← Back to list

2005 Chevrolet Tahoe Z71 P0327 Code: Rear Knock Sensor Failure and Repair Steps

Model: 2005 Tahoe Z71 Fault Code: P0327 Posted: 2013-08-12 18:18

I recently purchased a 2005 Chevrolet Tahoe Z71 with a 5.3L V8 engine and 2WD configuration. The vehicle is now displaying a persistent P0327 diagnostic trouble code, indicating a rear knock sensor fault. After removing the rear knock sensor, I found severe corrosion on the mounting surface. I replaced both knock sensors and also installed a new wiring harness as recommended. However, within 300 miles, the P0327 code returned. I’ve been advised that replacing the Powertrain Control Module (PCM) might be necessary, but I want to confirm this before proceeding. If I do replace the PCM, what steps should I take during installation—such as relearning procedures? Additionally, is continued driving with this fault code potentially damaging to the engine? I’m concerned about long-term performance and mechanical integrity.

Related fault codes

P0327

Comments (3)

Anonymous 2013-08-13 07:15

Ensure the sensor mounting surface was clean during installation. Did you apply any sealant? Are there any signs of engine knocking or ticking noises? Also, verify that the wiring harness and connectors are properly connected and free from damage.

Anonymous 2013-08-15 08:00

I just inspected my knock sensor last night and noticed significant rust on the rear sensor mounting surface. I used PB Blaster to clean it thoroughly. I’ve taken photos comparing the front and rear mounts—noticeably, the front appears in good condition while the rear shows heavy corrosion. After cleaning, I swapped the sensors: installed the front knock sensor into the rear position and vice versa. The wiring harness is new and was installed during my initial repair. All connectors are secure and intact. This Tahoe has only 64,000 miles on it.

Anonymous 2013-08-15 08:22

A scan tool would be ideal to help diagnose the PCM's interaction with the knock sensor. In your last post—what was the result after swapping the sensors? Do you have access to a diagnostic scanner? Were the knock sensors purchased from an authorized Chevrolet dealer? Have you reviewed posts by autojoe regarding potential issues such as secondary wiring too close together, engine knocking sounds, or sealant use? These factors can all contribute to P0327 code generation.