P0329 - Knock Sensor 1 Circuit Intermittent

The ECM detected a signal is dropping out intermittently.

Code Overview

The ECM detected a signal is dropping out intermittently.

Common Causes

• Failed knock sensor 1
• Damaged wiring or connector
• Poor sensor mounting or engine noise issue

Diagnostic Steps

1. Inspect knock sensor wiring and connector routing
2. Check for signal changes with scan data or meter testing
3. Look for loose hardware or abnormal engine noise that could confuse the signal

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.