Speaking to reporters before the company's annual meeting, Mary Barra also said that personnel changes related to a deadly ignition switch problem are finished. The company forced out 15 workers last week after an outside attorney blamed them for failing to act on the problem. Five others were disciplined.
Barra further said that there will be some minor adjustments to GM's structure after the investigation by former US Attorney Anton Valukas. He was hired by the company to find out why it took more than 10 years for GM to recall 2.6 million small cars with the faulty switches. They have been blamed for more than 50 crashes and at least 13 deaths.
"I have nothing to conclude that there's anything like this," she said of the ignition switch recall. "We've been digging pretty deep."
Barra said there likely will be a few more recalls, but those related to the review should be announced by the end of June.
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She said moves made by the company already are changing its culture, which Valukas blamed for helping to hide the ignition switch problem. Employees, she said, are responding to the changes. Two have alerted her to safety issues, but she did not elaborate on them.
Board Chairman Tim Solso gave Barra a vote of confidence, saying the board is pleased with her work and that she and her team "will lead General Motors to make the necessary changes.