Or the oil you have supplied it with is completely the wrong viscosity (most likely, or your oil feeder rail is contaminated with gelatinous old oil, which is blocking rail holes this preventing the lubrication of all moving parts, final option is the temp & pressure sensors are malfunctioning also due to oil not reaching the correct destinations mainly due to viscosity so can't build pressure or because the oil rail is clogged preventing proper circulation. I hope this helps, regards Jem