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Car care tips & guides by our certified technicians
What Is ECU Programming? ECU Flashing Explained
ECU programming, also called flashing, loads software into a car's control module. Here is what that software contains, when a car needs programming, how it is done safely, and what it can and cannot fix.
How Many ECUs Does a Modern Car Have?
Modern cars carry anywhere from a couple of dozen to over a hundred electronic control modules. Here is what those modules do, how they are grouped, and what that means for repairs.
OBD vs Bench vs Boot ECU Programming: What's the Difference?
Most ECU programming happens through the OBD port, but some jobs need the module removed and programmed on the bench or in boot mode. Here is how the three methods differ and when each is used.
J2534 Pass-Thru and Online OEM ECU Programming Explained
Many modern programming jobs use the manufacturer's own software, often through a J2534 pass-thru interface and an online connection. Here is how that works and why it is required.
What Information Is Needed Before ECU Programming?
Programming quotes depend on details. Here is the vehicle and module information to have ready, the documents security procedures need, and what affects how long ECU programming takes.
Why a Replacement Module Doesn't Work Straight Away
A new control module often won't work the moment it is plugged in. Here is why: the six things a replacement may need before it works, and how to avoid buying the wrong part.
BCM Coding and Programming: What Happens When a BCM Is Replaced
The body control module runs many everyday functions, from lights and locks to wipers and power management. Here is what it does, how BCM faults are diagnosed, and what a replacement BCM needs.
TCM Programming and Transmission Adaptation After Gearbox Repair
Automatic gearboxes learn how their clutches and shifts behave. After gearbox repair, a fluid service or a TCM replacement, that learning often has to be reset. Here is what TCM programming and adaptation involve.
U-Codes Explained: What Network Communication Fault Codes Mean
Scan results full of U-codes can look alarming. Here is how network communication codes are structured, what common ones mean, and how to read them without replacing the wrong module.
Why Several Warning Lights Come On at the Same Time
When several warning lights appear at once, it is rarely several separate faults. Here are the common shared causes and how a proper diagnosis narrows them down.