Standard Ignition EFL172 Ambient Light Sensor

Name: Standard Ignition EFL172 Ambient Light Sensor
Brand: Standard Ignition
SKU: FBHK-EFL172
Price: 49.03 USD
Availability: InStock

354 vehicles fit this part

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OE Direct Replacement — Bolt-on fit, no modifications needed

Fitment: Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu, Oldsmobile, Pontiac, Saab, Saturn, and Suzuki, 9-7x, Acadia, Allure, Ascender, Aura, Aurora, Avalanche, Avalanche 2500, Bonneville, Bravada, Caprice, Captiva Sport, Corvette, CTS, DeVille, DTS, Enclave, Envoy, Envoy XL, Envoy XUV, Escalade, Escalade EXT, G6, G8, Grand Prix, H2, LaCrosse, LeSabre, Lucerne, Malibu, Outlook, Rainier, Sierra 1500, Sierra 2500, Sierra 2500 HD, Sierra 3500, Sierra 3500 Classic, Sierra 3500 HD, Silverado 1500, Silverado 1500 HD, Silverado 2500, Silverado 2500 HD, Silverado 3500, Silverado 3500 HD, SRX, SSR, STS, Suburban 1500, Suburban 2500, Tahoe, Trailblazer, Trailblazer EXT, Traverse, Vue, XL-7, XLR, Yukon, Yukon XL 1500, and Yukon XL 2500

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Not what you need? See all Ambient Light Sensor options

Reliable Ambient Light Sensor for Select GM and Other Vehicles

The Standard Ignition Ambient Light Sensor (Part Number EFL172) is designed to provide accurate ambient light detection for a range of vehicles including Buick, Cadillac, Chevrolet, GMC, and more. This sensor helps optimize lighting functions by detecting surrounding light conditions, ensuring proper operation of automatic lighting systems.

Key Features of Standard Ignition EFL172 Ambient Light Sensor

Push-in attachment method for secure and straightforward installation
Black color/finish for discreet integration within vehicle components
Male connector gender with two rectangular plug-in connectors
Two male bullet terminals for reliable electrical connection
Designed specifically for compatibility with multiple GM and other makes/models

Detailed Description of the Ambient Light Sensor EFL172

The Standard Ignition EFL172 ambient light sensor is engineered with a push-in attachment method, allowing for a firm and easy fit within the vehicle’s lighting system. Its black finish ensures it blends seamlessly with the surrounding components. The sensor features two male rectangular plug-in connectors and two male bullet terminals, providing a stable and secure electrical connection. This design supports consistent performance in detecting ambient light levels, which is critical for automatic headlight and dashboard illumination adjustments.

Compatible with a wide range of vehicles such as the Chevrolet Silverado 1500, GMC Sierra 2500 HD, Cadillac Escalade, Buick LaCrosse, and others, this sensor meets the specific requirements of these models to maintain proper lighting system functionality.

Common Applications and Issues Addressed by the EFL172 Sensor

Restores automatic headlight activation and deactivation based on ambient light
Resolves dashboard illumination inconsistencies related to faulty light sensing
Prevents improper lighting behavior during dusk, dawn, or tunnel driving
Eliminates sensor-related error codes or warning lights on the instrument panel
Supports overall vehicle lighting system reliability and safety

Installation Notes and Tips for the Standard Ignition Ambient Light Sensor

Installation of the EFL172 sensor requires careful alignment of the push-in attachment and proper connection of the two male rectangular plug-in connectors. Ensure the sensor is securely seated to avoid intermittent electrical contact. Verify that the bullet terminals are properly engaged to maintain consistent signal transmission. It is recommended to consult the vehicle’s service manual for specific location and removal procedures to avoid damage to surrounding components.

Quality Assurance and Warranty Information

Standard Ignition parts are manufactured to meet or exceed OEM specifications, ensuring reliable performance and durability. The EFL172 ambient light sensor undergoes rigorous quality control testing to maintain consistent functionality. Warranty coverage details should be confirmed with the product documentation or supplier, as Standard Ignition typically offers limited warranties on their electrical components.

Brand	Standard Ignition
Part Number	EFL172
Attachment Method	Push-in
Color/Finish	Black
Connector Gender	Male
Connector Quantity	2
Connector Shape	Rectangular
Connector Type	Plug in
Contents	Sensor
Terminal Gender	Male
Terminal Quantity	2
Terminal Type	Bullet

This part fits 354 vehicles. Search below:

Year	Make	Model	Liters	Cylinders	Position
2015	Cadillac	CTS			N/A
2015	Chevrolet	Silverado 3500 HD			N/A
2015	Chevrolet	Tahoe			N/A
2015	GMC	Acadia			N/A
2015	GMC	Yukon			N/A
2014	Buick	Enclave	3.6L	V6	N/A
2014	Cadillac	CTS			N/A
2014	Chevrolet	Captiva Sport			N/A
2014	Chevrolet	Silverado 3500 HD			N/A
2014	Chevrolet	Tahoe			N/A
2014	Chevrolet	Traverse			N/A
2014	GMC	Acadia			N/A
2014	GMC	Sierra 2500 HD			N/A
2014	GMC	Sierra 3500 HD			N/A
2014	GMC	Yukon			N/A
2014	GMC	Yukon XL 1500			N/A
2013	Buick	Enclave	3.6L	V6	N/A
2013	Cadillac	Escalade	6.0L	V8	N/A
2013	Chevrolet	Avalanche			N/A
2013	Chevrolet	Caprice	3.6L	V6	N/A
2013	Chevrolet	Captiva Sport			N/A
2013	Chevrolet	Corvette			N/A
2013	Chevrolet	Silverado 1500	4.3L	V6	N/A
2013	Chevrolet	Silverado 3500 HD			N/A
2013	Chevrolet	Suburban 1500			N/A
2013	Chevrolet	Tahoe			N/A
2013	Chevrolet	Traverse			N/A
2013	GMC	Acadia			N/A
2013	GMC	Sierra 1500			N/A
2013	GMC	Sierra 2500 HD			N/A
2013	GMC	Sierra 3500 HD			N/A
2013	GMC	Yukon			N/A
2013	GMC	Yukon XL 1500			N/A
2013	GMC	Yukon XL 2500			N/A
2012	Buick	Enclave	3.6L	V6	N/A
2012	Cadillac	CTS			N/A
2012	Cadillac	Escalade	6.0L	V8	N/A
2012	Cadillac	Escalade EXT			N/A
2012	Chevrolet	Avalanche			N/A
2012	Chevrolet	Caprice	3.6L	V6	N/A
2012	Chevrolet	Captiva Sport			N/A
2012	Chevrolet	Corvette			N/A
2012	Chevrolet	Malibu			N/A
2012	Chevrolet	Silverado 1500	4.3L	V6	N/A
2012	Chevrolet	Silverado 3500 HD			N/A
2012	Chevrolet	Suburban 1500			N/A
2012	Chevrolet	Tahoe			N/A
2012	Chevrolet	Traverse			N/A
2012	GMC	Acadia			N/A
2012	GMC	Sierra 1500			N/A
2012	GMC	Sierra 2500 HD			N/A
2012	GMC	Sierra 3500 HD			N/A
2012	GMC	Yukon			N/A
2012	GMC	Yukon XL 1500			N/A
2012	GMC	Yukon XL 2500			N/A
2011	Buick	Enclave	3.6L	V6	N/A
2011	Buick	Lucerne			N/A
2011	Cadillac	CTS			N/A
2011	Cadillac	DTS	4.6L	V8	N/A
2011	Cadillac	Escalade	6.0L	V8	N/A
2011	Cadillac	Escalade EXT			N/A
2011	Chevrolet	Avalanche			N/A
2011	Chevrolet	Caprice	6.0L	V8	N/A
2011	Chevrolet	Corvette			N/A
2011	Chevrolet	Malibu			N/A
2011	Chevrolet	Silverado 1500	4.3L	V6	N/A
2011	Chevrolet	Silverado 2500 HD	6.0L	V8	N/A
2011	Chevrolet	Silverado 3500 HD	6.0L	V8	N/A
2011	Chevrolet	Suburban 1500			N/A
2011	Chevrolet	Suburban 2500			N/A
2011	Chevrolet	Tahoe	5.3L	V8	N/A
2011	Chevrolet	Traverse	3.6L	V6	N/A
2011	GMC	Acadia			N/A
2011	GMC	Sierra 1500			N/A
2011	GMC	Sierra 2500 HD			N/A
2011	GMC	Sierra 3500 HD			N/A
2011	GMC	Yukon			N/A
2011	GMC	Yukon XL 1500			N/A
2011	GMC	Yukon XL 2500			N/A
2010	Buick	Enclave	3.6L	V6	N/A
2010	Buick	Lucerne			N/A
2010	Cadillac	CTS			N/A
2010	Cadillac	DTS	4.6L	V8	N/A
2010	Cadillac	Escalade	6.0L	V8	N/A
2010	Cadillac	Escalade EXT			N/A
2010	Cadillac	STS			N/A
2010	Chevrolet	Corvette			N/A
2010	Chevrolet	Malibu			N/A
2010	Chevrolet	Silverado 1500	4.3L	V6	N/A
2010	Chevrolet	Silverado 2500 HD	6.0L	V8	N/A
2010	Chevrolet	Silverado 3500 HD	6.0L	V8	N/A
2010	Chevrolet	Suburban 1500			N/A
2010	Chevrolet	Suburban 2500			N/A
2010	Chevrolet	Tahoe	5.3L	V8	N/A
2010	Chevrolet	Traverse	3.6L	V6	N/A
2010	GMC	Acadia			N/A
2010	GMC	Sierra 1500			N/A
2010	GMC	Sierra 2500 HD			N/A
2010	GMC	Sierra 3500 HD			N/A
2010	GMC	Yukon			N/A
2010	GMC	Yukon XL 1500			N/A
2010	GMC	Yukon XL 2500			N/A
2009	Buick	Allure			N/A
2009	Buick	Enclave	3.6L	V6	N/A
2009	Buick	LaCrosse	3.8L	V6	N/A
2009	Buick	Lucerne			N/A
2009	Cadillac	CTS			N/A
2009	Cadillac	DTS	4.6L	V8	N/A
2009	Cadillac	Escalade	6.0L	V8	N/A
2009	Cadillac	Escalade EXT			N/A
2009	Cadillac	SRX			N/A
2009	Cadillac	STS			N/A
2009	Chevrolet	Avalanche			N/A
2009	Chevrolet	Corvette			N/A
2009	Chevrolet	Malibu			N/A
2009	Chevrolet	Silverado 2500 HD	6.0L	V8	N/A
2009	Chevrolet	Suburban 1500			N/A
2009	Chevrolet	Suburban 2500			N/A
2009	Chevrolet	Tahoe	4.8L	V8	N/A
2009	Chevrolet	Trailblazer			N/A
2009	Chevrolet	Traverse	3.6L	V6	N/A
2009	GMC	Acadia			N/A
2009	GMC	Envoy			N/A
2009	GMC	Sierra 1500			N/A
2009	GMC	Yukon			N/A
2009	GMC	Yukon XL 1500			N/A
2009	GMC	Yukon XL 2500			N/A
2009	Hummer	H2			N/A
2009	Pontiac	G6			N/A
2009	Pontiac	G8			N/A
2009	Saab	9-7x			N/A
2009	Saturn	Aura			N/A
2009	Saturn	Outlook			N/A
2009	Saturn	Vue			N/A
2009	Suzuki	XL-7	3.6L	V6	N/A
2008	Buick	Allure			N/A
2008	Buick	Enclave	3.6L	V6	N/A
2008	Buick	LaCrosse	3.6L	V6	N/A
2008	Buick	Lucerne			N/A
2008	Cadillac	CTS			N/A
2008	Cadillac	DTS	4.6L	V8	N/A
2008	Cadillac	Escalade	6.2L	V8	N/A
2008	Cadillac	Escalade EXT			N/A
2008	Cadillac	SRX			N/A
2008	Cadillac	STS			N/A
2008	Cadillac	XLR	4.4L	V8	N/A
2008	Chevrolet	Avalanche	5.3L	V8	N/A
2008	Chevrolet	Corvette			N/A
2008	Chevrolet	Malibu			N/A
2008	Chevrolet	Silverado 1500	4.3L	V6	N/A
2008	Chevrolet	Silverado 2500 HD	6.0L	V8	N/A
2008	Chevrolet	Suburban 1500			N/A
2008	Chevrolet	Suburban 2500			N/A
2008	Chevrolet	Tahoe	4.8L	V8	N/A
2008	Chevrolet	Trailblazer			N/A
2008	GMC	Acadia	3.6L	V6	N/A
2008	GMC	Envoy			N/A
2008	GMC	Sierra 1500			N/A
2008	GMC	Sierra 2500 HD			N/A
2008	GMC	Yukon			N/A
2008	GMC	Yukon XL 1500			N/A
2008	GMC	Yukon XL 2500			N/A
2008	Hummer	H2			N/A
2008	Isuzu	Ascender			N/A
2008	Pontiac	G6			N/A
2008	Pontiac	G8			N/A
2008	Pontiac	Grand Prix			N/A
2008	Saab	9-7x			N/A
2008	Saturn	Aura			N/A
2008	Saturn	Outlook			N/A
2008	Saturn	Vue			N/A
2008	Suzuki	XL-7	3.6L	V6	N/A
2007	Buick	Allure			N/A
2007	Buick	LaCrosse	3.6L	V6	N/A
2007	Buick	Lucerne			N/A
2007	Buick	Rainier			N/A
2007	Cadillac	CTS			N/A
2007	Cadillac	DTS	4.6L	V8	N/A
2007	Cadillac	Escalade	6.2L	V8	N/A
2007	Cadillac	Escalade EXT			N/A
2007	Cadillac	SRX			N/A
2007	Cadillac	STS			N/A
2007	Cadillac	XLR	4.4L	V8	N/A
2007	Chevrolet	Avalanche	5.3L	V8	N/A
2007	Chevrolet	Corvette			N/A
2007	Chevrolet	Malibu			N/A
2007	Chevrolet	Silverado 1500	4.3L	V6	N/A
2007	Chevrolet	Silverado 2500 HD			N/A
2007	Chevrolet	Silverado 3500			N/A
2007	Chevrolet	Suburban 2500			N/A
2007	Chevrolet	Trailblazer			N/A
2007	GMC	Acadia	3.6L	V6	N/A
2007	GMC	Envoy			N/A
2007	GMC	Sierra 1500			N/A
2007	GMC	Sierra 2500 HD			N/A
2007	GMC	Sierra 3500 Classic			N/A
2007	GMC	Yukon			N/A
2007	GMC	Yukon XL 1500			N/A
2007	GMC	Yukon XL 2500			N/A
2007	Hummer	H2			N/A
2007	Isuzu	Ascender			N/A
2007	Pontiac	G6			N/A
2007	Pontiac	Grand Prix			N/A
2007	Saab	9-7x			N/A
2007	Saturn	Aura			N/A
2007	Saturn	Outlook			N/A
2007	Suzuki	XL-7	3.6L	V6	N/A
2006	Buick	Allure			N/A
2006	Buick	LaCrosse	3.6L	V6	N/A
2006	Buick	Lucerne			N/A
2006	Buick	Rainier			N/A
2006	Cadillac	CTS			N/A
2006	Cadillac	DTS	4.6L	V8	N/A
2006	Cadillac	Escalade	6.0L	V8	N/A
2006	Cadillac	Escalade EXT			N/A
2006	Cadillac	SRX			N/A
2006	Cadillac	STS			N/A
2006	Cadillac	XLR	4.6L	V8	N/A
2006	Chevrolet	Avalanche 2500	8.1L	V8	N/A
2006	Chevrolet	Corvette	6.0L	V8	N/A
2006	Chevrolet	Malibu			N/A
2006	Chevrolet	Silverado 1500	4.3L	V6	N/A
2006	Chevrolet	Silverado 1500 HD	6.0L	V8	N/A
2006	Chevrolet	Silverado 2500 HD	6.0L	V8	N/A
2006	Chevrolet	Silverado 3500	5.7L	V8	N/A
2006	Chevrolet	SSR	6.0L	V8	N/A
2006	Chevrolet	Suburban 2500			N/A
2006	Chevrolet	Trailblazer			N/A
2006	Chevrolet	Trailblazer EXT			N/A
2006	GMC	Envoy			N/A
2006	GMC	Envoy XL			N/A
2006	GMC	Sierra 2500 HD			N/A
2006	GMC	Sierra 3500			N/A
2006	GMC	Yukon			N/A
2006	GMC	Yukon XL 1500			N/A
2006	GMC	Yukon XL 2500			N/A
2006	Hummer	H2			N/A
2006	Isuzu	Ascender			N/A
2006	Pontiac	G6			N/A
2006	Pontiac	Grand Prix			N/A
2006	Saab	9-7x			N/A
2005	Buick	Allure			N/A
2005	Buick	LaCrosse	3.6L	V6	N/A
2005	Buick	LeSabre	3.8L	V6	N/A
2005	Buick	Rainier			N/A
2005	Cadillac	CTS			N/A
2005	Cadillac	DeVille	4.6L	V8	N/A
2005	Cadillac	Escalade	5.3L	V8	N/A
2005	Cadillac	Escalade EXT			N/A
2005	Cadillac	SRX			N/A
2005	Cadillac	STS			N/A
2005	Cadillac	XLR	4.6L	V8	N/A
2005	Chevrolet	Avalanche 2500	8.1L	V8	N/A
2005	Chevrolet	Corvette	6.0L	V8	N/A
2005	Chevrolet	Malibu			N/A
2005	Chevrolet	Silverado 1500	4.3L	V6	N/A
2005	Chevrolet	Silverado 1500 HD	6.0L	V8	N/A
2005	Chevrolet	Silverado 2500 HD	6.0L	V8	N/A
2005	Chevrolet	Silverado 3500			N/A
2005	Chevrolet	SSR	6.0L	V8	N/A
2005	Chevrolet	Suburban 1500			N/A
2005	Chevrolet	Suburban 2500			N/A
2005	Chevrolet	Trailblazer	4.2L	L6	N/A
2005	Chevrolet	Trailblazer EXT			N/A
2005	GMC	Envoy			N/A
2005	GMC	Envoy XL			N/A
2005	GMC	Envoy XUV			N/A
2005	GMC	Sierra 2500 HD			N/A
2005	GMC	Sierra 3500			N/A
2005	GMC	Yukon			N/A
2005	GMC	Yukon XL 1500			N/A
2005	GMC	Yukon XL 2500			N/A
2005	Hummer	H2			N/A
2005	Isuzu	Ascender			N/A
2005	Pontiac	Bonneville			N/A
2005	Pontiac	Grand Prix			N/A
2005	Saab	9-7x			N/A
2004	Buick	LeSabre	3.8L	V6	N/A
2004	Buick	Rainier			N/A
2004	Cadillac	CTS			N/A
2004	Cadillac	DeVille	4.6L	V8	N/A
2004	Cadillac	Escalade	5.3L	V8	N/A
2004	Cadillac	Escalade EXT			N/A
2004	Cadillac	SRX			N/A
2004	Cadillac	XLR	4.6L	V8	N/A
2004	Chevrolet	Avalanche 2500	8.1L	V8	N/A
2004	Chevrolet	Malibu			N/A
2004	Chevrolet	Silverado 1500	4.3L	V6	N/A
2004	Chevrolet	Silverado 2500	6.0L	V8	N/A
2004	Chevrolet	Silverado 2500 HD	6.0L	V8	N/A
2004	Chevrolet	Silverado 3500	5.7L	V8	N/A
2004	Chevrolet	SSR	5.3L	V8	N/A
2004	Chevrolet	Suburban 1500			N/A
2004	Chevrolet	Suburban 2500			N/A
2004	Chevrolet	Trailblazer	4.2L	L6	N/A
2004	Chevrolet	Trailblazer EXT			N/A
2004	GMC	Envoy			N/A
2004	GMC	Envoy XL			N/A
2004	GMC	Envoy XUV			N/A
2004	GMC	Sierra 2500	6.0L	V8	N/A
2004	GMC	Sierra 2500 HD			N/A
2004	GMC	Sierra 3500			N/A
2004	GMC	Yukon			N/A
2004	GMC	Yukon XL 1500			N/A
2004	GMC	Yukon XL 2500			N/A
2004	Hummer	H2			N/A
2004	Isuzu	Ascender			N/A
2004	Oldsmobile	Bravada			N/A
2004	Pontiac	Bonneville			N/A
2003	Buick	LeSabre	3.8L	V6	N/A
2003	Cadillac	CTS			N/A
2003	Cadillac	DeVille	4.6L	V8	N/A
2003	Cadillac	Escalade	5.3L	V8	N/A
2003	Chevrolet	Avalanche 2500	8.1L	V8	N/A
2003	Chevrolet	Silverado 1500	4.3L	V6	N/A
2003	Chevrolet	Silverado 1500 HD	6.0L	V8	N/A
2003	Chevrolet	Silverado 2500	6.0L	V8	N/A
2003	Chevrolet	Silverado 2500 HD	6.0L	V8	N/A
2003	Chevrolet	Silverado 3500	5.7L	V8	N/A
2003	Chevrolet	SSR	5.3L	V8	N/A
2003	Chevrolet	Suburban 1500			N/A
2003	Chevrolet	Suburban 2500			N/A
2003	Chevrolet	Tahoe	4.8L	V8	N/A
2003	Chevrolet	Trailblazer	4.2L	L6	N/A
2003	Chevrolet	Trailblazer EXT			N/A
2003	GMC	Envoy			N/A
2003	GMC	Envoy XL			N/A
2003	GMC	Sierra 2500	6.0L	V8	N/A
2003	GMC	Sierra 2500 HD			N/A
2003	GMC	Sierra 3500			N/A
2003	GMC	Yukon			N/A
2003	GMC	Yukon XL 1500			N/A
2003	GMC	Yukon XL 2500			N/A
2003	Hummer	H2			N/A
2003	Isuzu	Ascender			N/A
2003	Oldsmobile	Aurora			N/A
2003	Oldsmobile	Bravada			N/A
2003	Pontiac	Bonneville			N/A
2002	Buick	LeSabre	3.8L	V6	N/A
2002	Cadillac	DeVille	4.6L	V8	N/A
2002	Chevrolet	Trailblazer	4.2L	L6	N/A
2002	Chevrolet	Trailblazer EXT			N/A
2002	GMC	Envoy			N/A
2002	GMC	Envoy XL			N/A
2002	Oldsmobile	Aurora			N/A
2002	Oldsmobile	Bravada			N/A
2002	Pontiac	Bonneville			N/A
2001	Buick	LeSabre	3.8L	V6	N/A
2001	Cadillac	DeVille	4.6L	V8	N/A
2001	Oldsmobile	Aurora			N/A
2001	Pontiac	Bonneville			N/A
2000	Buick	LeSabre	3.8L	V6	N/A
2000	Cadillac	DeVille	4.6L	V8	N/A
2000	Pontiac	Bonneville			N/A

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

13498958FC762SLS101SU8708

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.