be due to wiring issues or problems with the vehicle’s ECM. You will have to find out what the root of the problem is before fixing it.

These are some common causes of P1682 Code Ignition 1 Switch Circuit 2:

– Defective Ignition Switch

The most common cause of P1682 is a defective ignition switch. Before replacing it, you’ll need to test it.

Defective Ignition Switch

The process is relatively straightforward. You can find all the information regarding testing it in this article.

– Blockage of Fuse

As a result of the contraction and expansion of the fuse block, the wire that leads from the ignition can eventually develop a hairline crack. One way to know the problem is when the car won’t work when the engine is hot but starts when the engine is completely cooled off. 

This problem is common in the GMC Envoy, Chevy SSR and Chevy. They all employ a fuse block that is known for doing this.

– Bad ECM

The ECM is the final cause of the P1682 Code Ignition 1 Switch Circuit 2. A faulty ECM could be one of the possible causes. It is better to take your vehicle to an automobile expert at this junction for proper diagnosis. 

What Are the Likely Symptoms of Code P1682?

The likely symptoms of code P1682 are the vehicle not accelerating, engine failure, draining of battery, dashboard light going off, and engine light turning on.

What Are the Likely Symptoms of Code P1682

All GM products that are afflicted by code P1682 share similar common symptoms, which may include one or more of the following.

– The Engine Light Turning On

One of the P1682 code’s most prevalent symptoms is the check engine light. The engine light may be on when this code is activated.

– Vehicle Not Accelerating 

The P1682 code is most likely present when your car isn’t accelerating as it should. Your car’s ability to accelerate properly may experience issues when this code is activated. You probably have this code if your car feels like it is stuck in the mud.

This is often because the P1682 Code may disrupt the flow of electricity to the ignition switch. This causes your car not to accelerate as it should.  

– Dashboard Light Going Out 

Another symptom is when dashboard lights turn off. This can apply to the dashboard lights, taillights, and headlights.

Dashboard Light Going Out

These lights might be turned off when this code is activated. 

– Battery Depletion 

The P1682 error code usually destroys a car’s battery. When this code is activated, the battery may discharge. This may be because the coding affects how the car operates, and one effect is a depleted battery. 

There’s a strong probability that you have the P1682 error code if your battery seems to be degrading more quickly than usual.

Can the P1682 Code be Caused by Cold Weather?

Yes, the P1682 code can be triggered by cold weather. In colder temperatures, issues like low battery voltage can potentially cause the check engine light to illuminate. This particular code indicates a problem with the ignition switch circuit, which can be affected by temperature fluctuations. Therefore, cold weather check engine light causes can include the P1682 code.

Conclusion

Thanks to this comprehensive article, you should now know what a P1682 code is. Let’s have a quick rundown of some of the essential points.

  • P1682 Code Ignition 1 Switch Circuit 2 is a diagnostic error code that symbolizes a voltage issue with the ignition switch or any other faults in the ignition switch.
  • The ignition system is composed of two “circuits.”
  • The most common cause of P1682 is a defective ignition switch.  
  • All GM products that are afflicted by code P1682 share similar common symptoms. 
  • The likely symptoms of code P1682 are the vehicle not accelerating, engine failure, draining of battery, dashboard light going off and engine light turning on.

A P1682 is an error code that appears whenever a faulty ignition switch occurs. So whenever you notice any symptoms or the error code appears on your dashboard, contact your automobile repair center immediately.

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