Dear Buannan,

Good p.m. and may this find you well. This sounds as if there's a loose connection. A heat build-up resulting from a loose connection, might cause a transient short, that triggers the trouble light. When the current ceases to flow, the connection cools, and conductivity is restored. The warning light goes out.

Alternatively, there might be a bump on the route you drive. When you go over the bump, the impact shakes a weak connection, and so triggers the warning light. As you drive, connectivity is restored by the myriad small bumps, that are part of daily driving.

My suggestion: take a different route to work, and see if the light comes on and then goes out, after the same intervals. If there is no change, the malfunction likey is heat driven. If the light doesn't come on, the malfunction likely is "shock" driven. Taking a different route - whether smoother or bumpier - should change the malfunction pattern, if the malfunction is impact driven.

Finding the weak connection - which could be on the supply or the ground side of the circuit - will take the wiring diagram and a lot of patience.

Hope this helps.

Yours faithfully,

spook