This fault code 1669 DTCs document is a troubleshooting PDF for the aftertreatment diesel exhaust fluid tank level sensor circuit on CM2250 engines. It explains the code reason, circuit description, diagnostic conditions, repair validation, and guided tests for both 2-wire and 3-wire sensor paths.
Official fault code 1669 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, ISX15 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; aftertreatment diesel exhaust fluid tank level sensor circuit |
| Publication no. | Not shown; associated bulletin numbers include 4022254, 4022257, 4022250, and 2883445 |
| Year/Revision | Last modified 02-Feb-2010, 11-Jun-2010, and 21-Dec-2010 in visible sections |
| Pages | 28 |
| File size | 0.5 MB |
| Format | |
| Language | English |
Document table of contents
- FAULT CODE 145-fc1669 Fault Code Path Selection
- FAULT CODE 1669 (2-Wire Sensor) – Aftertreatment Diesel Exhaust Fluid Tank Level Sensor Circuit – Voltage Above Normal or Shorted to High Source
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes
- Guided Step 2 – Check the aftertreatment diesel exhaust fluid tank level sensor and circuit
- Guided Step 3 – Check the aftertreatment diesel exhaust fluid controller and harness
- Guided Step 4 – Check ECM calibration and clear fault codes
Applicable truck models
This file applies to Cummins CM2250 engine platforms listed in the extract: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, and ISX15 CM2250. The component location is OEM dependent because the aftertreatment diesel exhaust fluid tank and tank level sensor location can vary by vehicle maker. The procedure directs users to the OEM service manual for exact tank and sensor location, while the fault code logic and electrical checks are Cummins service information. For manufacturer information, visit the Cummins official website.
Who needs this fault code 1669 DTCs manual
This manual is for diesel technicians, fleet workshops, and truck repair businesses diagnosing amber CHECK ENGINE complaints, SCR derate conditions, or DEF level sensor voltage faults. It is useful when INSITE™ shows PID P203D, SPN 1761, FMI 3, or when DEF injection is disabled by a high signal voltage fault.
The troubleshooting content separates 2-wire and 3-wire aftertreatment diesel exhaust fluid tank level sensor configurations. It includes connector inspections for loose, corroded, bent, broken, pushed-back, expanded, wet, dirty, or damaged pins; resistance checks with limits such as less than 10 ohms and greater than 100k ohms; supply checks in the 4.75 to 5.25-VDC range; and ECM calibration review through Procedure 019-032. The document also references Procedure 011-057 for the aftertreatment diesel exhaust fluid controller, Procedure 019-071 for harness repair, Procedure 019-360 for resistance measurement techniques, and Procedure 019-361 for inspection techniques. Full PDF available in the DiagTechPro manuals library, free account required to download.
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