Send-in ECU / ECM repair for mechanics, auto electricians, workshops, fleet operators and vehicle owners across New Zealand.
DRG Auto focuses on the engine computer itself: board inspection, power and communication faults, corrosion, damaged tracks, failed components and practical repair assessment. If the vehicle-side diagnosis points toward the ECU, send the module to us for bench assessment.
ECU / ECM Repair - No Communication Faults - No Start Faults - Board-Level Inspection
ECU repair means assessing the original engine control unit instead of automatically replacing it. Where practical, we repair the electronics inside the module so the original coding, VIN matching and immobiliser compatibility are more likely to be preserved.
Replacing an ECU is not always simple. Used or new modules may need coding, immobiliser matching, VIN programming or software work before the vehicle will run correctly.
If the original ECU is repairable, it may avoid extra programming work and reduce vehicle downtime.
ECU testing is not one single test. Different ECUs need different strategies depending on the fault, vehicle network, immobiliser system and how much of the vehicle environment the ECU expects to see.
The first useful test is often visual. Once the ECU is opened, we inspect the board for obvious damage before spending time on deeper electronic testing.
A controlled bench power-up can show whether the ECU has a short, abnormal current draw, missing power rail or internal supply issue.
Many ECUs can be checked for basic communication on the bench. A USB-CAN interface, scan tool or diagnostic setup may help confirm whether the ECU wakes up and talks.
Some ECUs need more than power and CAN wiring. They may expect signals from the BCM, gateway, immobiliser, sensors or other modules before they behave normally.
A diesel engine ECU, petrol ECU, transmission controller, body module or hybrid power unit may all speak over CAN, but they do not behave the same on the bench.
Engine ECUs are often the most demanding to test fully because they may need crank, cam, throttle, sensor and immobiliser signals before all functions become active.
Transmission control modules often rely heavily on CAN communication and can be good candidates for bench communication checks and controlled investigation.
ABS and stability modules may communicate on the bench, but some functions depend on vehicle inputs, wheel speed information, pump behaviour and internal module construction.
EPCU and hybrid / EV modules require extra care. These systems can involve high-voltage safety, complex handshakes and vehicle-specific communication that must be assessed case by case.
Bench testing is useful, but it does not replace vehicle-side diagnosis. The vehicle wiring, sensors, battery, alternator, fuses, relays, security modules and other control units can all affect the way an ECU behaves.
These examples show the kind of evidence we look for: visible board damage, failed communication lines, component-level faults and practical repair limits.
A common ECU repair example involving leaking electrolytic capacitors, board contamination, damaged tracks and unstable signal paths.
A Volvo XC90 smart alternator communication fault where vehicle-side testing pointed toward a LIN circuit fault inside the ECU.
Bench setups can help confirm whether a module powers up, communicates and responds to diagnostic tools, while still respecting the limits of off-vehicle testing.
Magnification is useful for checking fine solder joints, corrosion around ICs, damaged pads, lifted tracks and small components that cannot be assessed properly by eye.
The best ECU repair jobs arrive with clear fault evidence and a module that is still physically suitable for repair.
Scan-tool data, voltage checks, fault codes and workshop notes point toward the ECU rather than a sensor, wiring, fuse, relay or battery issue.
Repairing the original ECU may preserve immobiliser, VIN and configuration information if the module can be recovered.
Repair may be worth investigating when replacement modules are unavailable, expensive, back-ordered or likely to create coding delays.
Modules with localised corrosion, failed components, damaged tracks or known failure patterns are often better candidates than units with severe fire, water or physical damage.
DRG Auto accepts send-in ECU repairs from around New Zealand. Complete the intake form first so your contact details, vehicle details and fault notes arrive with the module.
Device Repair Guy
148 Lambton Quay
Wellington CBD 6011
Phone: 027 531 0155
Yes. DRG Auto inspects and repairs many ECU and ECM modules sent in from around New Zealand. We focus on module-level faults such as no communication, power faults, corrosion, failed components and damaged board tracks.
Usually no. In most cases, mechanics and auto electricians remove the ECU and send the module to us with diagnostic notes and the completed intake form.
No. Bench testing is useful for power, communication and board-level checks, but some faults only appear in the vehicle under heat, vibration, load, immobiliser conditions or with other modules present.
Ideally, yes. The intake form asks for diagnostic evidence such as fault codes, voltage readings, vehicle-side checks and symptoms that are most useful when completed by the technician who tested the vehicle.
No. Some ECUs are sealed, badly burnt, data-corrupt, water damaged beyond practical repair or affected by vehicle-side faults outside the module. We assess repairability before proceeding where possible.
Start with the intake form. Clear diagnostic information helps us decide whether the ECU is a good repair candidate and what testing strategy makes sense.
