Fault guides
Plain-English guides to common module faults and fault codes — what they mean, what to check first, and when a board repair or a clone is the answer.
P0606, P0605 and other ECU internal fault codes (P0600–P0606)
What P0606, P0605 and P0601 mean, common causes, what to check before replacing the ECU, and when a repair or clone is the answer.
U0100: lost communication with the ECM/PCM
U0100 means other modules can't hear the engine ECU on the CAN bus. Common causes, checks to do first, and when the ECU needs repair or cloning.
Peugeot, Citroën and DS BSI failure: symptoms and fixes
Common Peugeot/Citroën BSI faults — locking, wipers, lights, no start — what to check, and when a BSI repair or clone is needed.
Water-damaged BCM, BSI or SAM: what to do
Body control modules are often mounted where water gets in. What to do after water damage, what can be repaired, and when the data can be moved to a donor.
Ford PATS immobiliser: no start after changing a module
Why a Ford won't start after fitting a used BCM, ECU or cluster, what P1260 means, and how transferring the original data fixes it.
BMW CAS or EWS fault: key not recognised, no start
BMW CAS1/2/3 and EWS immobiliser faults explained: symptoms, checks, and how a like-for-like data transfer to a matching unit works.
BMW and MINI FRM3 footwell module dead after a battery change
Why the BMW/MINI FRM3 footwell module stops controlling the lights and windows after a flat battery or jump start, and how it's repaired or cloned.
Airbag light on after an accident: crash data explained
Why many airbag modules lock after a crash, what crash data is, and how bench crash data reset works for supported non-German makes.
Fitting a second-hand ECU, TCU or module: why it needs cloning
A used ECU or module from another car usually won't work in yours. Why, and how cloning (data transfer) makes it plug and play in most cases.