What Does P0770 Toyota Corolla 2003 Mean?

If you own a 9th generation Toyota Corolla and find the code P0770, you should find out the causes and the ways to handle it. Why is there the P0770 Toyota Corolla 2003? How to fix it? Keeping scrolling for more information.

Shift solenoid E Toyota Corolla 2003

Shift solenoid E Toyota Corolla 2003 – Image source: Wap Car

What Is The P0770 Toyota Corolla 2003?

The P0770 is a trouble code related to a car’s automatic gearbox and the shift solenoid that manages the lockup system of the torque converter. It’s a sign of faulty solenoid E on the transmission system.

P0770 Toyota Corolla 2003

What Does P0770 Mean?

Similar to the P1135 and P1155 on Toyota Avalon, P0770 is a common OBD-II (On-Board Diagnostics, Second Generation) code. But it indicates that the shifting solenoid E on the gearbox is not functioning properly. 

It regulates the hydraulic pressure delivery towards the lockup mechanism of the torque converter, which establishes the balance for the output and input data transmission rates. 

To improve highway fuel efficiency, lockup often occurs during driving speed. It also appears when the torque converter doesn’t slide. 

What Causes The P0770 Code?

There are many causes for the code P0770, the most typical being the malfunction when shifting the solenoid circuit E. In addition, improper connections for the transmission solenoid lead to this problem. Inadequate, leaking or soiled transmission fluid are the potential culprits.

Torque converter and transmission damages due to collisions while performing also trigger this error. Besides, the lack of regular vehicle maintenance is another reason why the P0770 shift solenoid “e” location appears.

What Are The Symptoms Of P0770?

The torque converter refuses to lock up, reduced fuel efficiency, and the engine operating at high horsepower is the most typical P0770 sign. The transmission can shift abruptly or stall the motor when the car is idling. 

Another symptom is the check engine light will be shown on the dashboard.

How To Diagnose The P0770 Code?

First, take the car for a road test to determine the severity of the symptoms because a P0770 is connected to a car’s speed. The code P0770 can represent an inconsistent problem if the vehicle seems to be functioning normally. 

To ensure that the gearbox doesn’t lock up the torque converter, check the motor speed, highway speed, and throttle valve place if it doesn’t lock up.

Besides, you should check the solenoid E signal to ensure it is working properly by utilizing an expert OBD-II scanner (check the owner’s manual to decipher the code). In such a case, a new solenoid should be installed. 

Yet, suppose the torque converter has a technical issue and the solenoid is providing the wrong signal range based on the throttle position. Then, you should choose the right torque converter and replace the bad one.

The fluid should be examined for low or filthy levels, just like most transmission fault codes. When it runs low or dirty, top it off or replace it completely.

Common Mistakes When Diagnosing The P0770 Code

It is typical to suppose that a solenoid has broken. However, in fact, wiring problems or improper testing of the solenoid are the roots of the problem. A blocked internal route brought on by dirty transmission fluid might also give you the impression that the shift solenoid has been damaged. 

A broken antifreeze sensor is often the biggest error. The list also includes malfunctioning faulty valve bodies and a cracked torque converter gear.

How To Fix The P0770 Code?

It will be best to read the Technical Service Bulletins (TSBs) first to know the model and parts of your car. It will help you identify the problem more accurately and make the right troubleshooting.

It can properly guideyou and ultimately save you a lot of time in certain cases. If feasible, you should also examine the car documents to find out when the filter and fluid should be changed and take note of the last replacement time.

Fluid & Wiring System Check

First, you should ensure that the fluid level is accurate and check the liquid for contaminants. We suggest you inspect the wires thoroughly to look for any visible flaws like scratching, rubbing, exposed wires, or burn marks. 

Next, the links and cables should be examined for rust and broken pins. In this step, you can examine the wires and lines connecting the gearbox pump, solenoids, and PCM (powertrain control module).

Depending on the setup, the transmission connection also needs to be checked for binding and security reasons.

Continuity Checks 

A digital multimeter and the relevant car specification manuals are necessary for this process. Based on the year and type of car, they can provide different voltages.

You must always turn off the electricity while conducting this process for safety. Besides, the usual readings for normal wiring and connectors should be zero ohms. Tension or a lack of continuity are signs of bad wires that must be fixed or changed because they are exposed or shorted.

Repairing Steps

There are 4 basic steps to repair the P0770 code:

Step 1: Locate the 2003 Toyota Corolla shift solenoid E location, then change the shift solenoid E by disconnecting the negative battery cable, raising the car, and removing the transmission fluid.

Step 2: Fix the broken wires, then change the torque converter.

Step 3: Flush and refill the transmission fluid

If you are not an expert in the automobile industry, you can find the solution from the experts or skilled mechanics, as this is overly technical. They have great expertise in fixing this code problem and can give you some advice and guidance.


What Is The Cost Of Diagnosing The P0770 Code?

Typically, it will cost you about $115 to diagnose the problem and an additional $20 to repair code P0770. The labor expense will be calculated within one hour of diagnosis.

The necessary information about the problem and the solution will be clearly provided to the drivers. The mechanics will also instruct you on vehicle maintenance times and other things to keep in mind.

Is The P0770 Code Dangerous While Driving?


It can be dangerous because it will entail more serious effects. Your gearbox may be in danger of overheating with this code since the majority of P0770s will affect the way that the torque converter operates. 

Get this checked out as soon as you can, and if you need to travel with the P0770 code, try to limit your time on the freeway.

What Is The P0770 Toyota Tacoma?

Similar to the 9th gen or 12th gen Toyota Corolla, the Tacoma’s P0770 code is a warning that the Lockup Converter Solenoid is malfunctioning.

The Powertrain Control Module (PCM) detects a disparity in the engine speed of the torque converter and the input gear since you are getting the P0770 code. When there is a 200 rpm discrepancy between the values, the P0770 error message emerges.

The causes and solutions to this problem are similar to the ones in the Corolla 2003.

What Is The P0741 Toyota Corolla?

If there is a mismatch of more than 200 revolutions per minute between the torque converter’s speed and the gearbox’s input shaft, the Corolla’s Powertrain Control Module will display the P0741 error code. Any Toyota car model built after 1996 must comply with this requirement.

There are two explanations behind its appearance as follows:

  • All clutch is wearing out, affecting the performance of the car
  • The Corolla’s wiring system has a fault that prevents the TCC (Torque Converter Clutch) from activating. It’s a serious problem related to the stuck-off.

A few ways to fix this problem are preventing the torque converter lockup and checking the wiring system or the valve body. You can also inspect the transmission control unit and the engine coolant temperature sensor. If necessary, you can replace these parts when they fail.


What does P0770 Toyota Corolla 2003 indicate? It is a trouble code that relates to the solenoid E malfunction in the car’s gearbox and the shift solenoid that controls the lockup system of the torque converter. We hope you found this article useful in fixing this error code. See you in the next posts.

Leave a Comment