P0773 Electrical fault in the shift solenoid valve "E" circuit

P0773 – OBD-II Trouble Code Technical Description

Trouble code P0773 is a general trouble code that indicates there is a problem with the shift solenoid valve “E”.

What does the fault code mean P0773?

Trouble code P0773 indicates a problem with the shift solenoid valve “E” in the automatic transmission. This valve is responsible for changing the gear ratio depending on the driving conditions of the vehicle. This code may indicate a malfunction or damage to the valve itself or the wiring that controls it.

Possible reasons

Some possible reasons for the P0773 trouble code:

• Shift solenoid valve “E” is faulty.
• Damage to the wiring connecting the “E” valve to the transmission control module (TCM).
• Problems with the transmission control module (TCM) itself, including software errors or malfunctions.
• Insufficient level or poor quality gear oil.
• Mechanical problems in the transmission, such as worn or damaged gearshift mechanisms.
• Incorrect operation of the speed sensors or throttle position sensor, which may result in incorrect gear shifting.
• Electrical noise or short circuit in the circuit that controls valve “E”.

To accurately determine the cause, it is necessary to diagnose the transmission using specialized tools and equipment.

What are the symptoms of a fault code? P0773?

Some possible symptoms for trouble code P0773:

• Rough or jerky shifting: This can manifest itself as the vehicle shifting into the next gear too early or too late, creating jerky or uneven acceleration.
• Shifting Problems: The vehicle may have difficulty shifting gears or may not shift into the correct gears at all.
• Increased fuel consumption: Incorrect gear shifting can result in increased fuel consumption due to insufficient engine efficiency.
• Transmission Emergency Mode: Some vehicles can enter a transmission emergency mode in which they limit speed and functionality to protect against further damage.
• Check Engine Light Appears: When trouble code P0773 appears, the vehicle may activate the Check Engine Light on the dashboard.

It is important to note that symptoms may vary depending on the specific model and condition of the vehicle.

How to diagnose a fault code P0773?

Diagnosing the P0773 trouble code typically involves the following steps:

1. Checking Error Codes: First you need to connect your OBD-II car scanner to check for other error codes in the system. This will help determine if there are other problems that may be related to the transmission or other vehicle systems.
2. Checking the transmission fluid level: Incorrect transmission fluid level or condition may be causing a solenoid valve problem. It is necessary to check the level and condition of the transmission fluid according to the manufacturer's recommendations.
3. Checking electrical connections: To identify problems with the solenoid valve and its control circuit, check the electrical connections, wires, and connectors for corrosion, damage, or breaks.
4. Solenoid Valve Testing: Using special equipment or a multimeter, you can check the functionality of the solenoid valve, as well as its resistance and electrical characteristics.
5. Checking Mechanical Components: Sometimes gear shifting problems can be caused by mechanical problems in the transmission. Check the condition of transmission mechanical components such as solenoids and valves.
6. Additional tests: Depending on the specific circumstances, additional tests may be required, such as checking the transmission hydraulic pressure or testing other components.

It is important to perform diagnostics according to the vehicle manufacturer's recommendations and use the correct equipment to detect and correct the problem. If you are unsure of your skills or experience, it is best to contact a qualified auto mechanic.

Diagnostic errors

When diagnosing DTC P0773, the following errors may occur:

1. Incorrect interpretation of scanner data: Sometimes the data provided by the scanner can be misinterpreted or read incorrectly, which can lead to an incorrect diagnosis.
2. Insufficient attention to other error codes: Sometimes the problem can be caused not only by the P0773 code, but also by other error codes that also need to be taken into account when diagnosing.
3. Incorrect interpretation of testing data: When performing performance tests on a solenoid valve or other transmission components, errors may occur in interpreting the test results.
4. Insufficient checking of electrical connections: Incorrect diagnosis may occur due to incorrect inspection of electrical connections, wires or connectors, which may result in the problem being incorrectly identified.
5. Failure to follow manufacturer's recommendations: Incorrect diagnostic performance that does not comply with the vehicle manufacturer's recommendations may lead to errors and incorrect identification of the cause of the malfunction.

To avoid these errors, it is important to follow the manufacturer's instructions, correctly interpret the data received from the scanner, and pay attention to all available error codes and diagnostic guidelines.

How serious is the fault code? P0773?

Trouble code P0773, which indicates a problem with the shift solenoid valve “E”, can be serious because it can cause the vehicle's transmission to not operate properly. If the valve does not function properly, it may result in incorrect gear shifting, which may affect performance and riding safety. If this code appears, it is recommended that you immediately contact a qualified auto mechanic to diagnose and repair the problem.

What repair will help eliminate the code? P0773?

Troubleshooting a P0773 code may include the following steps:

1. System diagnostics: The shift system must first be diagnosed, including checking the “E” solenoid valve, connecting wires and other shift related components.
2. Electrical circuit check: Check the electrical circuit, including wires and connectors associated with solenoid valve “E,” for damage, corrosion, or breaks. Replace or repair damaged components as necessary.
3. Checking the Shift Valve: Check the condition and functionality of the solenoid valve “E”. If the valve is damaged or defective, replace it with a new one.
4. Software update or setup: Sometimes the problem can be solved by a software update or adjustment of the transmission control module (TCM). This may be required for correct operation of the solenoid valve and gear shifting.
5. Checking and replacing other components: In some cases, the problem may be related to other components of the transmission, such as speed sensors or pressure sensors. Check their condition and replace if necessary.
6. Rigorous testing: After repairs are completed, thoroughly test the transmission to ensure that the problem is resolved and the error code no longer appears.

In case of difficulties or lack of experience, it is recommended to contact a professional auto mechanic to perform repair work.

How to Diagnose and Fix P0773 Engine Code - OBD II Trouble Code Explain

P0773 – Brand-specific information

Trouble code P0773 relates to the vehicle's shift system. This code can be deciphered differently in different brands of cars; there are several decodings for different brands:

• Toyota/Lexus: Malfunction of solenoid valve E in the transmission valve body.
• Ford: Valve block control solenoid valve E error.
• Nissan/Infiniti: Malfunction of the valve body control solenoid valve E.
• Chevrolet/GMC: Inconsistency in the operation of the electromagnetic valve E of the valve body.
• Honda / Acura: Faulty transmission valve control solenoid valve E.
• BMW / Mini: Error in transmission valve control solenoid valve E.
• Volkswagen/Audi: Malfunction of the hydraulic unit control solenoid valve E.
• Mercedes-Benz: Solenoid valve E performance mismatch.
• Hyundai / Kia: Solenoid valve E operation inappropriate.

These are just some examples of P0773 code decodings for various car brands. The exact value may vary depending on the model and year of the vehicle. It is recommended that you consult your service manual or vehicle service technician for accurate information.