how to fix the P0730 code on my Ram 1500 DT (2019-Present)

Learn how to diagnose and fix P0730 transmission gear ratio issue in Ram 1500 DT. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to avoid electrical shock.
• Ensure the vehicle is on a level surface and secure it with wheel chocks.

2. Check and Replace Transmission Fluid

• Tools Required: Socket set, transmission fluid pump, new transmission fluid.
• Remove the transmission fluid pan using a socket set.
• Inspect the old fluid for color and odor; if it is dark or smells burnt, it needs to be changed.
• Drain the fluid completely and replace the filter if applicable.
• Refill the transmission with the recommended type and amount of fluid using a transmission fluid pump.

3. Inspect and Replace Speed Sensors

• Tools Required: Multimeter, socket set.
• Locate the input and output speed sensors on the transmission.
• Disconnect the wiring harness from the sensors.
• Test the sensors with a multimeter; replace if readings are outside manufacturer specifications.
• Reinstall new sensors and reconnect the wiring harness.

4. Repair or Replace Wiring

• Tools Required: Wire connectors, electrical tape, multimeter.
• Inspect the transmission wiring harness for frayed or damaged wires.
• Repair any damaged wiring using wire connectors and electrical tape as necessary.
• Ensure all connections are secure and free of corrosion.

5. Reprogram Transmission Control Module (if applicable)

• Tools Required: OBD-II scanner with reprogramming capability.
• Use the OBD-II scanner to check if the TCM needs recalibration after repairs.
• Follow the scanner's instructions to reprogram the TCM if necessary.