AL-KO ATC
(Automatic Trailer Control)
Technical documentation and troubleshooting for the AL-KO ATC (Automatic Trailer Control) system fitted to AL-KO caravan chassis, which monitors and applies braking to counter trailer sway.
Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Possible Cause | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|---|
N/A | AL-KO ATC's LED flashes green | The system is active but waiting to detect movement to complete its self-test | Drive forward a few metres to let the self-test complete and the LED settle to constant green. | DIY Safe |
N/A | AL-KO ATC's LED is constant red | ATC is inactive, but the caravan can still be driven | Remove the 12S or 13-pin plug, wait five seconds, then reconnect it - if the LED returns to green the journey can continue. | DIY Safe |
N/A | AL-KO ATC's LED flashes red | A fault has been detected - severity depends on whether it flashes steadily or shows a more persistent fault pattern | For a recoverable fault, remove the 12S/13-pin plug, wait five seconds, then reconnect - if it doesn't clear, the system may need AL-KO's own diagnostic equipment; a service engineer should check it before the caravan is driven further. | DIY Safe |
N/A | AL-KO ATC's LED isn't lighting up at all | The ATC has no power, or the LED itself is faulty. | Before continuing your journey, check the push-rod's position against page 5 of the AL-KO handbook. Unplug the 13-pin connector, wait 5 seconds, reconnect it, then confirm there's a constant live feed (see page 3 of the AL-KO handbook). | DIY Safe |