Rick's Free Auto Repair Advice

Fix a Jeep U0404 code

Fix a Jeep U0404 code by cleaning the shifter mechanism and testing the electronic shift module

A Jeep U0404 code is quite common. It’s defined as Implausible Data Receiver from ESM. The electronic shift module (ESM) is located in the console and connects to the shifter mechanism. It reports a digital signal to the transmission control module to tell it which gear you’ve chosen.

What causes the Jeep U0404 code and ESM failure

Because the ESM sits next to the shifter, it collects debris electronic shift module ESM can cause a Jeep U0404like hair, coffee, soda, dust and dirt. Before replacing the module, try removing it to clean it. Use contact cleaner and a pencil eraser to remove all corrosion from the contact terminals.

Next, remove the case of the ESM and check for the presence of soda, coffee, etc. Clean off all traces of debris. With ESM disconnected from power, use a household cleaner (not a solvent based cleaner) to remove spilled drink residue. They dry fully with a can of compressed air before reconnecting. Then reassemble, clear the codes and see if they return.

If you can’t clean the ESM, purchase a refurbished unit. The cost less than $200.

Diagnose the ESM

Connect your scan tool and find which gear the ESM is reporting to the transmission control (TCC). Move the shifter and watch your scan tool to make sure the gear results match what you’ve selected. If there’s a mismatch, the problem is in the ESM.

IF you don’t have a scan tool, you’ll have to assume the problem is with the ESM and either replace it or try to clean the terminals.

©. 2019 Rick Muscoplat

Posted on by Rick Muscoplat

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