Injector Power Supply - Bad Intelligent Device or Component
The CUMMINS-351 (Cummins) diesel fault code means: Injector Power Supply - Bad Intelligent Device or Component. This is a critical severity code.
- Keep driving?
- No — stop driving
- DIY difficulty
- advanced
- Estimated cost
- $400-$1,500
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Common Symptoms
- Engine protect mode or forced shutdown
- Multiple warning lights illuminated
- Intermittent sensor faults
- Erratic dash gauge behavior
- Possible engine stall
- Battery or charging system warnings
Probable Causes (Ranked by Likelihood)
- Sensor supply (5V reference) circuit fault Very Likely
- Harness chafing causing short or open Likely
- Loose or corroded ground connection Likely
- Multiple sensors drawing on same supply overloaded Possible
- ECM internal supply driver failure Less Likely
Frequently Asked Questions
What is Cummins fault code 351?
Cummins fault code 351 indicates: Injector Power Supply - Bad Intelligent Device or Component. It is a critical-severity fault affecting engine electrical supply or communications.
Can I drive with Cummins fault code 351?
No. Fault code 351 triggers protective engine shutdown or severe derate. Continued operation risks engine damage or stranding. Tow to a Cummins dealer or qualified diesel shop.
How much does it cost to fix Cummins fault 351?
Repair cost is approximately $400-$1,500 including parts, labor, and any dealer programming required. DIY repairs (sensor replacement) fall at the low end; pump, aftertreatment, or ECM work falls at the high end and usually requires INSITE diagnostic software.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
Connect INSITE and read all active codes related to fault 351 -- multiple sensor faults on one supply indicate a supply fault.
Measure 5V reference supply voltage at ECM pin and at the sensor connector; must be 4.9-5.1V stable.
Unplug sensors one at a time while watching live data to find a sensor pulling the supply low.
Inspect harness for chafing where it crosses the engine or frame; look for green or bright corrosion at connectors.
Verify battery voltage and alternator output are within spec (13.8-14.4V engine running).
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J1939-73Application Layer: Diagnostics (defines the SPN/FMI fault-identifier framework)
Commonly Affected Vehicles
- Peterbilt 579, 567 with Cummins ISX/X15
- Kenworth T680, T880 with Cummins X15
- Ram 2500/3500 with 6.7L Cummins
- Ram 4500/5500 with 6.7L Cummins
- Freightliner M2 106 with Cummins ISL9/L9
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