P0685 Code Meaning
A P0685 code means the ECM or PCM power relay control circuit has a fault, often from the ASD or main relay, a fuse, wiring, or the module itself.
Scan Tool No Communication
When a scan tool has no communication with the ECU, check DLC power, CAN wiring, and ignition first. That blank screen is not the same as a U0100 code.
P0606 Code Meaning
A P0606 code points to a PCM or ECM processor fault, but low voltage, bad grounds, and a failed flash can look just like a bad module before you replace it.
6 Reasons for No Injector Pulse While Cranking
If you’re getting no injector pulse while cranking, the cause ranges from a simple sensor issue to a failing ECU you might not suspect.
How to Fix a P0700 Code
A P0700 code alone won’t tell you what’s wrong, and fixing it means tracking down the specific fault stored in your TCM.
What Does the U0100 Code Mean?
The U0100 code shows up when your car’s modules stop talking to each other, and the fix depends on finding out why.
How Automotive ECU Testing Saves You Money
Wondering what automotive ECU testing actually checks? See what it can rule out before you pay for a replacement module you may not need.
5 Reasons Your Car Is Stuck in Limp Mode (2026 Guide)
A car stuck in limp mode usually points to low transmission fluid, a bad sensor, overheating, wiring damage, or a failing ECU or PCM. Here’s how to tell.
How to Reset a Jeep ECU Safely
Knowing how to reset a Jeep ECU can clear minor issues fast, but it won’t fix a module that has truly failed.
6 Things to Know About a TIPM Module
A TIPM module controls key electrical functions in many Dodge, Jeep, and Chrysler vehicles, and knowing how it fails can save you time.