سلونوئید قفل دنده عقب معیوب

The solenoid preventing reverse being engaged at speed, faulty. It is a protection device — selecting reverse while moving forward would damage the transmission — so it fails toward refusing rather than permitting.

The complaint is reverse that will not engage, on a transmission that drives forward normally, which reads as a serious internal fault and usually is not. Circuit codes are the winding and the harness, settled with a meter at the connector. A performance code with a sound circuit means the mechanism, which on many designs is a hydraulic interlock rather than a mechanical one — so check line pressure and the selector's reported position before condemning it, since a module that does not believe reverse was selected will inhibit it correctly.