This Cummins DEF fault 3565 document is a troubleshooting PDF for an aftertreatment diesel exhaust fluid dosing valve voltage-above-normal fault. It explains how the DEF controller commands the dosing valve with a PWM signal, what happens when the circuit fails high, and how to validate repairs with INSITE™ electronic service tool.
Official Cummins DEF fault 3565 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also references ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISF2.8 CM2220, and ISF3.8 CM2220 in associated procedures |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; aftertreatment diesel exhaust fluid dosing valve circuit |
| Publication no. | 4022254 for ISB6.7 CM2250 associated procedures |
| Year/Revision | Last Modified: 28-Dec-2010; overview last modified 11-Jun-2010 |
| Pages | 18 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 3565 – Aftertreatment Diesel Exhaust Fluid Dosing Valve – Voltage Above Normal, or Shorted to High Source
- 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 2 – Check the aftertreatment diesel exhaust fluid dosing valve and circuit.
- Guided Step 3 – Check the aftertreatment diesel exhaust fluid controller and harness.
- Guided Step 4 – Check if an ECM calibration update is available.
Applicable truck models
The file is listed for Cummins ISB6.7 CM2250 DTC service information and includes associated procedure references for several CM2250 and CM2220 engine families: ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, ISF2.8 CM2220, and ISF3.8 CM2220. The component is installed in the exhaust system on the aftertreatment decomposition tube before the SCR catalyst, with position varying by aftertreatment architecture and OEM installation. For official engine and service information, visit Cummins.
Who needs this Cummins DEF fault 3565 manual
Workshop technicians, fleet mechanics, and diagnostic tool users need this Cummins DEF fault 3565 manual when the amber CHECK ENGINE lamp or MIL is linked to SPN 5394 FMI 3. It is useful for checking the dosing valve, the DEF controller harness, connector pins, resistance values, pin-to-ground shorts, pin-to-pin shorts, open circuits, and ECM calibration status.
The procedure identifies the fault effect as disabled diesel exhaust fluid injection into the aftertreatment system, with possible torque reduction if the fault remains active for an extended period. It also lists likely causes, including a short to battery voltage in the diesel exhaust fluid dosing valve, a short to battery voltage in the diesel exhaust fluid controller harness, or a malfunctioning diesel exhaust fluid controller. The guided checks use keyswitch OFF and ON conditions, connector disconnection steps, resistance measurements, and INSITE fault status checks. Repair decisions include replacing the dosing valve, repairing or replacing the aftertreatment diesel exhaust fluid controller harness, calibrating the ECM when required, or contacting a Cummins® Authorized Repair Location after all steps have been completed and checked again.
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