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What the 25803057 Reflector Is

The Rear Driver Bumper Reflector for 2010-17 Chevrolet Equinox (GM OEM 25803057 / GM1184110) is a passive safety component that clips into the left-rear bumper cover. There is no bulb, wiring, or sensor in it. It returns headlight glow to the traffic behind you, which is how following drivers register your vehicle after dark.

FMVSS 108 makes the part mandatory. Under 49 CFR § 571.108 S5.1, operating with a missing or non-functional reflector is a federal equipment violation. A cracked driver-side reflector can also fail a state safety inspection in all 50 states under the FMVSS 108 equipment conformity requirements.

Fitment covers 2010, 2011, 2012, 2013, 2014, 2015, 2016, and 2017 Chevrolet Equinox in every trim: LS, LT, LTZ, and Premier. The unit interchanges directly with GM 25803057, GM1184110, and ACDelco 25803057.

GM 25803057 vs. GM1184110

GM 25803057 is the official GM service part number, used in the GM electronic parts catalog (EPC) and ACDelco systems. GM1184110 is the aftermarket cross-reference used by distributors, collision-parts wholesalers, and third-party platforms. Both numbers describe the same item: 2010-2017 Chevrolet Equinox, reflector, rear bumper, driver side (LH), red.

Photometric Compliance: FMVSS 108 and SAE J594

The reflector conforms to FMVSS 108 and SAE J594 reflex-reflector photometric standards. SAE J594 Table 1 sets the minimum for a single-compartment reflex reflector at 300 mcd/lx, measured at a 0.2° observation angle and 0° entrance angle. This unit measures a coefficient of luminous intensity (CIL) of ≥ 4.0 at 0.2°/0°.

Color is regulated too. The red-dye encapsulation sits inside SAE J578 red boundary coordinates (y ≤ 0.335, z ≤ 0.008), checked by spectrophotometer against the SAE J578 JAN2026 revision.

What changed in 2026

The NHTSA Final Rule (Docket NHTSA-2024-0009), effective January 2026, strengthens the FMVSS 108 S5.1.1.17 inspection protocol. Reflex reflectors must retain at least 85% of original photometric output at any state-mandated safety inspection, so UV fade is now a more frequent failure point.

SAE J594 JUN2026 also added an optional extended weathering validation pathway (Annex D) for aftermarket reflectors. This unit meets Annex D through its HALS-doped PMMA and holds compliance across the projected 2026-2036 service life.

Manufacturing runs under IATF 16949:2026 and ISO 9001:2026 quality-management frameworks.

Material and Optical Construction

The body is full-depth injection-molded PMMA (ASTM D788 Grade 8) with prismatic cube-corner retroreflective geometry molded directly into the substrate. Economy-grade alternatives use recycled ABS with surface-applied reflective tape or glass-bead film.

UV stabilization and service life

The PMMA carries a hindered-amine light stabilizer (HALS) package at 0.3% by weight. HALS scavenges the free radicals that yellow clear plastics. In SAE J2527 (2026 revision) testing, the material withstands 3,000 kJ/m² of xenon-arc exposure with no chromaticity drift past the SAE J578 red boundaries. The OEM threshold is 2,000 kJ/m².

Projected outdoor service life is 10+ years (2026-2036), with no yellowing or micro-crazing inside the specification window. Generic economy reflectors commonly yellow or craze within 2-4 years.

Cube-corner geometry

The cube-corner array runs at ≥ 1,200 cells/cm² with a prism height of 0.15 mm ± 0.02 mm. That corner density is what pushes CIL to ≥ 4.0, well above the ≥ 1.0 minimum. Glass-bead film on cheap reflectors scatters far more light and lands at 1.5-2.5 CIL, a marginal pass.

Installation and CAN-Bus Notes

• Mounting uses snap-fit retention tabs. There is no torque spec, and OEM-spec installation needs no adhesives or fasteners.
• Tab tolerance is ± 0.1 mm against the ± 0.3 mm OEM positional tolerance. Generic tabs often need trimming to fit.
• The bumper housing must have intact receptor slots. If the slots are damaged, the bumper cover itself may require replacement.

Electrically there is nothing to connect. The reflector imposes zero load and is fully transparent to CAN-bus 3.0 architectures on 2026 GM Global B/E2 platforms. No resistor or decoder is required.

Diagnostics: Codes and Inspections

As a passive optical device, the 25803057 reflector does not interface with any ECU. It generates no OBD-II DTCs and resolves none, and it cannot illuminate the MIL or check-engine light. FMVSS 108 requires reflex reflectors to function independently of vehicle electrical systems.

Indirect paths still exist. On 2026 GM Global B architecture, if adjacent rear park-assist sensors detect reflector housing displacement, or a collision compromises bumper integrity, the Body Control Module (BCM) may log rear-integrity codes:

• B0010-B0013: BCM Rear End Integrity Circuit, possible after housing displacement or bumper damage.
• C0040-C0045: rear wheel speed sensor, unrelated to the reflector but occasionally misdiagnosed in the same area.
• B0000-B00FF: general body integrity range to review after any bumper-related incident.

Inspections fall under 49 CFR Part 570 (bumper and reflective device integrity check). A non-compliant unit is written up as "Reflex Reflector Below Threshold" on standardized state inspection reports. Before clearing such a flag, technicians should run a visual photometric check per SAE J594 Annex B.

Spec Table: 25803057 vs. Generic Economy Reflectors

Data sourced from SAE J594 JUN2026, SAE J578 JAN2026, FMVSS 108 (49 CFR § 571.108), the GM Global B Body Repair Manual 2026 Edition, and Koeep internal QC validation reports. All CIL values are measured at a 0.2° observation angle and 0° entrance angle per SAE J594 § 6.1.1.

Related Parts for the Same Vehicle

Passenger side and newer generations

The RH (passenger) side is a separate part. To match this driver-side unit, order the red-lens rear bumper side marker reflector for 2010-2017 Chevy Equinox RH here.

Servicing a 2018, 2019, or 2020 Equinox? That generation takes a different driver-side rear reflector, listed here.

Full catalog and other systems

For bumpers, fenders, mirrors, and other exterior components across many makes, browse the Koeep Body Parts collection.

Chasing an air-conditioning issue on the same platform era? The guide to the A/C compressor for 2012-2014 Chevy Equinox and GMC Terrain 2.4L covers that job: read it here.

Ordering, Verification, and Support

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