Nope, you don't need the PCM for the new engine, just make sure to transfer over all sensors and brackets that are needed for the installation. The P0885 code for a 2005 Hyundai Elantra refers to a TCM Power Relay Control Circuit Open so I would check the TCM fuses and grounds. Here is a guide to help you and the TCM location so you can swap it out if the power and grounds are good.
https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester
Here are the TCM wiring diagrams so you can see which fuses to check and the ground circuits as well. Check out the images (below). Please let us know what happens.
Images (Click to make bigger)
SPONSORED LINKS
Monday, September 16th, 2024 AT 5:58 PM