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If your Jeep Wrangler shows the trouble code 9ascap, it means there's an issue with the vacuum system. It could be because one of the vacuum hoses has leaks from cracking or wear. Buying a new hose might set you back $30 to $50. Another possibility is a failing vacuum pump, which can run you between $102 to $148 for just the parts.
In a Jeep Wrangler, when you see Code 9ASCAP, it indicates an issue with the vacuum system.