There are several possible causes for the code P0551, including:
* A faulty power steering pressure sensor
* A leak in the power steering system
* A problem with the wiring or connectors between the power steering pressure sensor and the PSCM
If you have a code P0551 in your 2001 Dodge Neon, it is important to have it diagnosed and repaired as soon as possible. Driving with a faulty power steering system can be dangerous, as it can make it difficult to control the vehicle.