Error Code P0735: What It Means & What To Do?

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A decrease in the fuel consumption and the engine performance along with occasional engine stalling and not starting with improper throttle response may be an indication of problem with the transmission system hampering the engine’s performance, thus indicating OBD Code P0735.

OBD-II Code P0735 is defined as a Gear 5 Incorrect Ratio.

OBD code P0735 utilizes calculations based upon throttle position, engine load, engine speed, and vehicle speed to determine the desired gear ratio. If the desired gear ratio fails to coincide with the actual gear ratio detected, a code will be stored and a malfunction indicator lamp may be illuminated. Some applications require multiple failure cycles in order for a service engine soon lamp to be illuminated.

P0735 can be triggered when your vehicle is driving in 5th gear or while you’re shifting into it. With an automatic transmission, the vehicle’s computer is in charge of the shifting. Part of the process involved is calculating engine speed against the transmission speed sensor to assess the torque converter slip and gear ratio.

What causes this problem with the Gear 5 Incorrect ratio?

• Transmission fluid dirty or insufficient levels
• Transmission failure
• Fluid filter clogged or worn out pump
• Transmission main control internal blockage
• Solenoid, torque converter clutch or internal blockage
• Shift wirings or solenoids failure
• Transmission control module failure
• Defective torque converter clutch

1. Automatic Transmission Solenoid - Faulty solenoids can affect the performance of transmission control system and should be replaced immediately. Buy new solenoids and replace the faulty one now!
2. Transmission Control Module - The TCM can also be faulty, causing problems with the transmission and gear ratios. Replace faulty module today.
3. Automatic Transmission Sensor - It can be a case that the transmission sensor is unable to detect the engine speed and throttle response properly in order to select the correct gear transmissions. Buy new sensor now!
4. Auto Transmission Torque Converter - Defective torque converter will affect the transmission system and thus the overall performance of the vehicle. Buy new torque converter today!
5. Engine Control Module - OBD Error Code P0735 can also be due to faulty ECMs. Replace faulty ECM components with us.
6. Powertrain Control Module - P0735 error code also relates to problems with the powertrain that is not able to generate response in time causing distorted engine timing. Find all the Powertrain related parts with us.
7. Diagnostic Tool - Always use professional diagnostic tools to detect the problems in relation the specific OBD code. Visit us today to grab amazing deals.

It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0735 here:

Common Symptoms

• Delayed shifting or vehicle not shifting into the right gear
• Transmission slipping
• Decrease in fuel efficiency
• Check Engine Light illumination

Here are some ways with the help of which you will be able to correct the OBD Code P0735.

• Repair or replace any corroded or damaged wires in and around the transmission control module
• Replace transmission fluid and wiring, if not in working condition
• Repair or replace problem with the pump
• Replace faulty shift solenoids
• Replace faulty torque converter

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• Begin with a visual inspection of all wiring and connectors. Repair or replace damaged, disconnected, shorted, or corroded wiring, connectors, and components as necessary.
• Retest the system after repairs are completed to ensure success. If all system wiring, connectors, and components appear to be in normal working order, connect the scanner (or code reader) to the diagnostic connector and record all stored codes and freeze frame data.
• Check the fluid in the transmission should be checked for quality, and the level of fluid prior to further diagnostic tests. Replace old or dirty fluid as required.
• Perform a torque converter stall speed test to determine if the engine stall speed is within factory specifications. The engine speed must match the readings from the transmission sensor.
• Faulty TCM (Transmission Control Module) and PCM should also be repaired, reprogrammed or replaced as required.

Common Mistakes When Diagnosing the P0735 Code

Some of the common mistakes done while changing diagnosing the OBD code P0735 are:

• Directly replacing the TCM without evaluation
• Simply replacing the Powertrain Control Module (PCM) without considering other possibilities of problem
• Not checking the damaged or loosened wiring and circuit problems