478-7933 ECM Engine Control Module for CAT C7 C9 C11 C15 C18 Engines
Remanufactured ECM 478-7933 — engine control module built as a direct replacement for Caterpillar C7, C9, C11, C15 & C18 engines and select CAT machines.
- Interchangeability: Cross-references 20R-8182, 11R-0333
- Application: Compatible with CAT C7/C9/C11/C15/C18 engines, R1700G/R2900/R3000H LHDs, 6015/6018 shovels & more
- Quality Guarantee: Remanufactured to factory-specified operating parameters, 100% tested, 6-month warranty
- Fast Shipping: Ships within 1-5 business days via DHL/UPS/FedEx
$1,099.00
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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 Engine Control Module (ECM / ECU) is an aftermarket replacement for Caterpillar part numbers 478-7933, 20R-8182 and 11R-0333, built as a direct-fit unit for C7, C9, C11, C15 and C18 industrial, petroleum and off-highway engine platforms.
Every core is fully disassembled, cleaned and rebuilt on a component level. Aged capacitors, injector driver circuits and solder joints are inspected and renewed where required, then each finished unit is bench-tested under simulated load to confirm it will restore factory-specified operating parameters once correctly programmed to your engine.
- Direct replacement fitment — matches the original mounting pattern, connector layout and harness routing, so no wiring modification or bracket fabrication is needed.
- Component-level remanufacture — rebuilt from a tested core with renewed electronic components, refreshed conformal coating and resealed housing gaskets.
- Multi-platform coverage — one interchange group covering hydraulic shovels, load haul dumps, underground articulated trucks, wheel scrapers, rotary drills and petroleum packages.
- Sealed and vibration-resistant housing — die-cast aluminium enclosure with sealed connectors, designed for engine-bay heat, moisture and continuous vibration.
- Function-restoring, not performance-altering — supplied to restore original operating parameters only; no calibration changes of any kind are made to the unit.
- 6-month warranty — repair or replacement service provided if any fault appears within the warranty 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.
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.
| Primary Reference Number | 478-7933 / 4787933 |
| Interchange Numbers | 20R-8182 / 20R8182 | 11R-0333 / 11R0333 |
| Compatible Engine Families | Fits for Caterpillar C7, C9, C11, C15, C18 |
Application Chart — Compatible with Caterpillar Equipment
| Category | Models |
|---|---|
| Engine — Machine | C9 |
| Industrial Engine | C7, C9, C11, C15, C18 |
| Petroleum Engine | C7, C9, C18 |
| Petroleum Package | CX31-C15I, CX35-P800, TH31-C9P |
| Hydraulic Shovel | 6015, 6015 FS, 6018 |
| Load Haul Dump | R1700G, R2900, R2900G, R3000H |
| Underground Articulated Truck | AD22, AD30, AD45, AD45B, AD55 |
| Rotary / Track Drills | MD5075, MD5075C, MD6290 |
| Wheel Scraper | 627G, 637D, 637E, 637G |
| Wheel Tractor | 627G, 637G |
| Site Prep Tractor | 586C |
| Mobile Hydraulic Power Unit | TH43-C18 |
Before ordering: compare the number stamped on your existing module’s data plate against the reference numbers above. If your label does not appear in this list, send us a photo of the plate and we will confirm fitment for you.
Technical Specifications
| Part Name | Engine Control Module / Engine Control Unit (ECM / ECU) |
| Reference Numbers | 478-7933, 20R-8182, 11R-0333 |
| 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 |
| 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 operators report most often before replacement, 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. |
| No communication with diagnostic software | Data link failure between the module and the service tool; check the connector and harness continuity first. |
| Intermittent shutdown while running | Cracked solder joints or a failing internal supply that drops out under heat and vibration. |
| Erratic or impossible sensor readings | Degraded internal reference voltage causing false pressure or temperature values across several channels at once. |
| Repeat injector driver fault codes | Output driver stage failure — codes return on multiple cylinders after new injectors are fitted. |
| 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 — usually terminal once the PCB is affected. |
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. 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 1–5 business days via DHL, UPS or FedEx express, with tracking provided as soon as the label is generated.
- 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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