How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask vipertech763 Your Own Question
vipertech763, automotive technician
Category: Dodge
Satisfied Customers: 1854
Experience:  gold certified, dodge viper certified
Type Your Dodge Question Here...
vipertech763 is online now
A new question is answered every 9 seconds

2001 dodge caravan: transmision module..trans..speedometer..PINION

Resolved Question:

2001 dodge caravan transmision module.(changing the trans. module)what does this means speedometer will not work until PINION FACTOR is set
Submitted: 9 years ago.
Category: Dodge
Expert:  vipertech763 replied 9 years ago.

Good evening, what this is is that the tire size needs to be entered into the trans control module. This way it can calculate the speedometer correctly. Here is what the manufacture says about it:


NOTE: This procedure must be performed if the Transmission Control Module (TCM) has been replaced with a NEW or replacement unit. Failure to perform this procedure will result in an inoperative or improperly calibrated speedometer.

The vehicle speed readings for the speedometer are taken from the output speed sensor. The TCM must be calibrated to the different combinations of equipment (final drive and tires) available. Pinion Factor allows the technician to set the Transmission Control Module initial setting so that the speedometer readings will be correct. To properly read and/or reset the Pinion Factor, it is necessary to use a DRBIII® scan tool.

  1. Plug the DRBIII® scan tool into the diagnostic connector located under the instrument panel.
  2. Select the Transmission menu.
  3. Select the Miscellaneous menu.
  4. Select Pinion Factor. Then follow the instructions on the DRBIII® scan tool screen.

Inorder to perform this, you will have to go to the dealer and have then perform this using the factory scanner. Let me know if I can help you further or if you need more help.

vipertech763 and 6 other Dodge Specialists are ready to help you

Related Dodge Questions