4080965 - Genuine Cummins ECM Wiring Harness - wisentpartscenter.com

Description

Cummins 4080965 ECM Wiring Harness - Genuine Cummins for QSK19 NG

The Cummins 4080965 is a genuine ECM wiring harness for the QSK19 natural gas engine. It connects the ECM to the sensors, actuators and power that run the engine.

Key Functions:

- Connects the ECM to the engine sensors and actuators
- Carries power, ground and signal wiring for the ECM

Fitment & Specifications:

- Cummins QSK19 NG natural gas engine

Verify fitment with us before ordering to ensure the correct part for your application.

Purpose of the Part

The harness is what ties the ECM to the rest of the engine. Every sensor reading going in and every command coming out runs through it. When it chafes, corrodes or a connector fails, you get sensor dropouts and faults that look like bad components when the real problem is the wiring.

Issue Symptoms / When to Replace

Intermittent sensor faults, codes that come and go with vibration or heat, hard starting or no start, and multiple unrelated sensor codes at once. Look for chafed or melted insulation, corroded pins and damaged connectors before replacing sensors.

Brand Information

Cummins builds the harness to fit the QSK19 exactly, with the right connectors and routing to hold up to the heat and vibration on the engine. A genuine harness plugs straight in where cheaper ones tend to fail.

Installation Notes

1. Disconnect the batteries.
2. Note the routing of the old harness before pulling it.
3. Route the new one the same way and secure it at the same clip points, clear of heat and moving parts.
4. Make sure every connector is clean and locks fully.
5. Clear codes and confirm the sensors read before returning it to service.

How to Identify an OEM Part

A genuine harness has the Cummins label with the part number and the correct OE connectors that plug straight in with no adapters or splices. The connector bodies, loom, clip points and length match the factory harness. Aftermarket versions use substitute connectors or thinner wire, which leads to fitment and connection problems.

Why buy from Wisent Parts
  • ⏱️
    Fast shipping
    Orders before 12PM EST ship same business day.
  • 🛡️
    180-day warranty
    All parts covered from delivery date.
  • ↩️
    Easy returns
    30-day returns.
  • ✅
    Verify fitment
    Send VIN/ESN and we’ll confirm.

Shop with confidence

Warranty & Return Information
Warranty Information

Wisent Parts offers a 180-day warranty on all parts from the date of delivery. This warranty covers orders placed directly through our website. If a part fails during this period, we’re here to help - whether it’s a replacement, repair, or refund. For full details, refer to the Warranty page.

Return Information

All electrical parts and final sale items are non-refundable and cannot be returned. Please double-check compatibility before purchase. If you have questions, our support team is here to help before you place your order.