The 2019 Chrysler Pacifica triggering P0325 indicates the knock sensor circuit on bank 1 has low or no signal. The knock sensor detects engine knock (detonation), allowing the ECM to retard timing and protect the engine.
Understanding P0325
P0325 indicates the ECM detects insufficient signal from the bank 1 knock sensor. This may result from sensor failure, wiring problems, or connection issues. Without proper knock detection, the engine may not have protection from detonation.
Pacifica Engine
The 2019 Pacifica uses the 3.6L Pentastar V6 engine. Bank 1 is typically the rear bank (passenger side on transverse-mounted engines). The knock sensor mounts on the engine block and detects vibration frequencies associated with knock.
Knock Sensor Function
The knock sensor is essentially a microphone tuned to knock frequencies. It produces a voltage signal when knock occurs. The ECM uses this signal to retard timing, preventing engine damage from detonation.
Common Failure Causes
Sensor element failure produces low or no signal. Corroded connections reduce signal strength. Damaged wiring from heat or abrasion causes circuit problems. Improper sensor torque affects its ability to detect vibrations.
Diagnosis Procedure
Test sensor resistance—it should be within specification. Check connector for corrosion. Verify wiring continuity from sensor to ECM. Inspect for physical damage to sensor or wiring.
Repair Costs
Knock sensor replacement costs $200-400 at Chrysler dealers. Wiring repair runs $100-300. Some aftermarket sensors are available at lower cost but quality varies.