The cost to repair a reverse gear problem varies depending on what is causing the gear failure. If an externally mounted control module solenoid is the culprit you are in luck because it should only cost about $300 to fix. If the cause is an internal component like a bad transmission torque converter you can expect to pay substantially more, between $650 and $1050 including parts and labor. If your check engine light is on and the code starts with the letter P, bring your vehicle down to one of our shops for a free transmission error code read and diagnostic.