P1604 Toyota Camry: Everything You Need to Know

You’re about to head out in your Toyota Camry when suddenly the car won’t start and the check engine light comes on. You plug in the scanner only to get the P1604 code. What is it, and what actions can you take?

A P1604 code simply means startability malfunction. The code is stored when your engine does not start or will only crank for an extended period without starting. Let us look at everything you need to know about this code.

What Could Be the Possible Causes of the P1604 TOYOTA Code?

If your car does not start, there could be multiple reasons which could help you understand how to fix the issue. Here are the possible causes.

Are You Using Low-Quality Fuel?

One of the reasons for startability malfunction is low-quality fuel. As much as the federal government does fuel quality inspections, these only happen occasionally. And since fuel is stored underground, rock sediments and water runoff can leak into the fuel containers, contaminating the fuel. If you happen to refuel at such a place, your car’s performance will decline.

Ignition relies on a steady flow of high-quality and clean fuel in the cylinder. Bad fuel quality is likely to prevent your car from starting. Aside from that, such fuel does not burn and combust properly. This reduces your engine’s overall performance and power, which can lead to startability issues.

Try refueling in a different place to see if your Toyota Camry will stop malfunctioning.

Your Battery Charge Might Be Low

Another possible cause for the P1604 code is a low battery charge. If the starter motor does not crank or cranks slowly, but the engine does not start, you may have a dead car battery. But if it cranks as usual and the engine still doesn’t start, your battery is good, but you have other problems such as a faulty spark plug or fuel issues. In other cases, your car will start, but instead of idling, the engine dies immediately. It means that the battery charge is too low.

When Is the Last Time You Replaced Your Fuel Filter?

One of the signs you need to replace your fuel filter is when your car will not start. Your engine needs fuel to start. But before the fuel is delivered to the cylinder, it passes through a fuel filter. As the name suggests, the filter’s job is to stop dust, dirt, and debris from getting into the cylinder. As such, you will need to replace the filter every 30,000 miles or two years.

If you have not changed your fuel filter as the car manual suggests and it is clogged, it will restrict fuel flow to your engine. This makes your car hard to start. And even before it gets to this point, your car will have exhibited certain symptoms like poor engine performance. If this has been happening, take your car to an auto shop for a fuel filter replacement.

The Engine Control Module (ECM) Is Bad or Failing

The ECM is also called the powertrain control module (PCM) or the engine control unit (ECU) and is a very important element in your Toyota Camry. It is like your car’s computer and plays a huge role in the engine’s performance and other drivability functions. That means when it is faulty, it affects other aspects of the car. This included preventing your car from starting.

A bad ECM can make it difficult to start the car or prevent it from starting completely. If it fails, it means your car is left without engine management control, meaning it will not start. The engine might crank, but it would not start. This is also another reason you may get the P1640 code.

When ECU is a problem, you have to go to the auto repair shop. Unlike changing the tire or oil, this is not something you can repair successfully. The ECU is an advanced piece of tech. It is just like repairing your computer. Let the professionals handle it for good results.

You Have a Faulty Supply Pump Assembly

Another possible cause for the P1640 code is a faulty fuel pump. Your fuel pump supplies gas to the engine. When you turn on the key, it activates the fuel pump. But when it is faulty, it will lead to performance issues, one of them being startability malfunctioning.

Your fuel pump is constantly running as long as the ignition is on. As such, it is bound to wear out or weaken. And even though a weak pump might still pump fuel, your car may have challenges starting because of the lack of pressure. You will find that it takes more cranks than usual for your car to start. In the worst-case scenario, you may have to turn the key multiple times before it starts. If your car starts exhibiting signs of a bad fuel pump, have it replaced. Fuel pumps should last up to 100,000 miles. That means that this problem is likely to be experienced in older cars.

Should I Be Worried About the P1604 Code?

If your car is having issues starting, then that is something to be worried about. Even if it is drivable, it means the car’s performance will be lower. Visit an auto repair shop for your vehicle to be fixed

Can I Fix Code P1604 Toyota Camry Code?

From the possible causes mentioned above, most likely, you can not DIY these repairs. Unless the issue is the car battery, in which case, driving will solve the issue. But when it comes to the other technical aspects like replacing the fuel pump or fixing the ECU, let a professional mechanic check it out. They will diagnose the issue and advise you on the steps to take.

How Much Does It Cost to Diagnose the P1604 Code?

This will depend on where you are and the mechanic you work with. Each mechanic has different rates. Once they find the possible reason for the P1604 Toyota Camry code, they will inform you of whether you need replacement parts or a repair job.

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