Have twin 377, 320 he engines.

Took the boat out this morning and when I powered up it went into Guardian mode. Oil pressure and water temperature sending gauges are normal. Water PSI is at 15. Scan the engines and there are no fault codes. Check at the engines, switches at the shifter mechanism. Both are good.

Any ideas? Thanks Terrie...

Man I have been fighting this on a friends crownline for about a year now. Sporadic issue on it. I found corrosion behind the ignition switch, cleaned/replaced every single ground on it. Replaced buss bars. Cleaned connections at temp,oil, and drive oil senders. Replaced trim senders. Finally got it I think. I believe it was combination of ignition and grounds.

Question to make sure - how do you know it's going into Guardian mode ?

Is it doing the wont turn over 2k thing and alarming?