The code P1327 indicates that the engine control module (ECM) has detected a malfunction in the knock sensor. This sensor is responsible for detecting abnormal engine vibrations caused by detonation (knocking) so that the ECM can adjust the ignition timing to protect the engine.
⚠️ Possible Symptoms
🚨 Check Engine light or service engine soon light illuminated
🚗 Engine slowdown or reduced performance
🛑 Limp mode (power limitation to protect the engine)
⛽ Increased fuel consumption
🔊 Knocking sounds or unusual noises
❌ Possible Causes
Potential Cause
Description
🎯 Faulty knock sensor
Sensor no longer transmitting correct data
🔌 Damaged sensor wiring
Short circuit, cut wire, melted wire
⚡ Poor connection
Corroded, loose, or broken pins at sensor connector
🧠 Faulty ECM (rare)
Incorrect reading or error in signal processing
🛠️ Repair Procedure
✅ Visual inspection
Locate the knock sensor (often on the engine block).
Check the wiring harness: no cut, chafed, or burned wires.
Inspect the connector: look for bent, broken, or corroded pins.
🔌 Sensor test
Disconnect the sensor.
Measure resistance with a multimeter between sensor pins (typical values: between 500 Ω and 620 kΩ, depending on type).
If no continuity or if value is very high: replace sensor.
📏 Signal test
With an oscilloscope (or advanced diagnostic tool), measure the signal sent during vibrations.
If no signal is detected even when lightly tapping the engine → sensor faulty.
🔁 Replacement
If sensor or wiring is at fault → replace knock sensor and/or repair wiring harness.
Clear the code with an OBD-II scanner and test again.
