P0321 - Ignition/Distributor Engine Speed Input Circuit Range/Performance

Engine speed input signal is erratic or out of range.

Code Overview

Engine speed input signal is erratic or out of range.

Common Causes

• Crank/cam signal issue
• Ignition module fault
• Wiring problem
• Reluctor damage

Diagnostic Steps

1. Watch RPM signal during crank and stall events
2. Inspect crank and cam sensor connectors
3. Check for rubbed-through wiring near the engine

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

Browse the closest code-family pages when the same fault pattern often shows up nearby.

Next Steps

Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.