Need a specific ECM not listed here? Contact us with the engine serial number or ECM tag info, and we'll locate the exact match or find an equivalent module ready for installation.

Understand What a Diesel ECM Does (And Why It Matters)

A diesel Engine Control Module monitors and commands the vital systems that keep your engine running efficiently. Unlike older mechanical systems, ECM-equipped engines rely entirely on this unit to:

• Monitor boost, RPM, load, and air-fuel ratios

• Trigger injectors with precise pulse width

• Control idle speed and cold-start behavior

• Reduce emissions and limit black smoke

• Store fault codes for diagnostic review

When an ECM fails, symptoms include engine shutdowns, erratic idling, injector misfiring, poor throttle response, and false fault codes.

Find ECMs for the Diesel Platforms That Keep Your Fleet Moving

Goldfarb supports a wide range of ECM-controlled diesel engines from Class 8 trucks to industrial generators. Common platforms include:

Mack E7 and AMI Series

• V-MAC ECMs with calibration for E7 mechanical-electronic systems

• Rebuilt units include software mapping and driver ID lockout reset

Caterpillar Heavy-Duty Engines

• ECMs compatible with models like C10, C12, and 3406E

• Programmed for timing, boost curves, and sensor signals

Industrial Off-Road and Genset Systems

• ECMs for diesel engines used in mining, marine, or stationary power

• Custom configurations are supported with correct programming

Need help identifying compatibility? Our team can validate fitment using your existing ECM tag, CPL code, or VIN.

Pick the Right ECM Format Based on Budget and Project Scope

We offer three ECM types, each tested to meet specific needs, from critical uptime to cost-effective repairs.

New ECMs

• Factory direct or OEM-level new units

• Clean slate software and calibration

• Ready for immediate programming and installation

Rebuilt ECMs

• Professionally reprogrammed and resealed

• Fault history cleared, capacitors replaced

• Validated communication protocols

• Rebuilt to match the original timing curves and data.

Used ECMs

• Tested for boot-up and code communication

• Ideal for temporary installs or diagnostics

• Cleaned, inspected, and functional

All ECMs, regardless of type, are verified on test benches for output signal integrity and connectivity across pins.

Not Sure Which ECM You Need? Let Us Match It

Matching an ECM to your engine requires precision. We help eliminate guesswork. Provide us with any of the following:

• ECM tag or label (e.g., 12MS514MR GEM514M)

• Engine serial or model number

• VIN or equipment application

• Calibration ID or Mack V-MAC generation

• Fault code history or symptoms

Once verified, we'll supply the correct ECM or recommend a rebuildable option from our warehouse.

Know the Signs of a Failing or Corrupted ECM

Your diesel engine may not throw an obvious fault code when the ECM begins to fail. Be alert for:

• Random shutoffs or no-crank conditions

• Blank dashboard or "No Comm" errors

• Throttle delay or stuck idle RPM

• Sensors are reading inaccurately despite replacement

• Persistent codes with no mechanical root cause

An ECM replacement can resolve multiple engine issues at once, with no need to replace injectors, sensors, or wiring harnesses.

Rebuilt ECMs That Perform Like New at a Fraction of the Cost

Rebuilt diesel ECMs from Goldfarb are the go-to solution for fleet managers and techs alike. Every unit goes through:

• Component-level circuit inspection

• Capacitor and processor reconditioning

• EPROM and flash programming reset

• Complete software remapping (if needed)

• Vibration and heat cycling under simulated loads

You receive a ready-to-install ECM that works like new, without paying dealership markups.

Enjoy Fast Shipping and Trusted Customer Support

Goldfarb ships diesel ECMs across North America and globally with a reliable, same-day turnaround for in-stock items.

• Fast dispatch for orders placed before 3:30 PM EST

• Carrier flexibility with UPS, FedEx, USPS, and DHL

• Rockville, MD, warehouse pickup available

• ECMs packaged in static-free sealed boxes

• Tracking and invoices are emailed at the time of shipment

All shipments require a verified street address; no P.O. boxes are accepted due to anti-tamper packaging standards.

Why Diesel Techs and Shop Owners Rely on Goldfarb for ECMs

With over two decades in diesel part distribution, Goldfarb & Associates is the trusted source for reliable ECMs that work the first time.

Here's what sets us apart:

• 60,000+ diesel parts processed since 1997

• Complete inventory of rare and rebuildable ECMs

• Bench-tested communication and calibration

• Rebuild programs for ECM cores

• Live chat and phone support from honest diesel techs

• Competitive pricing with volume discount options

Whether you're a shop owner, parts buyer, or fleet operator, we help you replace failed ECMs with speed and certainty.

Frequently Asked Questions

Are ECMs plug-and-play?

Some are. Most require programming to match your VIN or injector codes. We can guide you through installation requirements.

Do rebuilt ECMs come with updated software?

Yes. Our rebuilt ECMs are reflashed to OEM calibration specs and fault-free before shipping.

How long do ECMs typically last?

Most ECMs last over 10 years, but extreme heat, vibration, or voltage surges can reduce their life. Replacement is often more cost-effective than repair.

Can I send in my failed ECM for a rebuild?

Yes. We accept core returns and offer rebuild services. Contact us for RMA approval and lead time.

What if I install an ECM and it doesn't work?

Our satisfaction guarantee ensures compatibility and functionality. Reach out to us and we'll troubleshoot or replace.

Order Your ECM Today & Take Control of Your Diesel System 

Goldfarb & Associates is here to help you find the correct ECM, get it shipped fast, and ensure your engine runs as it should. With one of the deepest diesel ECM inventories in the country and unmatched support, we make diesel electronics reliable and straightforward. Browse our ECM inventory now or contact us to confirm your part number before placing an order.