IndyCar this week announced that it has rescinded the penalties it levied on engine manufacturer Chevrolet for reported technical breaches at the inaugural Grand Prix of Indianapolis road course race last month.

Chevrolet had 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). Under IndyCar rules, both torque control and traction control are banned from the series.

When the penalties were announced on May 12, Chevrolet immediately served notice that it would appeal. Since then, the manufacturer has been working with series officials reviewing the situation, and on Tuesday it was confirmed that the original penalties had been rescinded.

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Instead, Chevrolet will now be docked 10 manufacturer points "for an unintentional technical violation."

In the run-up to this weekend's Firestone 600 at Texas Motor Speedway, IndyCar has also announced new penalties arising from the last doubleheader event at Detroit.

Chevrolet has lost a further 10 manufacturers points as a result of an early engine change on the #2 Penske entry driven by Juan Pablo Montoya before it had reached the required 2500 mile target required. The early change was needed after Montoya lost positions during the first race with an engine misfire.

Penske itself has also been fined $5000 after it was further found that Montoya's car was underweight in qualifying for the first race at Detroit, in violation of rule 14.3.1.1.1 of the Verizon IndyCar Series rulebook.

In an unrelated matter, Schmidt Peterson Motorsports crew member Don Oldenburg has been placed on probation until August 1 2014 for violating rule 9.3.8, an unspecified break of IndyCar's social media policy.

In all cases, the company, team or person penalised has the right to challenge the decision under the procedures and timelines detailed in the review and appeal procedures of the Verizon IndyCar Series rulebook.