Knock Sensor 2 Circuit Input Intermittent

What it means

P0334 is stored when the Knock Sensor 2 Circuit Input signal drops out or jumps erratically for short periods. Intermittent faults are almost always connector, wiring or vibration related.

This entry is compiled automatically from the standard definition and typical diagnostic practice for this type of fault. A detailed, reviewed article is in preparation.

Symptoms

• Flashing or steady check engine light
• Engine shaking, especially at idle
• Loss of power under load
• Fuel smell from the exhaust
• Risk of catalytic converter damage if ignored

Common causes

1. Damaged, chafed or corroded wiring in the Knock Sensor 2 Circuit Input circuit
2. Corroded, loose or water-damaged connector terminals
3. Failed Knock Sensor 2 Circuit Input component (sensor, solenoid or actuator)
4. Poor ground connection for the module or component
5. Faulty control module driver (rare, confirm all else first)

How to diagnose

1. Read freeze frame data and note when the code set (cold start, under load, after rain)
2. Inspect the Knock Sensor 2 Circuit Input connector for bent pins, corrosion and water; wiggle the harness with the engine running and watch live data
3. Measure supply voltage and ground at the connector with the key on
4. Check the signal wire for shorts to ground or battery and for continuity to the control module
5. Test or substitute the Knock Sensor 2 Circuit Input only after wiring and connectors are confirmed good
6. Clear the code and complete a drive cycle to confirm the repair

Related codes

Nearby codes in this group

• P0333Knock Sensor 2 Circuit High Input (Bank 2)
• P0335Crankshaft Position Sensor "A" Circuit
• P0332Knock Sensor 2 Circuit Low Input (Bank 2)
• P0336Crankshaft Position Sensor A Circuit Range/Performance
• P0331Knock Sensor 2 Circuit Range/Performance
• P0337Crankshaft Position Sensor A Circuit Low Input
• P0330Knock Sensor 2 Circuit (Bank 2)
• P0338Crankshaft Position Sensor A Circuit High Input