Walker 242-1391 Ignition Knock (Detonation) Sensor

OE Replacement Knock Sensor for GM Applications

Walker 242-1391 is a Sensor Only ignition knock sensor built for OE-style replacement on select Buick, Cadillac, Chevrolet, and GMC vehicles. It monitors engine vibration and sends the signal the ECU uses to adjust ignition timing when knock is detected, helping protect the engine and maintain smooth drivability.

Compatible With 2019-2025 Chevrolet Silverado 1500, 2019-2025 GMC Sierra 1500, and other late-model GM platforms listed below, this sensor is built to match factory electrical and frequency requirements. The Walker Sensor Only line focuses on direct-fit replacement parts for vehicles that need the sensor itself, without the harness assembly.

Key Features

• Walker Products ignition knock (detonation) sensor, part number 242-1391
• OE replacement design for factory-style knock detection
• Matches OE frequency range, sensitivity, and electrical output
• Pin terminal design with 1 female connector, 2 male terminals, and oblong connector shape
• Heat- and oil-resistant construction for engine-block and cylinder-head environments
• Direct-threaded fitment for original sensor locations

How It Works

The knock sensor detects abnormal engine vibration associated with spark knock or detonation and relays that information to the ECU. The engine computer can then adjust ignition timing in real time to reduce the chance of internal damage, drivability complaints, and fuel economy loss. Walker 242-1391 is tuned for the resonant frequency of the application it serves, which supports accurate knock detection on the listed Buick Envision, Cadillac CT4, Chevrolet Blazer, and GMC Acadia platforms, among others.

Common Issues This Part Can Address

• Diagnostic trouble codes such as P0325 or P0330
• Audible spark knock or detonation under load
• Incorrect ignition timing response from the ECU
• Rough drivability caused by failed knock detection
• Reduced engine protection from a faulty sensor signal

Installation Notes

Install Walker 242-1391 in the original threaded sensor location and connect it using the factory-style electrical interface. Verify the connector shape, terminal count, and vehicle application before installation. This part cross-references ACDelco 213-3520 and Delphi AS10045 for the same application.

• Fits 2020-2025 Buick Encore GX, Sensor Only
• Fits 2022-2025 Buick Envision, Sensor Only
• Fits 2020-2025 Cadillac CT4, Sensor Only
• Fits 2022-2025 Cadillac CT5, Sensor Only
• Fits 2021-2025 Cadillac XT4, Sensor Only
• Fits 2022-2025 Cadillac XT5, Sensor Only
• Fits 2022-2025 Cadillac XT6, Sensor Only
• Fits 2022-2025 Chevrolet Blazer, Sensor Only
• Fits 2023-2025 Chevrolet Colorado, Sensor Only
• Fits 2019-2025 Chevrolet Silverado 1500, Sensor Only
• Fits 2021-2025 Chevrolet Trailblazer, Sensor Only
• Fits 2024-2025 Chevrolet Traverse, Sensor Only
• Fits 2022-2025 GMC Acadia, Sensor Only
• Fits 2023-2025 GMC Canyon, Sensor Only
• Fits 2019-2025 GMC Sierra 1500, Sensor Only
• Fits 2022 Chevrolet Silverado 1500 LTD, Sensor Only
• Fits 2022 GMC Sierra 1500 Limited, Sensor Only
• Fits 2021 Buick Envision, Exc.Harness; Sensor Only
• Fits 2020-2021 Cadillac CT5, Exc.Harness; Sensor Only
• Fits 2020-2021 Cadillac XT5, Exc.Harness; Sensor Only
• Fits 2021 Cadillac XT6, Exc.Harness; Sensor Only
• Fits 2020-2021 Chevrolet Blazer, Exc.Harness; Sensor Only
• Fits 2020-2021 GMC Acadia, Exc.Harness; Sensor Only
• Fits 2019-2020 Cadillac XT4, Exc.Harness; Sensor Only
• Fits 2019 Cadillac CT6, Sensor Only

Quality Assurance

Walker Products builds this knock sensor as an OE replacement component with application-specific tuning for frequency range, sensitivity, and electrical output. The Sensor Only product line is aimed at direct replacement of the sensor element for the listed GM vehicles, including Chevrolet Silverado 1500 and GMC Sierra 1500 applications.