One problem related to gas recirculation valve (egr valve) has been reported for the 2010 Honda CR-V. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2010 Honda CR-V based on all problems reported for the 2010 CR-V.
The engine makes a rattling (grinding) noise during cold starts. The noise only occurs when the weather is cold <50 degrees f and only when the engine is cold. The noise does not occur when the weather is warm and the engine is warm. The noise is most likely stemming from the vtc actuator.