Cummins fault code 3564 is the official Cummins ISX11.9 CM2250 troubleshooting document for the aftertreatment diesel exhaust fluid line heater relay circuit, reported as SPN 5491, FMI 5 (“Current Below Normal or Open Circuit”) and lights the amber warning lamp. This 13-page PDF covers the circuit description, the conditions that set the code, and the guided troubleshooting sequence run with INSITE electronic service tool.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250 (2010-12), also ISX12 CM2250 (2010-12) |
| System / group | Aftertreatment Diesel Exhaust Fluid Line Heater Relay — DTC diagnostics |
| Fault code | 3564 (SPN 5491, FMI 5) |
| Publication no. | 4022178, 4021704, 4022254, 4022257, 4022250, 2883445 |
| Year / revision | Last modified 31-Dec-2010 |
| Pages | 13 |
| File size | 0.2 MB |
| Format | |
| Language | English |
What Cummins fault code 3564 means
The aftertreatment diesel exhaust fluid line heater relay provides the power supply to line heaters 1, 2, and 3. It is controlled by the aftertreatment diesel exhaust fluid controller. When the current below normal or open circuit condition is detected, SPN 5491 / FMI 5 is logged. The document explains the component location, when the diagnostic runs, and how the code is validated and cleared after a repair.
The manual lists the possible causes of this fault code:
- Open circuit in the aftertreatment diesel exhaust fluid line heater relay circuit
- Open circuit in the aftertreatment diesel exhaust fluid controller harness
- Malfunctioning aftertreatment diesel exhaust fluid controller
Document table of contents
- 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 troubleshooting steps with INSITE electronic service tool
Applicable truck models and engines
This procedure applies to Cummins ISX11.9 CM2250 (2010-12) engines and the related ISX12 CM2250 build, with equivalent aftertreatment procedures across the CM2250 family (ISB6.7, ISC8.3, ISL9, ISX15). The Associated Procedures table cites publication 2883445 for the ISX11.9 CM2250 application. Confirm the ECM calibration revision before condemning a part; see Cummins official engine support for calibration details.
Who needs this Cummins fault code 3564 manual
Heavy-duty diesel technicians, fleet workshops and owner-operators use this document to diagnose SCR and diesel exhaust fluid faults on ISX11.9 CM2250 trucks without guessing. It turns the dashboard warning into a clear, step-by-step repair path.
The full PDF is available in the DiagTechPro manuals library — a free account is required to download.
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