Author Topic: Cummins Coolant Level Sensor Leakage Issues; TSB100033  (Read 120 times)

0 Members and 1 Guest are viewing this topic.

Offline Ken Carpenter

  • Ken Carpenter, Jr.
  • Administrator
  • Sr. Member
  • *****
  • Posts: 333
  • May your obstacles turn into stepping stones!
Cummins Coolant Level Sensor Leakage Issues; TSB100033
« on: September 24, 2019, 07:08:35 AM »
This post covers two Cummins Technical Service Bulletins related to conditions in which the coolant level sensor can malfunction, allowing coolant to seep into the wiring harness and into other sensors and other electronic control system devices. It impacts a wide number of ISB, ISC, ISL, and ISM engines and related control modules. The second relates to the durability of an issue associated with the 2-pin coolant level sensors and use of Extended Life Coolants. Note: In addition to this post and related attachments, additional information may be found on the Coolant System board of this forum.
As documented in the attachments, symptom can vary by engine family, OEM and applications. Symptoms include, but are not limited to:
•   Slow coolant consumption.
•   Coolant level sensor fault codes.
•   Electronic system component corrosion or electrical connections wet with coolant.
•   White Smoke. This only occurs on engines with an after treatment system and an after treatment diesel particulate filter differential pressure sensor.

The resolution is described along with additional specificity on sensor fault code errors as well in the attached TSBs.

The existence of the TSB’s came as a result of an oil test that did not support a dealer’s recommendation for an engine replacement. Discovery of the TSB and related coolant bulletins (see Cooling System board) helped identify the actual cause of the Coolant Level Sensor failure codes.
2005 Winnebago Journey 39K, C7 350HP
Jeep Grand Cherokee, Airforce One
Diesel RV Club Officer & Board Member