IndyCar has announced post-race penalties arising from Saturday's inaugural road course race at Indianapolis Motor Speedway, with Schmidt Peterson Motorsports and Team Penske fined $1000 each for technical violations.

The underwing splitter of Simon Pagenaud's #77 car was found in violation of rule 14.6.7.7 of the Verizon IndyCar Series rulebook, while the #3 car drive by Helio Pagenaud was found to have a problem with the differential assembly that breached rule 14.15.7.

But it's the penalty levied at engine manufacturer Chevrolet that looks set to be the most controversial of those announced by IndyCar on Wednesday.

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Chevrolet has been fined $20,000 and penalised 10 points in the manufacturer's championship as a result of two violations of the Verizon IndyCar Series Engine Regulations over torque control (rule 11.2) and traction control (12.1).

Rule 11.2 begins "The only means by which the driver may control the engine torque is via a single chassis-mounted foot pedal or on-board fuel mixture switch," while rule 12.1 states: "Traction or launch control is not permitted. (Anti-stall routines are permitted for the sole use of preventing engine stoppage)."

It is the first known instance of both violations since the series moved to its new 2.2-litre turbocharged V6 format in 2012. Chevrolet was also handed a 50 point penalty after Long Beach for unapproved engine changes, with Honda similarly docked 30 points after the same event

The official announcement about the Indianapolis penalties noted that in each case the affected team/company has the right to contest the penalty - and in Chevrolet's case the engine manufacturer was quick to say that it would be exercising that right.

The member may contest the imposition of the penalty pursuant to the procedures and timelines detailed in the review and appeal procedures of the Verizon IndyCar Series rulebook.

"Chevrolet is in receipt of the penalty levied by IndyCar," noted Jim Campbell, US Vice President Performance Vehicles and Motorsports in a statement. "After carefully reviewing the rules cited by IndyCar in the Rule Violation document, Chevrolet does not agree with IndyCar's assessment.

"We intend to follow the review procedure as set forth in section 12 of the Series rulebook."

It was not immediately known whether Schmidt Peterson Motorsports or Team Penske would also be appealing. Whatever the outcome of their penalties, there is no threat to Pagenaud's victory in the inaugural Grand Prix of Indianapolis or to Castroneves' third place in the event.