The Lotus team has been forced to wrap up its first day of testing at Barcelona early because of a problem with its car.
Romain Grosjean managed just seven laps with the second E20 chassis in the morning session before the team decided to stop running.
Lotus said it had to send the chassis back to Enstone to carry out checks.
"This morning was our first shakedown of our second chassis," said Lotus's Alan Permane. "Once the car was on track it was soon evident that everything wasn't quite as it should be.
"As a precaution we are returning the chassis to Enstone for further investigation. Chassis E20-01, which we used in Jerez, is being sent over and we expect to be on track with that chassis tomorrow."
Team boss Eric Boullier downplayed the issue, saying it was a "minor setback".
"This is a minor setback to our overall test programme. Fortunately we accumulated good mileage in Jerez. If this is the only issue we have during testing then we will still be well prepared for the start of the season.
"We'll be back on track tomorrow with chassis E20-01 and assessing chassis E20-02 back at Enstone."