348-2377 Engine Control Module ECM for Caterpillar 3126B C-12 C-15 Truck Marine
Remanufactured 348-2377 engine control module (ECM), fits for Caterpillar 3126 through C18 truck and marine engines.
- Interchangeability: 348-2377 / 3482377
- Application: 3126, 3126B, 3126E, C-10, C-12, C-15, C-16, C-18 truck engines; C7–C18 marine; D5N, D6N, 953C, 963C, 561N machines
- Condition: Remanufactured from a tested core, rebuilt at component level and bench-tested
- Programming Required: Module must be flashed to your engine serial number — send us your ESN, VIN and data plate photo after purchase
$1,199.00
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Bench-Tested - Every unit powered up and function-tested before dispatch.
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6-Month Warranty - From delivery, against defects in materials and workmanship.
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30-Day Returns - Unused items in original packaging. RMA required.
Product Details
This remanufactured Electronic Engine Control Module (ECM / ECU) is an aftermarket replacement for Caterpillar part number 348-2377, built as a direct-fit unit spanning the full on-highway truck engine range from 3126 through C18, marine propulsion engines, and a group of track machines including D5N and D6N tractors.
Each unit begins as a tested core and is rebuilt at component level. The board is cleaned and inspected under magnification, with capacitors, injector driver components and solder joints renewed wherever measurement calls for it. Housing seals and gaskets are replaced, conformal coating is refreshed, and the finished module is bench-tested under simulated load so it will restore factory-specified operating parameters once programmed to your engine.
- Direct replacement fitment — original mounting pattern, connector layout and harness routing, so no wiring modification or bracket fabrication is required.
- Component-level remanufacture — rebuilt from a tested core with renewed electronics, refreshed conformal coating and resealed housing.
- Full truck engine range — 3126, 3126B, 3126E and the C-series from C7 and C-10 through C-12, C-15, C-16 and C-18.
- Marine propulsion coverage — 3126B, C7, C-12, C15 and C18 marine engines, plus C18 generator set and 3126B and C-12 gen set engine applications.
- Track machine applications — D5N and D6N track-type tractors, 953C and 963C track loaders and the 561N pipelayer.
- Sealed and vibration-resistant housing — die-cast aluminium enclosure with sealed connectors, built for engine-bay heat, moisture and continuous vibration.
- Function-restoring, not performance-altering — supplied to restore original operating parameters; no calibration changes of any kind are made to the unit.
- 6-month warranty — repair or replacement service if any fault appears within the period.
Important: Programming Is Required Before Use
This module is not plug-and-play. Every engine carries its own calibration file, and the unit must be flashed to your specific serial number by a qualified technician using approved diagnostic software before the engine will run correctly. This matters especially here, since the same hardware serves an on-highway truck, a marine propulsion engine and a track-type tractor — only the correct calibration makes it work on yours.
Please send us the following after purchase:
- Engine Serial Number (ESN) and Vehicle Identification Number (VIN)
- Clear photographs of your current ECM / ECU unit
- A clear photograph of the engine data plate
Installation and removal of an engine control module should always be carried out by an experienced technician. Disconnect the battery before any work begins.
Fitment & OEM Interchange
The following reference numbers are listed for cross-reference and identification purposes only. All trademarks belong to their respective owners.
| Reference Number | 348-2377 / 3482377 |
| Compatible Engine Families | Fits for Caterpillar 3126, 3126B, 3126E, C7, C-10, C-12, C-15, C-16, C-18 |
| Condition | Remanufactured — rebuilt from a tested core |
| Installation | Direct replacement — programming required |
Application Chart — Compatible with Caterpillar Engines and Machines
| Category | Models |
|---|---|
| Truck Engine | 3126, 3126B, 3126E, C7, C-10, C-12, C-15, C-16 (C16), C-18 (C18) |
| Marine Engine | 3126B, C7, C-12 (C12), C15, C18 |
| Gen Set Engine | 3126B, C-12 |
| Generator Set | C18 |
| Track-Type Tractor | D5N, D6N |
| Track Loader | 953C, 963C |
| Pipelayer | 561N |
Before ordering: the 3126 and C-series families ran across many build years and emissions specifications, and a single engine designation can carry more than one module variant. Compare the number stamped on your existing module’s data plate against 348-2377, and if your label shows a different number, send us a photo of the plate along with your ESN and we will confirm fitment before you buy.
Technical Specifications
| Part Name | Electronic engine control module / engine control unit (ECM / ECU) |
| Reference Numbers | 348-2377, 3482377 |
| Condition | Remanufactured, bench-tested before dispatch |
| Installation Method | Direct replacement — no wiring or bracket modification |
| Programming | Required — must be flashed to your engine serial number |
| Application Types Covered | On-highway truck, marine propulsion, generator set and track machine installations |
| System Voltage | 12V / 24V DC — application dependent, confirm on data plate |
| Housing Material | Die-cast aluminium with sealed gasket interface |
| Connectors | Sealed multi-pin harness connectors, original pin layout |
| Circuit Protection | Conformal-coated PCB, moisture and vibration resistant |
| Testing | 100% functional bench test under simulated load |
| Warranty | 6 months — repair or replacement service |
| Package Contents | 1 x engine control module (mounting hardware not included) |
This unit is an emissions-related component. It is supplied to restore factory-specified performance only, and is not modified, re-calibrated or altered in any way.
Common Failure Symptoms
A failing engine control module rarely dies all at once. These are the symptoms reported most often on truck and marine installations, and the checks worth running first.
| Symptom | What It Usually Points To |
|---|---|
| Engine cranks but will not start | No injector drive signal reaching the fuel system; verify power and ground at the module before condemning it. |
| Truck shuts down and restarts on the road | Intermittent internal supply or cracked solder joints, aggravated by road vibration and heat cycling. Note whether it correlates with rough surfaces or with time at temperature. |
| No communication with diagnostic software | Data link failure between the module and the service tool; check the connector and harness continuity first. |
| Loss of power or derate under load | A failing module acting on corrupted boost or rail pressure input. Rule out fuel filters, air restriction and turbo condition before replacing. |
| Marine engine faults after winter layup | Condensation inside the housing or connector during months of temperature cycling in a damp bilge. Inspect the connector for green corrosion before assuming a board fault. |
| Repeat injector driver fault codes | Output driver stage failure — codes return on multiple cylinders after new injectors are fitted. |
| Erratic or impossible sensor readings | Degraded internal reference voltage causing false pressure or temperature values across several channels at once. |
| Rough running, misfire or unstable idle | Inconsistent timing or fuelling control that persists after fuel system components have been ruled out. |
| Corrosion or moisture inside the connector | Failed housing seal allowing water ingress onto the board — a particular risk on marine installations and on trucks that see regular washdown. |
Rule out the cheap causes first. Battery condition, ground straps, charging system voltage, harness chafing and corroded pins imitate module failure far more often than the module itself. On older 3126 and C-series trucks the chassis ground connections are a frequent culprit, and on marine engines it is almost always moisture at the connector. Confirm with a full diagnostic scan before replacing.
Shipping & Quality Guarantee
- 100% quality control — every module is functionally bench-tested and visually inspected before it leaves our facility.
- Dispatch in 1–3 business days via DHL, UPS or FedEx express, with tracking provided within 24–48 hours.
- Protective packaging — anti-static bag, foam-cushioned carton, sealed against moisture for international transit.
- 6-month warranty — if a fault arises within the period, we provide repair or replacement service.
- Technical support — send us your ESN, VIN and data plate photo and our team will confirm fitment before and after purchase.
Shipping & Customs Notice
The listed price covers the product, shipping and handling only. It does not include import duty, VAT, GST or any local taxes or customs clearance charges. Any such fees are levied by your national customs authority and remain the buyer’s responsibility. Please check your local import regulations before ordering.
All brand names, part numbers and model designations are used for identification and cross-reference purposes only. This product is manufactured and tested to aftermarket replacement standards and is not associated with, sponsored by or endorsed by any vehicle or engine manufacturer. All trademarks are the property of their respective owners.
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