Cummins fault code 1681 is the Cummins Aftertreatment Diesel Exhaust Fluid Dosing Unit – Bad Intelligent Device or Component document for the ISX11.9 CM2250 (2010-12) engine platform, a 6-page PDF that reproduces the official fault code write-up read with Cummins INSITE. The aftertreatment diesel exhaust fluid dosing unit meters diesel exhaust fluid into the aftertreatment system through priming, dosing and purge cycles, and its mounting location is OEM dependent.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISX11.9, ISX15, ISB6.7, ISC8.3 and ISL9 CM2250 |
| System / group | ISX11.9 CM2250 (2010-12) / DTCs |
| Fault code | 1681 — PID None, SPN 3361, FMI 12 |
| Warning lamp | Amber |
| Publication reference | Cummins troubleshooting bulletin 2883445; ECM calibration code procedure 019-032 |
| Pages | 6 |
| File size | 0.2 MB |
| Format | |
| Language | English |
What Cummins fault code 1681 means
It sets when the diesel exhaust fluid dosing unit detects an internal error. Diesel exhaust fluid injection into the SCR aftertreatment system is disabled, and engine torque is reduced after extended operation. The document walks a technician through the summary and the guided troubleshooting steps needed to confirm and clear the code.
Document table of contents
- Overview and circuit description
- Component location
- Conditions for running the diagnostics
- Conditions for setting the fault code
- Action taken when the fault code is active
- Conditions for clearing the fault code
- Shop Talk and possible causes
- Associated procedures and guided troubleshooting steps
Applicable truck models
This troubleshooting document covers Cummins ISX11.9, ISX15, ISB6.7, ISC8.3 and ISL9 CM2250 engines in Class 6 to 8 trucks. It is filed under the ISX11.9 CM2250 (2010-12) / DTCs group and also applies to ISX12 CM2250 installations, so confirm the engine dataplate before ordering parts. Cross-reference the calibration revision with Cummins official engine support before clearing the code.
Who needs this Cummins fault code 1681 manual
Heavy-duty diesel technicians, fleet maintenance teams and workshop owners diagnosing a failed diesel exhaust fluid dosing unit use this reference to read SPN 3361 / FMI 12 correctly and to follow the guided steps in INSITE. The possible causes it lists include:
- an internal failure of the diesel exhaust fluid dosing unit
The full 6-page PDF for diesel exhaust fluid dosing unit fault code 1681 is available in the DiagTechPro manuals library; a free account is required to download.
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