For 1990-2009 cars

Condition | Causes
--- | ---
Groaning or growling noise in the steering pump |

• | Grounded power steering lines

• | A scored pressure plate

• | A scored thrust plate

• | A scored rotor

• | A worn cam ring

• | A low pressure relief reservoir cap

• | Restricted fluid lines (high back pressure)

• | Air ingestion in the return line

• | A damaged flow control valve

• | Low fluid level

• | Loose pump mounting bolts

Rattle noise in the steering pump |

• | Damaged pump rotor or vanes

• | Damaged pump bearings

Swishing noise in the steering pump | A damaged flow control valve
Whining noise in the steering pump |

• | A scored pump shaft bearing

• | A scored pressure plate

• | A scored thrust plate

• | A damaged cam ring

• | A damaged cam rotor

• | Damaged cam vanes