Today, we’re going to explore the diagnostic trouble code B0090, which relates to an active switch voltage being out of range. This code typically points to an issue within the vehicle’s electrical system, particularly concerning a switch that is not operating as it should.
This could be related to various components, such as the power steering, brake system, or even the transmission. The term “”voltage out of range”” indicates that the voltage being sent from the switch is either too high or too low compared to what the vehicle’s computer expects. This discrepancy can lead to various issues in how the vehicle operates.
Code Symptoms
Common signs include warning lights on your dashboard, such as the check engine light or other system-specific indicators. You may also experience drivability issues like reduced power, erratic shifting, or even a rough idle. In some cases, the vehicle might not respond as expected when you engage certain systems, leading to a frustrating driving experience.
Causes of the Code
It could be a faulty switch that is simply worn out or damaged. Sometimes, the wiring or connectors leading to the switch can become corroded or loose, causing poor electrical connections. Additionally, issues with the vehicle’s power supply, such as low battery voltage or poor ground connections, can also trigger this code. In rarer cases, the vehicle’s engine control module, or ECM, might be at fault, but it’s essential to check the basics first before jumping to that conclusion.
Code Solutions
Start with a visual inspection of the switch and its wiring. Look for any signs of damage, corrosion, or loose connections. Next, check the voltage at the switch using a multimeter to see if it falls within the expected range. If the voltage is off, you may need to trace the wiring back to find any breaks or shorts. It’s also a good idea to verify the vehicle’s battery voltage and check for good ground connections. If your vehicle has a variable valve timing system, ensure that the oil level and quality are adequate, as sludge can affect performance. If everything looks good, you can perform a scan tool actuation test to see if the switch responds correctly when commanded.
After you’ve completed your checks and made any necessary repairs, clear the code and take the vehicle for a road test to see if the issue has been resolved. Remember to always prioritize safety when working on your vehicle. Be cautious of hot components, and if you need to disconnect the battery, make sure to follow proper procedures.
Explanatory video