P0730 - OBD Trouble Code

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Error Code P0730 means the automatic transmission is experiencing a problem, which is usually caused by dirty transmission fluid or problems with shift solenoids. This code is a generic trouble code, meaning it applies to all vehicles equipped with the OBD-II system, especially those vehicles made since 1996 up to present. Specifications on the definition, troubleshooting, and repairs of course, vary from one make and/or model to another.

The PCM (powertrain control module, also known as ECM or engine control module in other vehicle makes), controls automatic transmission by using multiple gear ratio and increase the vehicle speed to maximize the engine’s power output. Newer vehicle models are equipped with more than four gear ratios for fuel efficiency. The PCM decides when to shift up or down between gears, based on the vehicle speed vs. throttle position. It does so by using the input coming from various sensors to verify the correct operation of the transmission and all its components.

The TCM (transmission control module) calculates gear ratio based on data from the transmission input shaft speed and output shaft speed sensors. The TCM compares the calculated gear ratio to the known gear ratio for each commanded gear. If the TCM detects an incorrect 1st gear ratio while decelerating in LOW, indicating no engine braking within the transmission, then DTC P0730 sets.

What causes this problem with the Incorrect Gear Ratio?

• Insufficient or dirty transmission fluid
• Clogged fluid filter or worn pump
• Solenoid, torque converter clutch or internal blockage
• Internal blockage in transmission main control
• Mechanical failure inside transmission
• Faulty shift wirings or solenoids
• Faulty transmission control module
• 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 P0730 can also be due to faulty ECMs. It’s better to get the faulty electrical replaced as soon as possible.
6. Powertrain Control Module - P0730 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 - In order to detect the error, one needs high grade diagnostic tools. 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 P0730 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 P0730.

• 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, shift solenoids, or torque converter

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Here are some steps which you should follow in order to diagnose this fault code:

• A suitable OBD-II scanner (or code reader) and a digital volt/ohmmeter will be most helpful in trying to perform a successful diagnosis.
• Begin with a visual inspection of all wiring and connectors. Repair or replace damaged, disconnected, shorted, or corroded wiring, connectors, and components as necessary.
• An experienced technician with a specialized scanner may determine the general area of the malfunction much more rapidly and easily than someone using a code reader and a digital volt ohmmeter.
• 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 P0730 Code

Some of the common mistakes done while changing diagnosing the OBD code P0730 are:

• Improper check for transmission fluid and solenoids
• Simply replacing the Powertrain Control Module (PCM) or Transmission Control Module without considering other possibilities of problem
• Not noticing the damaged or loosened wiring and circuit problems