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The 12582704 Fuel Injector: 2026 Specs, Fitment, and DTC Guide

If you wrench on a 2005–2008 GM Ecotec 2.2L or 2.4L, the 4PCS 12582704 fuel injector set is the part to know. It covers the Chevrolet Cobalt, HHR, and Malibu, the Pontiac G5, G6, and Solstice, and the Saturn Aura, Ion, Sky, and Vue.

The demand behind this number is measurable. As of May 2026, the global automotive fuel injector market has reached USD 80.39 billion, pushed by tightening SAE J1832 low-pressure injector standards and FMVSS 301 fuel-system integrity mandates. SAE J1832 classifies the 12582704 as a low-pressure (sub-1000 kPa), electronically actuated multiport fuel injector (MFI), and it remains a high-demand aftermarket SKU.

With GM's 2026 rollout of CAN FD diagnostic protocol enhancements across the Global A electrical architecture, precise injector circuit monitoring matters more than ever. A flow-matched set built to the Genuine Denso 195500-4670 architecture is your cheapest insurance against P0200-series DTCs and P0300 random misfire codes.

Specification Table

Why the 12582704 Still Rules the 2026 Aftermarket

Gasoline direct injection is projected to grow at 6% CAGR through 2033, yet port fuel injection holds a dominant 23% component share of the fuel system market. The reason is durability and serviceability. The Ecotec L61 (2.2L) and LE5 (2.4L) combustion chambers demand the Denso 12-hole atomization profile — single-hole or pintle-only budget injectors cannot replicate it.

Build Details That Matter

• 440C martensitic stainless steel (UNS S44004) body and pintle seat — HRC 58–60 hardness, resistant to oxidative wear from oxygenated fuels.
• Viton GF-600S fluorocarbon O-rings (ASTM D2000 M2HK714 A14 B37) — continuous E85 exposure and underhood temperatures above 150°C (302°F), service from −40°C to +150°C.
• Laser-welded coil windings with class-H (180°C) insulation — no internal solder joints to fatigue after 60,000+ miles of thermal cycling, the failure that kills remanufactured units.
• PTFE pintle guide bushings that eliminate the carbon-adhesion failure documented in GM TSB 08-06-04-006B.
• 100% helium leak testing to ≤1.0 × 10⁻⁶ mbar·L/s before packaging.

Flow-Matching: The Hidden Performance Multiplier

GM's factory service tolerance for flow variance across a bank is ±5%. This set is flow-matched to within ±1.5% across all four units, and that gap shows up directly in long-term fuel trim (LTFT) stability.

One injector flowing 8–10% rich or lean can push LTFT past ±10% and store P0171 (System Too Lean) or P0172 (System Too Rich) before a hard misfire code ever sets. With OBD-II readiness monitors adopting stricter threshold tables under EPA Tier 4 enforcement, a flow-matched 12582704 set closes that failure path.

OEM Cross-Reference: Six Numbers, One Injector

The consensus chain is short: GM 12582704 = GM 12606110 = GM FJ718 = Denso 195500-4670 = ACDelco 217-2436 = Delphi FJ10569. All six part numbers are mechanically and electronically interchangeable on the L61 (2.2L) and LE5 (2.4L) Ecotec platforms, with no PCM recalibration required.

If the box on the counter shows a different number, check it against the six above. If it maps, it is the same injector — order the 4PCS 12582704 set and cover the full bank in one purchase.

Complete Vehicle Fitment Matrix

Match your model and year before ordering:

DTC Mapping: What a Worn 12582704 Throws

Per the NHTSA VIN-Indexed DTC Frequency Report (Q1 2026), P0200-series codes rank among the top 15 most frequently set powertrain codes across GM Delta and Kappa platform vehicles still in active service. Here is the map for this injector:

• P0201–P0204: Injector Circuit/Open, cylinders 1–4. The PCM does not detect the inductive voltage spike on the driver circuit. Test resistance first — it should read 12.5 Ω ±0.8 Ω across the injector terminals.
• P0300–P0304: Random or cylinder-specific misfire. Paired with a P020x code, it is almost certainly injector-related. Run a power-balance injector kill test.
• P0171 / P0172: Fuel Trim Lean/Rich (Bank 1). A partially clogged or leaking injector skews STFT past ±10% and forces LTFT corrections the PCM cannot hold.
• P0171 + P0300 together: the clogged 12-hole nozzle signature — lean misfire at light throttle that clears under wide-open-throttle enrichment.

Symptoms You Will Feel First

• Cold-start stumble — carbon fouling on the nozzle tip disrupts cold enrichment atomization, worst below 10°C (50°F) ambient.
• Intermittent idle misfire — Mode $06 data shows elevated misfire counts on one cylinder (TID $53, CID $01–$04). Confirm with an injector balance test on a CAN FD-capable scan tool.
• Fuel odor or black smoke — a leaking injector seat (PTFE seal degradation) feeds raw fuel into the cylinder and washes oil from the walls.
• Falling fuel economy — LTFT above +8% (Mode $06, TID $02, CID $01) is usually the first indicator before a DTC sets.

The 2026 CAN FD Factor

GM's CAN FD diagnostic protocol replaces CAN 2.0B and enables 64-byte payload frames for real-time injector pulse-width monitoring. On 2025+ crossovers such as the Trax and Envista, the PCM tracks pulse-width asymmetry at sub-0.5 ms resolution — variance above 3% between injectors trips a pending P0200-series code before the misfire monitor even activates. Make sure your scan tool supports CAN FD before running balance tests on those platforms.

Replace All Four, Not One

GM service guidance (Document ID: 2187654) and the 2026 Standard Gas Fuel Injection Program both recommend bank-level replacement on high-mileage engines. Injectors can drift 5–8% outside specification after 80,000+ miles, so one fresh unit among three worn ones creates a trim imbalance the adaptive strategy cannot fully correct — and the aged three degrade faster beside it. The 4PCS 12582704 set from Koeep removes that cascade risk with four flow-matched, plug-and-play injectors.

Lifecycle: Why This SKU Stays in Demand Through 2030

GM's Delta and Kappa platform population exceeds 2.8 million units in North America alone (2005–2010 model years), and well-maintained examples average 18–22 years on the road. That is why the 12582704 is projected to remain in active aftermarket demand through at least 2030.

The money follows the metal. The 2026 fuel injector aftermarket is valued at USD 18.5 billion — 23% of the total fuel system market — with port-fuel-injection replacements comprising 67% of unit volume. The 12582704/12606110 cross-reference ranks among the top-50 global SKUs by turnover in that segment.

Koeep maintains this part under continuous revision control, with biannual audits against SAE J1832 and ISO/TS 16949 quality benchmarks. Comparing options across the whole fuel system first? Browse the Air & Fuel Delivery collection to see everything in one place.

More Fuel Injectors Koeep Stocks

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ATV and UTV owners should read the complete guide to the 0455124 injector for Polaris Sportsman, Outlaw 110, and RZR 170 (2016–2025) before ordering for those machines.

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