How many knock sensors does a 5.7 Vortec have?
The 5.7 L Vortec V8 has two knock sensors.
These sensors monitor engine detonation and help the engine control module (PCM) adjust ignition timing to prevent pre-ignition and engine damage. On the 5.7 Vortec, GM designed the system with two sensors to monitor both banks of the V8, improving detection under varying loads and conditions.
Knock sensor count and placement
The 5.7 Vortec uses two knock sensors, one on each bank of the engine block. These sensors are positioned to detect knocking from different cylinder groups and feed signals to the PCM for timing adjustments as needed.
Why two sensors?
Having a sensor on each bank provides more reliable detonation detection across the entire engine, allowing the PCM to retard timing more precisely if knock is detected, which protects the engine and maintains performance.
Maintenance and troubleshooting notes
If you’re diagnosing a knock-sensor fault, expect to check both sensors and their wiring, since a failure on either bank can trigger trouble codes. Refer to the vehicle’s factory service manual for exact locations and testing procedures, including resistance checks and signal testing with a scan tool.
Summary
The 5.7 Vortec has two knock sensors, one on each bank of the V8, to monitor detonation and help the PCM manage ignition timing for safety and performance.
