Buy wp20521 - Genuine Cummins Wiring Harness - wisentpartscenter.com

Description

Genuine Cummins 3161935 Electronic Control Module Wiring Harness carries electrical power and control signals between the engine ECM and the internal engine components it manages. This harness is used at the rear of the engine on documented M11, ISM, and QSM11 applications, where correct connector fit and wire routing are critical for reliable injector and engine-control operation.

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

Purpose of the Part

The 3161935 provides the electrical path the ECM needs to operate and monitor the engine. A good harness keeps power and control signals stable between the ECM and engine components, which is especially important on electronically controlled M11 and ISM systems where a poor connection can look like a failed injector, sensor, or ECM.

Issue Symptoms / When to Replace

A damaged harness can cause intermittent fault codes, injector-related faults, rough running, cylinder cutout problems, or electrical issues that change when the harness or connectors are moved. Heat, oil contamination, damaged terminals, broken conductors, and poor connector contact are common problems, so the harness should be inspected before replacing expensive electronic components.

Brand Information

Cummins was founded in Columbus, Indiana in 1919 and develops diesel engines along with the controls and electronic systems used to manage them. The M11 and later ISM family use electronically controlled fuel and engine-management systems, making the engine wiring harness an important link between the ECM and the components it controls.

Installation Notes

Disconnect the negative battery cable before unplugging the ECM or engine harness. Route the replacement harness exactly like the original and make sure every connector is fully seated and locked before startup.

Why Buy 3161935 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

This part is sold as a final sale item and cannot be returned or refunded, including if it was ordered in error. Please confirm fitment before ordering - send us your VIN, engine serial number, or original part number and we will verify it for you. For full details, please refer to the Returns page.