FleetCom_Coolant Sensor Other

Detroit Powertrain Coolant Level Sensor Change & CPC Logic

RESISTANCE CURVE- Original Detroit

Coolant Level Sensor
RESISTANCE
LEVEL

(NORMAL)

(LOW)
Around 100 ohms
,,....
__ _.....
-........

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RHJ?,on$ible SuJElier:

• OTNA
(VERY LOW)
• HDEP launched with coolant level sensor p/n - 06-93316-000 &

p/n 06-96622-000 (superseded sensor).

• Used with 0013, DD 15, DD 16 in New Cascadia, Western Star X

Series, and M2+

• Resistance values for the coolant level very low and low are

numerically out of sequence

• Because the resistance bands are so tight with this sensor, any

time we have a poor connection (added resistance) in the

circuit, it resulted in a critical low fault code fault

• If the engine was programmed for shutdown, then the

engine would shutdown when there may not actually be

a low coolant level scenario
RESISTANCE CURVE- Commonized

Cummins/Detroit Sensor
RESISTANCE (OHMS)
LEVEL

(NORMA L)
Around 500 ohms
(LOW)

(VERY LOW)
• Commonized 06-96622-001 (gray body)

with vehicles built 10/7/2024 for Detroit

engines for P4 and WST X Series
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,
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--,,....,,.

-...,.
uo
•
....
• Same sensor historically used on Cummins­

powered units

• Gray material designed to mate with gray

electrical connector

• Resistance values are in ascending order and

more spread out.

• Should eliminate unintended shutdowns due to

critical low resistance value and provide

correct warnings based on the resistance value

• CPC R22.3 brought parameterized (L3)

thresholds for each coolant level sensor type
For testing the sensor, the float (06-93738-000) is available as a service tool

New (gray) sensor is NOT interchangeable w ith the prior (black) sensor➔ electrical connector on harness is keyed & color-coded for visual indicator

Diagnostics/manual cc,,,ers testing both sensors

Installing the incorrect sensor will result in inaccurate readings (example: installing a black sensor in place of an original gray sensor would result in the CPC

never seeing a low coolant level status; gray in place of black would show persistent low coolant level fault)
Daimler Truck
Fleet Product Updates I Field Service I November 2025

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Last update on 2026-03-30 / Affiliate links / Images from Amazon Product Advertising API

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