How to Diagnose and Solve P1668 Output Circuit Check Signal High Issues

As a car enthusiast, there’s nothing more satisfying than rolling up your sleeves and getting your hands dirty to fix a car problem. Today, we’re going to tackle the P1668 Output Circuit Check Signal High issue. This is a common problem that can cause your vehicle to perform poorly or even fail to start. But don’t worry, with the right knowledge and tools, you can diagnose and solve this issue yourself. Let’s dive in!

Understanding the P1668 Code

First things first, what does the P1668 code mean? This code is triggered when the Powertrain Control Module (PCM) detects a problem with the output circuit. This could be due to a variety of reasons, such as a faulty PCM, wiring issues, or a malfunctioning output device.

Signs of a P1668 Code

How do you know if your vehicle has a P1668 issue? Here are some common symptoms:

– The check engine light is on
– The vehicle fails to start
– Poor fuel economy
– The engine runs roughly or stalls

Diagnosing the P1668 Code

Now that we know what to look for, let’s move on to diagnosing the problem.

Step 1: Use an OBD-II Scanner

The first step in diagnosing a P1668 code is to use an OBD-II scanner. This device can read the trouble codes stored in your vehicle’s computer. Simply connect the scanner to your vehicle’s diagnostic port, usually located under the dashboard, and follow the instructions on the scanner.

Step 2: Inspect the Wiring and Connectors

Next, inspect the wiring and connectors related to the PCM and output devices. Look for any signs of damage, corrosion, or loose connections. If you find any issues, repair or replace the affected parts.

Step 3: Check the PCM

Finally, check the PCM itself. This is a bit more complex and may require professional assistance. If the PCM is faulty, it will need to be replaced.

Solving the P1668 Code

Once you’ve diagnosed the problem, it’s time to solve it.

Step 1: Repair or Replace Damaged Wiring or Connectors

If you found any issues with the wiring or connectors, repair or replace them. This is usually a straightforward process, but make sure to disconnect the battery before starting any electrical work.

Step 2: Replace the PCM

If the PCM is the culprit, it will need to be replaced. This is a more complex task and may require professional assistance. However, if you’re comfortable with it, you can do it yourself. Just make sure to follow the manufacturer’s instructions carefully.

Step 3: Clear the Trouble Codes

After fixing the issue, use the OBD-II scanner again to clear the trouble codes. This will turn off the check engine light and reset the system.

Preventing P1668 Issues

Prevention is always better than cure. Regular maintenance and inspections can help prevent P1668 issues. Make sure to check the wiring and connectors regularly and replace any worn-out parts promptly.

Conclusion

Fixing a P1668 Output Circuit Check Signal High issue may seem daunting, but with the right knowledge and tools, you can do it yourself. Remember, regular maintenance is key to preventing such issues. Happy motoring!

FAQs

1. What does a P1668 code mean?

A P1668 code is triggered when the Powertrain Control Module (PCM) detects a problem with the output circuit.

2. How can I diagnose a P1668 code?

You can diagnose a P1668 code by using an OBD-II scanner and inspecting the wiring, connectors, and PCM.

3. How can I prevent P1668 issues?

Regular maintenance and inspections can help prevent P1668 issues. Make sure to check the wiring and connectors regularly and replace any worn-out parts promptly.