Some models have a problem were the transmission won't shift into fourth gear intermittently. This problem can commonly be repaired with a software update from Honda.
Resources for the Repair and Maintenance of your 2009 Honda Ridgeline
2009 Honda Ridgeline
2009 Honda Ridgeline Problems
On some models a poor connection in the radio antenna harness and sub harness can cause static when going over bumps. Replacing the antenna harness and sub harness will commonly repair this problem.
A chirp noise from the timing belt area can be caused by a tilted idler pulley. Installing a corrective shim from Honda will commonly correct this issue.
A sensor rod that is too long can cause the tailgate not to open in the swing mode. Replacing the sensor rod will commonly correct this issue.
Noise and judder can develop from the rear axle due to differential fluid breakdown. Replacing the fluid will commonly correct this issue.
2009 Honda Ridgeline Questions and Answers
BOTH HAVE TO DO WITH FUEL PUMP OR FUEL INJECTOR ALSO FRONT O2 SENSOR . THE 02 HAS BEEN REPLACED AND NEW NGK LASER PLUGS BY DEALER NOW THEY ARE TELLING ME IT HAS SHORTED INJECTORS AND OR FUEL PUMP P...