Service bulletin TSB170054

Manufacturer communication, from NHTSA Manufacturer Communications

Published by NHTSA: Sep 4, 2026
Manufacturer: CUMMINS
NHTSA ID: 11037033
NHTSA category: Service Bulletin/Repair Instructions
Applies to, as stated by NHTSA: CUMMINS B6.7 (model year not stated); CUMMINS ISB6.7 (model year not stated); CUMMINS ISL9 (model year not stated); CUMMINS ISX12 (model year not stated); CUMMINS ISX15 (model year not stated); CUMMINS L9 (model year not stated); CUMMINS X12 (model year not stated); CUMMINS X15 (model year not stated)
Component, as stated by NHTSA: ENGINE

Text of the manufacturer communication

This Technical Service Bulletin describes the verification and resolution of fault codes caused by an aftertreatment diesel exhaust fluid (DEF) tank heater coolant control valve that is not closing completely. This is an update to a previously submitted communication.

Manufacturer document number: TSB170054
Date of the communication: 2026-08-10

View original source on NHTSA.gov

Documents filed with NHTSA (PDF)

Bulletin

NHTSA reuses some ID numbers across record types. If its page lists more than one record, this one is the manufacturer communication dated Sep 4, 2026.

For the 2019 Ram 2500

Laramie Crew Cab

Interrupt

Relevance of 64% and interrupt probability of 53% are both one half or more.

Vehicle relevance: 64%
Attention: 67%
Interrupt probability: 53%

Importance to this owner: 2.9 of 4, important
Vehicle area the notice is about: Engine

Interrupt the owner

This manufacturer communication appears relevant to this vehicle configuration and warrants attention based on the vehicle state.

Decided by jev-1.13.0 in 144 ms from 1,688 input tokens. Jev returns these figures and nothing else. It gives no reasons, and none are written for it here. The figures describe how relevant the notice is, not the condition of any vehicle.

Checked by code against NHTSA's fields

A plain comparison with the structured fields NHTSA filled in. Separate from Jev's decision.

NoNHTSA names this make
NoNHTSA names this model
n/aNHTSA lists model year 2019 for this model

The same notice, every vehicle

Relevance	Attention	Interrupt	State
64%	67%	53%	Interrupt
3%	7%	7%	Ignored
2%	5%	7%	Ignored
2%	5%	6%	Ignored
2%	4%	5%	Ignored
2%	4%	6%	Ignored
2%	5%	7%	Ignored
2%	4%	4%	Ignored
2%	4%	5%	Ignored
2%	5%	5%	Ignored
2%	4%	5%	Ignored
1%	3%	4%	Ignored
1%	4%	5%	Ignored
1%	4%	5%	Ignored
1%	3%	4%	Ignored
1%	3%	4%	Ignored

Select a vehicle to see its attention and interrupt figures above.