my reply to you assumes you have a komatsu with a Nissan k-21 engine, if not disregard
E27 = output of travel moter temparature is defective.
Spark plugs, maybe a coil pack? E 27 is a crank position sensor error, the ECM is looking for crankshaft speed to increase every time it fires a plug, if it does not see this increase it will throw a code 27, which is usually due to wide plug gaps. This applies only if the unit is running if not, it is crank sensor or wiring.
hi nguyen s.
what is model.