Fix Common Volvo Truck Ignition Switch Problems Yourself!

Volvo truck ignition switch problems can range from electrical misfires causing jerking and stalling to Guardian Mode activation. These issues can occur from loose connections, corroded terminals, damaged ignition switches, and other causes.

Acknowledging some common symptoms is important to identify the exact troublemaker. Also, it should help if one has an idea of what the problems may look like when the system is failing from a malfunctioning ignition switch.

And that’s what today’s guide is all about!

Navigating Common Volvo Truck Ignition Switch Problems

One of the most common issues that can arise in a 1998 Volvo VNL, especially the ones that are equipped with a VED12 Volvo engine, is ignition switch problems. And this is true for other models as well.

The issue itself can be quite challenging. But then again, you can always take your time to understand the symptoms and figure out initial ways to address them to make the process manageable. So, what are the signs of a bad ignition switch?

The most common signs of a bad ignition switch in a Volvo truck include the engine not starting, the key not turning, unexpected stalling, no sound from the starter motor, a stuck steering wheel, car accessories failing to power on, and flickering dashboard lights. One or more of these issues can indicate potential ignition switch failure.

Several Volvo truck ignition switch problems forums discuss this issue to be deriving from other errors. Let’s talk about those in a bit more depth right below!

1. Electrical Miss and Stalling Problem From Ignition Switch

If you believe that the issue affecting your Volvo truck is an electrical miss, check if the vehicle is jerking in a way that seems it is hitting a pothole.

This often gets followed by stalling. This problem can indeed be quite frustrating to identify and typically it happens from an intermittent power loss in the ignition system. More or less likely, it’s the fault of bad ignition switch contacts.

To troubleshoot this problem, you should start by checking for any loose connections. If the connections seem secure enough, have a good look to find any corroded terminals within the ignition system. 

Both loose or corroded connections will disrupt the electrical flow. And this is often the number one cause behind a Volvo truck showing jerking and stalling symptoms.

Next, you should check around the ignition switch contacts. See if there are any signs of wear or damage. With passing time, it is possible that the contacts can degrade. 

In this regard, I see what GMR means in their report, which highlights that the electrical contacts of ignition switches can degrade over time and result in challenges to maintaining consistent amperage and voltage levels necessary for proper circuit functionality.

As a result, there could be intermittent problems. You should also inspect the ignition relay and make sure it is in good condition and functioning correctly. A faulty relay can also be the lead cause behind power loss and stalling.

Important – A simple reset can often handle the issue quicker and better. Exactly how to reset an ignition switch?

To reset your Volvo truck’s ignition switch, look for the reset button, which is often found near the steering column. You must press and hold this button for a few seconds. Next, you must insert the key into the ignition and turn it to the “ON” position. And that’s it, the reset of the ignition switch is complete.

2. Guardian Mode Activation

So, what exactly happens with Guardian Mode activation that can cause ignition switch issues in Volvo trucks? 

Well, when your engine enters Guardian Mode, it should start operating at a fixed RPM. And this is most typically around 1600 RPM. It is often a signal that is received by a caution light on your dashboard.

As you start exploring the underlying cause, you are likely to find a fault in the Engine Control Module (ECM). And this could be directly related to issues with the ignition switch.

To troubleshoot this error, you need to do some reading and clearing of all fault codes using a diagnostic tool. The step should also involve checking the voltage at the ignition switch. 

This will help you to make sure that it is stable and consistent. And last but not least, you also must inspect the ECM connections and wiring. If you notice any signs of damage or corrosion, it requires quick attention.

3. Engine Fails To Turn Over

If you find that your Volvo truck’s engine won’t crank as soon as you shut it off and try to turn the key again, a blown ignition fuse could be the main cause. Such faulty components can lead to a disturbance of the electrical flow necessary to start the engine.

And if the fuse is not responsible, then there’s a chance that fault lies within the ignition switch itself. It can also be damaged and might stop the Volvo truck from recognizing that you’re trying to start it. You should also check if the airbags are working right in your Volvo truck.

To fix this problem you should start by checking the ignition-related fuses. See if you can figure out any of them that are blown. As soon as you discover, don’t delay in replacing them. And it should be quite all you need to get your engine running again.

You should also consider using a multimeter to test the ignition switch and make sure the part is working correctly. 

If the switch is damaged, it will need to be replaced. Don’t forget the ignition wiring harness. Try to look for any shorts or loose connections. Make sure you take care of those and there are no damaged wires in the system.

4. Accessories Not Powering On

The ignition switch plays a significant role when it comes to delivering power to some accessories. So, If it malfunctions, the power may not reach the truck’s interior lights, radio, and other accessories.

As a result, these accessories will fail to turn on. Consider checking for any LCM-related problem in your Volvo truck that went unnoticed and resulted in disrupting other components.

You should consider verifying the power output from the ignition switch particularly when it’s in the accessory position. This way you can easily determine if the switch is working as it should for the accessories.

There is the wiring that connects to these accessories that you should also inspect. You cannot overlook any damage or loose connections as those can lead to disrupting the power flow. 

Using a multimeter, you can diagnose the ignition switch’s accessory position to measure the electrical output.

Conclusion

Volvo truck ignition switch problems can cause a significant amount of disruption and safety concerns. So, you must take quicker action to systematically diagnose and troubleshoot these issues. 

Be mindful of using only original replacement parts and consider hiring a professional for complicated repairs if needed.

I will see you soon in my next guide!