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P0735 – OBD-II DTC

OBD-II DTC P0735 – Gear 4 Incorrect ratio

DTC P0735 meaning

DTC P0735 refers to a diagnostic trouble code indicating that the transmission control module (TCM) has detected an incorrect gear ratio in the fourth gear of the automatic transmission. This code suggests that the actual gear ratio does not match the expected ratio, which can lead to performance issues and affect the vehicle’s drivability.

DTC P0735 symptoms

Common symptoms associated with DTC P0735 may include:

  • Slipping transmission
  • Delayed or harsh shifting
  • Check Engine Light illuminated
  • Reduced acceleration
  • Unusual engine RPM fluctuations

DTC P0735 causes

Several factors can contribute to the occurrence of DTC P0735, including:

  • Faulty transmission fluid level or quality
  • Worn or damaged transmission components
  • Malfunctioning TCM or transmission solenoids
  • Electrical issues such as short circuits or open circuits
  • Incorrectly calibrated transmission

DTC P0735 seriousness

DTC P0735 is considered a serious issue as it can lead to significant transmission problems. If left unaddressed, it may result in complete transmission failure, which can be costly to repair. Additionally, the symptoms can affect the vehicle’s safety and drivability, making it important to diagnose and resolve the issue promptly.

How to diagnose DTC P0735

To diagnose DTC P0735, follow these steps:

  1. Use an OBD-II scanner to confirm the presence of the P0735 code.
  2. Check for any additional trouble codes that may provide more context.
  3. Inspect the transmission fluid level and condition.
  4. Examine the wiring and connectors related to the TCM and transmission solenoids.
  5. Test the TCM and solenoids for proper operation.
  6. Perform a road test to observe the transmission behavior.

How to fix DTC P0735 step-by-step instructions

To fix DTC P0735, follow these steps:

  1. Check and top off the transmission fluid if low or replace it if contaminated.
  2. Inspect and repair any damaged wiring or connectors related to the transmission.
  3. Test and replace faulty transmission solenoids if necessary.
  4. Reprogram or replace the TCM if it is found to be malfunctioning.
  5. Ensure that the transmission is properly calibrated.
  6. Clear the DTC and perform a road test to verify that the issue is resolved.

How to erase DTC P0735

To erase DTC P0735, follow these steps:

  1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
  2. Access the trouble codes menu on the scanner.
  3. Select the option to clear or erase codes.
  4. Confirm the action and wait for the scanner to complete the process.
  5. Disconnect the scanner and perform a test drive to ensure the code does not return.

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