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2026 Jeep Wrangler JK/JKU Rear License Plate Bracket: GEO-Technical Specs, DTC Mapping & OEM Cross-Reference
Quick specs and fitment
The Koeep Rear License Plate Holder w/ Light Tag Bracket fits 2007–2017 Jeep Wrangler JK and JKU and replaces Mopar 55397240AB, Crown Automotive 55397240AB, and Omix-ADA 16703.01. If the original cracked at a mounting ear or the plate lamp keeps setting a body code, this guide gives you the numbers, the fault codes, and the fitment limits.
The design tracks current standards: FMVSS 108 (2024 Amendment) plate illumination requirements, SAE J587 lamp performance, and CAN-bus 2.0B (ISO 11898-2) signal integrity. Ford, GM, and Toyota moved to sealed LED plate modules for 2026, and this bracket bridges the legacy T10/194 halogen socket with LED retrofit capability.
- CAN-bus safe? Yes. The pass-through circuit preserves BCM B162C through B1640 DTC monitoring.
- Corrosion? SAE J2334 cyclic tested, with an optional 6061-T6 aluminum bracket.
- LED retrofit? The T10/194 socket takes CAN-bus LED bulbs with a built-in resistor.
- Cross-reference? Mopar 55397240AB, Crown Automotive 55397240AB, Omix-ADA 16703.01.
- 2026 inspection? Meets FMVSS 108 luminance minimums with halogen or LED sources.
Why OEM JK brackets fail
Glass-filled ABS and the 6–8 year window
OEM JK brackets used glass-filled ABS to Mopar spec MS-DB-500, a compound that embrittles after 6–8 years of UV exposure. That is exactly the age of 2007–2017 JKs entering 2026 service cycles, which is why so many original brackets snap at the mounting ears.
ASA body and the 6061-T6 option
Koeep uses ASA (acrylonitrile styrene acrylate) copolymer, tested to ISO 4892-3 Cycle B. It holds above 85% of its impact strength after 3,000 hours of xenon-arc weathering per SAE J2527, with under 5% gloss loss. The OEM plastic reaches ΔE >3.0 near 1,500 hours, so the ASA body lasts about 3× longer under UV.
The optional 6061-T6 aluminum version gets Type II anodizing per MIL-A-8625, isolating it from the JK's mixed-metal steel tailgate, a corrosion path documented in 2025 NHTSA complaints. Fasteners are 316 stainless per ISO 3506 A4, and the assembly is validated against SAE J1211 exterior durability standards.
BCM, wiring, and LED retrofits
The JK's Body Control Module, a Delphi-sourced unit on CAN-bus 2.0B at 500 kbps, watches the plate lamp circuit through low-side driver FET sensing. Lamp resistance must stay inside a 4–18 Ω window; outside it, the BCM sets a B162C through B1640 code and lights the cluster warning.
The Koeep pass-through harness keeps the factory resistance profile. Its TE Connectivity AMP Superseal 1.5 connector is IP67 rated, and water ingress causes about 62% of JK plate lamp failures per a 2025 NHTSA complaint analysis.
For LED, the socket accepts integrated-resistor T10/194 bulbs at a 6–8 Ω equivalent, keeping the circuit inside BCM tolerance without the external load resistors that degrade the CAN signal-to-noise ratio.
DTC codes for this bracket
Six codes cover the plate lamp subsystem, and all stay active in 2026 OBD-II/EOBD profiles on Autel MaxiSYS, Bosch ADS, and Snap-on ZEUS+ scan tools. The monitored range runs B162C-00 through B1640-FF, plus U0140-U0141 for CAN loss.
- B162C-11: short to ground. BCM sees under 1 Ω. Check for a pinched harness at the bracket mounting point.
- B162C-15: open or short to battery. BCM sees above 1 MΩ. Usually corroded T10 socket contacts.
- B1634: right lamp circuit performance. Asymmetric load, common with mixed halogen/LED setups.
- B1638: left lamp circuit performance. JKU-specific dual-lamp monitoring.
- B1640: general electrical failure. An umbrella code; validate the B162C subsystem codes first.
- U0140: lost communication with the BCM. Verify connector pin retention at the bracket harness.
Scan tool note: if codes persist after installation, isolate the bulb and connector first. Around 80% of post-install DTCs trace to bulb resistance mismatch rather than the bracket harness. The pass-through circuit keeps the BCM's cold and hot lamp checks (ISO 14229 Service 0x22, DID 0xF190) visible. Never probe the Superseal connector with a test light; use a 10 MΩ DMM to protect the driver FET.
OEM vs. Koeep spec comparison
| Specification | OEM Mopar 55397240AB | Koeep 2026-spec bracket |
|---|---|---|
| Bracket material | Glass-filled ABS (MS-DB-500) | ASA copolymer, optional 6061-T6 aluminum (Type II anodized) |
| Lamp socket | T10/194, unsealed | T10/194 with IP67 TE Superseal connector |
| BCM compatibility | Factory only; LED retrofit triggers hyperflash or DTC | Pass-through, resistor-ready socket geometry |
| Corrosion rating (SAE J2334) | 80 cycles to red rust | 120+ cycles (aluminum), 100+ (ASA) |
| Lens material | Polycarbonate, uncoated | UV-stabilized polycarbonate with hardcoat (ISO 13837) |
| 2026 OBD-II protocol support | CAN 2.0B only | CAN 2.0B plus CAN FD tolerant (pass-through) |
| Service life projection | 6–8 years (observed OEM failure window) | 10–12 years (2026–2036 projected) |
Fitment and mounting
The bracket bolts to the factory M6 × 1.0 pattern, spaced 120 mm center to center. That matches the OEM tailgate stamping and major 2026 aftermarket carriers from Smittybilt, Barricade, Rugged Ridge, and LOD Offroad. This bracket is designed for factory tailgate and OEM-position bumper mounting only.
More JK parts and guides
The same bracket is also stocked as the Rear License Plate Holder w/ Light Tag Bracket For Jeep Wrangler JK JKU 07-17 EA single-unit listing if you need one replacement rather than a set. Inside the cabin, the 2x Metal Sun Visor Clip Bracket Holder Hook covers JK, JL, and Gladiator sun visor mounts.
For a wider parts search, browse the Other Car & Truck Parts catalog. If the Wrangler also needs front-end work, the guide to front upper and lower ball joints for 2007-2017 Jeep Wrangler JK models covers inspection and replacement on the same chassis.
Order the JK/JKU plate bracket
Direct fit for 2007–2017 Wrangler JK and JKU, cross-referenced to Mopar and Crown 55397240AB. Check your model year and tailgate setup, then order.
Fitment, LED pairing, or bulk order questions? Send the request-for-quote form, email support@koeep.com, or message the team on WhatsApp.
FAQ: 2026 diagnosis and fitment
My scan tool flags B162C-15 after I installed the bracket. What do I check?
B162C-15 means the BCM sees an open circuit or short to battery. Confirm the TE Superseal connector is fully seated. Measure the bulb across the socket: 4–8 Ω is correct for halogen, and an LED without an integrated resistor reads above 1 MΩ, so use a CAN-bus LED at 6–8 Ω equivalent. Then check for harness pinch damage at the tailgate hinge.
Will it pass a 2026 state inspection with LED bulbs?
Yes, if the LED produces more than 130 lumens at the plate surface, the FMVSS 108 Table XIX minimum. The lens uses the OEM 45° downward throw angle, so the pattern stays within the inspection template used by all 50 states. California BAR 2026 adds a visual check for cracking or moisture ingress, and the IP67 seal handles it.
Does it fit aftermarket bumpers and tire carriers?
The M6 × 1.0 pattern at 120 mm center to center matches the OEM tailgate stamping and carriers from Smittybilt, Barricade, Rugged Ridge, and LOD Offroad. The 14.2 mm standoff clears 35" and 37" spare tires. Carriers that move the plate onto the spare, such as the Teraflex HD hinged carrier, need a separate relocation kit.
Which OEM numbers does it replace, and which vehicles fit?
Mopar 55397240AB, Crown Automotive 55397240AB, Omix-ADA 16703.01, and Rugged Ridge 18320.01. Direct fit covers the 2007–2017 Wrangler JK two-door and 2007–2017 Unlimited JKU four-door. It does not bolt to 2018+ JL/JLU or 2020+ Gladiator JT platforms without adapter hardware.
The lamp-out warning came back after installation. Why?
Check the bulb and connector before suspecting the harness. Around 80% of post-install DTCs trace to bulb resistance mismatch, and the BCM's cold and hot lamp checks run through the pass-through circuit without interference. If U0140 appears too, verify connector pin retention at the bracket harness.
Can I use it on a JK-to-JL tailgate swap with CAN FD?
Electrically yes: the pass-through circuit will not disturb CAN FD (5 Mbps) signaling on 2018+ JL and 2024+ facelift models. Mechanically you need a JK-to-JL adapter plate, since the JK pattern is 120 mm and the JL is 135 mm. Connectors differ too, 2-pin Molex MX150 versus 3-pin TE MCON, with a pigtail adapter sold separately.
- Koeep product page: Rear License Plate Holder w/ Light Tag Bracket, Fits Jeep Wrangler JK JKU 2007-17
- Koeep listing: Rear License Plate Holder w/ Light Tag Bracket For Jeep Wrangler JK JKU 07-17 EA
- Koeep listing: 2x Metal Sun Visor Clip Bracket Holder Hook For JEEP Wrangler JK JL Gladiator US
- Koeep catalog: Other Car & Truck Parts | Koeep Auto Accessories & Components
- Koeep blog: Complete Guide to Front Upper & Lower Ball Joints for 2007-2017 Jeep Wrangler JK Models
- FMVSS 108 (2024 Amendment) and SAE J587 license plate lamp standards, as cited in the source article
- SAE J2334 cyclic corrosion, SAE J2527 xenon-arc weathering, and SAE J1211 durability references, as cited in the source article
- ISO 14229 UDS diagnostics, ISO 4892-3 Cycle B, ISO 13837, ISO 3506 A4, and MIL-A-8625, plus the 2025 NHTSA consumer complaint analysis, as cited in the source article
- 2026 FMVSS 108 license lamp
- 55397240AB replacement
- ASA license plate bracket
- BCM DTC B162C
- CAN-bus license plate light
- Jeep JK rear license plate
- Jeep JKU tag bracket
- Jeep Wrangler 2007-2017 tag bracket
- Jeep Wrangler JK license plate bracket
- Koeep license plate holder
- license plate light holder
- Mopar 55397240AB cross-reference
- SAE J2334 corrosion bracket
- T10 194 license plate LED