P1694 code — how to fix error fast

While most OBD2 codes may inform you of the problem that may affect your car’s powertrain, the P1694 code can serve as a warning in a different sense. If you aren’t familiar with this code, we don’t blame you, but it’s one of the most common OBD2 codes related to the engine’s operation.

So, we decided to take things into our own hands and give you a guide on P1694 code meaning, potential causes, and ways of diagnosing and fixing it to help you out. This code could also potentially cause trouble recognizing serious engine-related issues on time, so we’ll make sure that never happens to you by giving you a list of preventive measures to take in the end.

Why you can trust REREV’s OBD2 code advice: Our automotive expert researchers with experienced mechanics undertakes a thorough research methodology to deliver precise insights on OBD codes. Find out more about OBD2 codes research process..

What does the P1694 code mean?

The P1694 code is a generic powertrain code that indicates a problem with the “check engine light” (CEL) circuit. The circuit is responsible for turning the “check engine” light on and off. When the”check engine light” circuit detects a problem, it will trigger the P1694 code, and the “check engine” light will come on.

The consequences of this code can vary depending on the severity of the problem. In some cases, the “check engine light” may come on intermittently, while in other cases, it may stay on permanently. If left unaddressed, the code can result in reduced fuel efficiency, decreased engine performance, and potential damage to other vital systems.

Plus, if the code affects the circuit in such a way that prevents it from sending the signal to the dash when the “check engine light” should be on, it could prevent you from recognizing engine issues on time in case there’s an emergency.

What causes the P1694 code?

Even though this code mostly appears when there’s an issue with the “check engine” light circuit, there are a few other issues that could result in this malfunction down the line as a consequence. So, dealing with the most common causes of this code is necessary to help determine the exact source of the trouble, so here’s a list of the most common ones:

Faulty “check engine” light circuit

A faulty Check Engine Light circuit is one of the most common causes of the P1694 code. The Check Engine Light circuit may have a bad connection or a damaged wire, which can trigger the code.

Failed “check engine” light bulb

If the Check Engine Light bulb has failed, it may trigger the code. This is because the Check Engine Light circuit is designed to turn on the Check Engine Light when it detects a problem. If the bulb is not working, the circuit will not be able to turn on the Check Engine Light, which can trigger the P1694 code.

Failed instrument cluster

The instrument cluster is responsible for displaying the Check Engine Light on your dashboard. If the instrument cluster has failed, it may not be able to display the Check Engine Light, which can trigger the code.

Faulty PCM

The Powertrain Control Module (PCM) is responsible for monitoring various systems in your car, including the Check Engine Light circuit. If the PCM has failed, it may not be able to detect problems with the Check Engine Light circuit, which can trigger the P1694 code.

Which car models does the code P1694 affect the most?

The P1694 code can affect various car models, including Chrysler, Dodge, and Jeep vehicles. However, it’s essential to note that not all models are affected equally. Some models are more likely to experience the code than others and we’ll briefly explain what these models are:

• Dodge Neon: The Dodge Neon is one of the most commonly reported vehicles to experience this code. This issue has been linked to a variety of problems, including faulty wiring harnesses and malfunctioning ECMs.
• Chrysler PT Cruiser: The PT Cruiser is another popular vehicle that has been known to experience issues with this code. Some drivers have reported that this issue can be caused by a faulty throttle position sensor or a damaged wiring harness.
• Jeep Grand Cherokee: The Jeep Grand Cherokee has also been reported to experience problems with the P1694 code. In some cases, this issue has been linked to a defective ECM or a malfunctioning accelerator pedal position sensor.

How to diagnose the P1694 code

Diagnosing the code depends on several things, and the most important one is to know which method to use. Of course, this can vary based on the exact source of the issue, so this is where the mentioned possible causes come in handy. Now that you know about all of these, it is time to put it at work by checking for each of these issues:

Inspect the “check engine” light bulb

The first step in diagnosing the P1694 code is to check the Check Engine Light bulb. If the bulb is not working, it may trigger the code. Replace the bulb if necessary.

Check the instrument cluster

If the Check Engine Light bulb is working correctly, check the instrument cluster. Use a scan tool to check for any instrument cluster-related trouble codes. If the instrument cluster has failed, it may need to be replaced.

Check the CEL circuit

If the instrument cluster is working correctly, check the Check Engine Light circuit. Use a multimeter to test the circuit for continuity. If there is no continuity, check for any damaged wires or bad connections.

Examine the operation of the PCM

If the Check Engine Light circuit is working correctly, check the Powertrain Control Module (PCM). Use a scan tool to check for any PCM-related trouble codes. If the PCM has failed, it may need to be replaced.

How to fix the P1694 code

Now that you’ve successfully pinpointed the issue behind this code, it’s time to figure out a solution. Here’s what you may be able to do to fix the code:

Repair the damaged wiring

One of the most common causes of the P1694 code is damaged or faulty wiring in the throttle control circuit. You can check the wiring and repair any damaged connections as needed.

Repair a faulty “check engine” light circuit

If there is a problem with the check engine light circuit, it can cause the engine control module (ECM) to trigger the code. In this case, repairing the faulty check engine light circuit can solve the issue.

Updating the PCM

Sometimes, all that’s needed to clear the code is to update the PCM’s software and reprogram it to restore its original operation. However, if the PCM is faulty and resetting it won’t help, you may need to consider replacing it or buying a remanufactured one for your car which can be expensive in both scenarios.

How to prevent the P1694 code

Preventing the P1694 code requires routine maintenance and proper care of your car’s vital systems. Here are some preventative measures you can take:

• Perform routine maintenance on your car, including oil changes, tune-ups, and regular inspections.
• Keep your car’s vital systems, such as the engine, transmission, brakes, steering, suspension, and electrical components, in good condition.
• Avoid driving your car when the Check Engine Light is on.
• If you notice any symptoms of the P1694 code, such as rough idling or reduced fuel efficiency, have your car checked by a professional mechanic immediately.

This should be enough to set you on the right track regarding dealing with the code and preventing it from re-occurring once it’s cleared.

Our take

Overall, false alarms regarding a “check engine” light or the light being unable to glow up on your dash can be pretty serious. In these situations, all you need to do is find a reliable source of information as to how you can solve the code, which is why we are confident that pieces of advice from our automotive experts will suffice for clearing the code.