P0735 Incorrect gear ratio 5

P0735 – OBD-II Trouble Code Technical Description

Incorrect 5th gear ratio

What does the fault code mean P0735?

P0735 – No signal from the engine speed sensor (transmission input speed sensor). This code may appear on vehicles with automatic transmission when there is a problem shifting into 5th gear or when driving in 5th gear. The computer-controlled automatic transmission uses multiple ratios to increase vehicle speed while maximizing engine power output. New cars can have more than four gear ratios to improve fuel economy. The computer determines when to shift up or down depending on the throttle position and vehicle speed.

When the P0735 code occurs, you should pay attention to the following:

• The P0735 code may appear on vehicles with an automatic transmission when there is trouble shifting into 5th gear or when driving in 5th gear.
• Automatic transmissions are controlled by the vehicle's computer and use different gear ratios to achieve optimal performance and fuel economy.
• Code P0735 is related to the engine speed calculation from the transmission speed sensor. If the calculated value is not what is expected, this code occurs.
• Similar codes include P0730, P0731, P0732, P0733, P0734 and P0736. It is recommended that you resolve these issues before resolving the P0735 code.

Possible reasons

A number of common reasons that can lead to calculation inconsistencies and therefore a P0735 code include:

• Insufficient level or contamination of transmission fluid.
• Mechanical faults in the gearbox.
• Internal interlock in the main part of the transmission control.
• Defective shift solenoids.
• Transmission control module malfunction.

What are the symptoms of a fault code? P0735?

Symptoms associated with a P0735 code may include:

• The “Check Engine” light (malfunction indicator light) comes on.
• Delay in shifting gears or inability to shift to 5th gear.
• Slippage of the gearbox.
• Loss of fuel economy.

These symptoms indicate a problem with the components responsible for automatic transmission shifting and may be related to the P0735 code.

How to diagnose a fault code P0735?

Before you begin diagnosing the P0735 code, you must complete the following steps:

1. Check for other fault codes and resolve them first.
2. Check the level and condition of the transmission fluid. Incorrect levels or dirty fluid can cause shifting problems.
3. Test drive the vehicle to determine if the transmission operates correctly.
4. Check the operation of the shift solenoids and the electrical components that control them.
5. Check for blocked fluid passages inside the transmission, which could cause mechanical problems.

If you have multiple P0735 codes and shifting problems, look for mechanical problems with the torque converter, main transmission control, or fluid pressure. If transmission problems are related to the shift solenoid, then electrical problems must be repaired. In-depth knowledge of transmissions and the use of an advanced diagnostic scanner may be required for more complex diagnostic procedures.

Diagnostic errors

In most cases, the root cause of the P0735 code is internal transmission problems, which is why mechanics should first pay attention to the condition of the transmission before attempting to replace the solenoid. In the past, some mechanics missed this important point and replaced components unnecessarily.

How serious is the fault code? P0735?

Trouble code P0735 is serious because it indicates shifting problems in the automatic transmission. This can result in poor fuel economy, poor performance, and increased wear on transmission components. It is important to take this code into account and carry out diagnostics and repairs to avoid further damage and ensure that your vehicle operates reliably.

What repair will help eliminate the code? P0735?

To resolve code P0735, the first step is to check the condition of the transmission fluid and pressure level. If the fluid is severely worn, it is necessary to remove the drive plate and check for signs of wear on the clutch material and other debris. It is also important to inspect and, if necessary, replace the circuit boards and connectors in the transmission. These steps can help restore reliable operation of your transmission and resolve the P0735 code.

What is P0735 Engine Code [Quick Guide]

P0735 – Brand-specific information

The P0735 code is related to problems with the automatic transmission and can be common to different makes of vehicles. Deciphering and repairing this code varies depending on the specific make and model of the vehicle. Below is a list of some famous car brands:

1. BMW – Code P0735 indicates problems with the “5” gear.
2. Ford - This code may indicate that the 5th gear is not working properly.
3. Toyota – P0735 can be related to fifth gear problems or transmission problems.
4. Honda – For Honda, this code may indicate errors when operating in fifth gear.
5. Chevrolet - In Chevrolet vehicles, the P0735 code may indicate a malfunction in the 5th gear of the automatic transmission.

For accurate information and repairs, it is always recommended to contact specialists for a specific car brand.