The Engine Clean standard: prove whether the fault is inside the unit, then choose the most sensible technical route.
Do not keep powering wet electronics
Moisture, contamination and electrical power accelerate corrosion and can create further damage. If water ingress is suspected, avoid repeated starting attempts or improvised drying and arrange proper inspection.
Inspect beyond the ECU case
Connector seals, loom condition, terminal tension, drainage paths and signs of previous disturbance matter. The ECU pins and both sides of the case should be photographed where possible. Vehicle-side repairs may be essential before another unit is connected.
Repair, donor and data options
The correct route depends on what has corroded and whether the original data remains accessible. It may involve PCB or connection repair, loom repinning, new seals, a tested donor and either cloning or programming as a replacement unit.
A repair cannot warranty a repeated soaking
Engine Clean warrants its work under the applicable terms, but misuse and new water damage are excluded. Pressure-washing an ECU or its connectors can defeat seals and recreate the same failure. The repair and the cause must both be respected.
Straight answers
Before ECU or module work
Can a water-damaged ECU be repaired?
Sometimes. Repairability depends on corrosion, PCB damage, connector condition, data access and whether the source of water ingress is corrected.
Should an engine bay ECU be pressure-washed?
No. Direct pressure washing can force water into connectors or damaged sealing areas and may cause corrosion or electrical failure.
Is repeat water damage covered by warranty?
No. New water ingress, pressure-washing damage and other misuse are outside the repair warranty. The specific terms depend on the parts and work supplied.