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Car care tips & guides by our certified technicians
ABS / ESC Module Replacement, Coding and Calibration
The ABS/ESC module keeps wheels from locking and the car stable. Here is how ABS faults are diagnosed, and the coding, calibration and bleeding a replacement unit usually needs.
Airbag (SRS) Module Replacement After a Crash: What to Know
After airbags deploy, the airbag control module usually stores crash data and needs attention. Here is what the SRS module does, what manufacturers typically require, and why this is a job to do by the book.
Battery Registration: Why Some Cars Need It After a New Battery
On cars with intelligent battery management, a new battery has to be registered so the charging system treats it correctly. Here is what registration does and which cars typically need it.
Car Cranks but Won't Start After a Module Replacement
A car that cranks but won't start after a module was replaced usually hasn't completed its security matching. Here is why, what else can cause it, and how it is resolved properly.
What Is an Immobilizer, and Why Does a Replacement ECU Need Matching?
The immobilizer only lets the engine run with an authorised key. Here is how it works, which modules are involved, and why replacement modules and keys must be matched through authorised procedures.
KESSY and PEPS Keyless Entry Systems Explained
Keyless entry and push-button start systems, known as KESSY in VW-group cars and PEPS generally, detect your key as you approach. Here is how they work, what goes wrong, and what repairs involve.
EV Control Modules Explained: BMS, VCU, Inverter, OBC and DC/DC
Electric cars add a set of high-voltage control modules. Here is what each one does — the BMS, VCU, inverter, on-board charger and DC/DC converter — and how they work together.
EV and Hybrid Fault Diagnostics: What Owners Should Know
Electric and hybrid cars have their own set of faults, from charging issues to high-voltage warnings, and a surprising number start with the 12-volt battery. Here is what owners should know.
What Does an EV Battery Management System (BMS) Do?
The battery management system is the EV module that protects the most expensive part of the car. Here is what it monitors, how balancing works, and what BMS diagnostics can tell you.
BMW Coding and Programming: What Owners Should Know
BMWs are built around a digital record of how each car was equipped, which makes coding central to many repairs. Here is what owners should know about coding, programming and battery registration.