C1201 Toyota Code Meanings, Causes, and Symptoms. (& How to Fix).

While some trouble codes tell you what’s wrong across all brands, there are a few that are automaker specific. The C1201 Toyota code is one example. This trouble code is what it means and should be addressed.

We will be discussing the C1201 diagnosis code for Toyota vehicles in this article. The symptoms and causes of the C1201 diagnostic code on Toyota vehicles are also discussed. 

Definition of Code

C1201 – Engine Control System Malfunction

What is the C1201 Code?

The C1201 trouble code is a generic Toyota code that doesn’t reveal a whole lot of other information. It’s used in conjunction with other codes to determine what’s wrong with the vehicle. It can be related to fuel, anti-lock brake systems, or emissions depending on other codes. 

For this reason, if you get a C1201 code, it’s important to perform a full scan of the system to get a better idea of what’s happening. It is important to look for other trouble codes related to this code. This will likely solve the engine code. These codes will help you to be more informed about the next steps.

C1201 Trouble Code Symptoms

Because the C1201 trouble code could mean just about anything, this DTC isn’t going to lead to the symptoms that your vehicle is experiencing. The Check Engine Light is all that this code can produce. Any symptoms you see are not due to this code.

One example is:

The C1201 Code: Causes

When the engine control systems malfunctions, C1201 codes are set. Because this can be caused by any defective sensor, system or wiring issue, it’s hard to determine what the cause is without looking at the other trouble codes.

However, these could also be causes:

Is the C1201 Code Seriose?

Medium – It depends on what else is going on with the vehicle. For example, if the problem stems from a broken gas tank cap, you aren’t looking at anything serious. The car should continue running, but there may be performance issues. 

On the other hand, if there’s a faulty wire or sensor, there’s always the possibility that the car will leave you stranded. That’s why you should always have the codes looked at as soon as the Check Engine Light comes on. 

How can you fix the C1201 code?

Before you can find the right fix, it is necessary to perform a complete diagnostic. Here are some tips to help get you started. 

Here are some ideas. 

• Replace gas tank cap
• Replace oxygen sensor
• Repair EVAP system leak
• Restore damaged wiring

Common errors in diagnosing C1201

It is a common mistake to not look at all codes when you work with C1201 code trouble. This DTC alone won’t tell you what’s wrong. It is important to examine the other factors that are related to this DTC to find out what causes it. 

The following codes may also be used in conjunction with this code:

Diagnostic Tools

How do you diagnose the C1201 trouble code?

You should use the same diagnostic steps to diagnose C1201 as professional mechanics. You will be directed to the correct system by the diagnostics, which is a generic code. 

Below are some guidelines:

1. Make sure to clear the trouble codes.
2. Test drive the vehicle until it comes on again.
3. Check for new codes and compare them to C1201. 
4. To evaluate any other codes, follow the steps below. They will help you identify the problem.
5. After the problem is fixed, you can clear all codes and go for a drive. 

Here are some mechanics tips about the C1201 Code

Just because the Anti-Lock Brake System or Traction Control Light is on, don’t just assume that the fault has something to do with these problems. As part of the failsafe, the Control Area Network(CAN) will shut down operations of VSC or TRAC when the engine control fails to function normally.

These systems may appear to be operating as normal, even though they are not. Stay focused on the trouble codes that aren’t generic instead.

Calculated Cost for Repair

You can expect to pay varying amounts depending on how your car is being fixed. These are some of the costs you may be facing and an estimate.

• New gas tank cap – $5-$25
• New oxygen sensor – $150-$550
• Repair EVAP system leak – $100-$650
• Repair damaged wiring or harness – $50-$1,500

Most Frequently Asked Questions