OBD-II Diagnostic Trouble Code
U0411 — Invalid Data Received From Fuel Injector Control Module
U0411 means a module, usually the engine controller, received invalid data from a separate fuel injector control module. The message arrived but the injector status or feedback values were implausible or failed integrity checks. A separate injector driver module is used mainly on some light and medium-duty diesels; most heavy diesels drive the injectors directly from the engine controller, so this code depends on the engine design.
Severity 4/5
Truck-relevant
Stop within 50 mi
Severity
Stop within 50 mi
Invalid Data Received From Fuel Injector Control Module
Code
U0411
Category
Network
Subsystem
Network
Truck-relevant
Yes
What this means for truckers
U0411 (Invalid Data From FICM) — FICM data malformed.
Before you replace parts — try this first
U0411 on the Network system is most often active injector circuit fault such as a shorted injector coil or harness, causing invalid feedback — not a dead part. On commercial diesels especially, work these in order before spending money on parts:
- Confirm the symptoms. Match what your truck is doing to the Symptoms section below. If the code is set but the symptoms are not there, clear the code and re-test after a drive cycle — it may not return.
- Clean and dry the sensor connector. Water, road salt, or oil seeping into a connector is the #1 fake sensor failure. Disconnect, look for green corrosion or moisture, spray with electrical contact cleaner, dry, reseat. Many faults clear here for $0.
- Inspect the wiring harness. Trace the wire from the sensor toward the ECM — look for chafing against the engine block, melted insulation near the turbo or exhaust, or pinch points where a clamp has rubbed through.
- Test the sensor before swapping it. Most Common Causes (below) list the expected voltage or resistance range — a $20 multimeter saves a $300 sensor swap that does not fix the problem.
- Only then, replace the part. Use the OEM or a tier-1 aftermarket. Cheap sensors throw the same code in two weeks.
Symptoms
Check-engine light, rough running, misfire, reduced power or derate, and possibly hard starting or a no-start, often worse when cold. Injector-related codes are often stored as well.
Common causes
- CommonActive injector circuit fault such as a shorted injector coil or harness, causing invalid feedback ($200–$1500)
- CommonLow or unstable battery supply voltage to the injector control module ($100–$700)
- OccasionalWiring or connector fault between the injector control module and the engine controller ($150–$600)
- OccasionalFailed injector control module, including its internal power supply ($800–$2500)
How to fix
Read and repair related injector and engine codes
When to use: First step
Load-test the batteries and check power, ground and network circuits to the injector control module, including its output voltage if the manufacturer specifies a test
When to use: When no other codes point to an injector
Reprogram or replace the injector control module
When to use: After the wiring and supply have been verified
Affects most
No specific vehicle pattern found in our complaint database. This code can appear on any vehicle that supports OBD-II diagnostics.
Related
- → Browse all DTC trouble codes
- → Decode a VIN to check codes for your truck
- → Owner-operator maintenance guides
- → U0401 — Invalid Data Received From ECM/PCM A
- → U0402 — Invalid Data Received From TCM
- → U0403 — Invalid Data Received From Cruise Control Module
- → U0415 — Invalid Data Received From ABS Control Module
- → U0418 — Invalid Data Received From Brake System Control Module
Frequently Asked Questions
Can I drive with code U0411?
Drive with caution. U0411 is severity 4 — stop within ~50 miles. Most commercial diesel codes at this severity (turbo, fuel rail, transmission solenoid) can damage adjacent expensive components if left unrepaired. Get to a service location before highway-speed loads.
How much does it cost to fix U0411 on a commercial truck?
Total repair cost ranges $100–$2500 depending on the root cause. The cheapest fix is usually the first one listed below — Active injector circuit fault such as a shorted injector coil or harness, causing invalid feedback — which is also the most common. On commercial trucks the cost is usually higher than passenger vehicles due to part availability and shop labor rates ($120–185/hour at most truck shops, vs $90–130 at general auto shops). DIY-capable fixes (sensors, hoses, filters) are at the low end; major component replacements (turbo actuator, high-pressure fuel pump, transmission solenoid pack) are at the high end. Always diagnose with a scan tool BEFORE replacing parts — guessing wrong on a $1,500 turbo actuator when the actual issue was a $30 boost hose is a common expensive mistake.
Will U0411 fail a DOT inspection?
U0411 is generally not a direct DOT inspection fail item by itself. Inspectors focus on safety-critical systems (brakes, steering, tires, lights, hours-of-service). However, the check engine light alone can trigger additional inspection scrutiny. Best practice: fix the code and clear it before a planned inspection.
What's the difference between U0411 and related codes?
U0411 is closely related to: U0401 (Invalid Data Received From ECM/PCM A), U0402 (Invalid Data Received From TCM), U0403 (Invalid Data Received From Cruise Control Module), U0415 (Invalid Data Received From ABS Control Module). These codes share the same subsystem (network) and often appear together. If you see this code, scan for the full code list — fixing the root cause usually clears multiple companion codes at once. If only U0411 is set without the companions, the issue is more isolated.
How do I prevent U0411 from coming back after a repair?
For U0411 (Invalid Data Received From Fuel Injector Control Module), prevention centers on the network system. Pay attention to ground connections at every PM — bad grounds are 70% of communication codes. Inspect harness routing for chafe points. Don't disconnect modules with the key on.