U015E Lost Communication With Automated Driving Interface Module means another control module has stopped receiving messages from the vehicle’s Automated Driving Interface Module, commonly called the ADIM. The fault is usually caused by a power supply problem, a CAN bus communication issue, a damaged connector or wiring, or a failed module—not automatically by a defective radar or camera.
This is an information-focused diagnostic guide. Because the ADIM is connected to safety-related driver-assistance systems, avoid replacing parts based on the code alone. A proper diagnosis must identify whether the module is missing power, unable to communicate on the network, or internally malfunctioning.
What Does U015E Mean?
Diagnostic trouble code U015E is a network communication code. It is set when one or more vehicle computers cannot exchange expected messages with the Automated Driving Interface Module within a specified period.
The ADIM name and exact system layout vary by manufacturer. On some vehicles, this module acts as an interface between advanced driver-assistance sensors, vehicle communication networks and other control units. It may be involved in functions such as adaptive cruise control, lane-centering assistance, forward collision warning, automated emergency braking or highway driving assistance.
U015E does not prove that every automated-driving or ADAS component has failed. It only confirms that communication with the designated module was interrupted or became unreliable.
Common Symptoms of the U015E Code
The symptoms depend on whether the communication failure is intermittent or permanent. A vehicle with a momentary voltage drop may store U015E without obvious drivability problems, while a vehicle with a completely offline ADIM may disable multiple assistance features.
- Check Engine, service driver-assistance or warning messages on the instrument cluster
- Adaptive cruise control, lane-centering or forward collision functions unavailable
- “Driver assistance systems unavailable” or similar message
- Multiple U-codes stored in several control modules
- ADAS warning lights that appear after starting the vehicle
- Intermittent loss of camera, radar or automated-driving features
- Communication failure with the ADIM during a scan-tool module test
In many cases, normal engine operation continues because the ADIM is not responsible for basic fuel, ignition or transmission control. That does not make the problem harmless: safety assistance may be unavailable without the driver realizing how many systems have been disabled.
Most Likely Causes of U015E
1. Low battery voltage or unstable power
A weak 12-volt battery is one of the most frequently overlooked causes of communication codes. During cranking, voltage can fall far enough to reset the ADIM or another gateway module. The code may then be stored even though the module works normally after the engine starts.
Check the battery before chasing network wiring. A fully charged battery commonly measures around 12.4–12.7 volts with the vehicle off, while charging voltage is often approximately 13.5–14.8 volts, depending on the vehicle’s charging strategy. Use the manufacturer’s specifications when available.
2. Blown fuse, poor ground or missing module power
The ADIM may have separate ignition, constant-battery and communication-related power circuits. A blown fuse, loose ground point, corroded terminal or failed power distribution component can make the module appear completely dead.
Do not check a fuse visually only. Test for voltage on both sides of the fuse with the circuit energized, then verify voltage and ground directly at the ADIM connector. A ground may look clean but still develop excessive voltage drop under load.
3. CAN bus wiring or connector damage
Most U015E faults involve Controller Area Network communication. Open circuits, shorted CAN High or CAN Low wires, corrosion, pushed-back terminals and water intrusion can prevent messages from reaching the module.
Pay particular attention to areas disturbed during windshield replacement, front bumper repairs, camera replacement, accident repair or aftermarket accessory installation. ADAS wiring is often routed near bumpers, grilles, windshields and body harness junctions where it can be pinched or exposed to moisture.
4. A different module is disrupting the network
The ADIM is not always the failed component. A shorted control module elsewhere on the same CAN bus can pull the network down and create a U015E code in several unrelated modules. This is why a complete vehicle scan is more useful than reading the code from the engine computer alone.
5. Software, configuration or calibration problems
Some vehicles require module programming, configuration or ADAS calibration after battery replacement, collision repair, module replacement or windshield work. A software mismatch may cause communication errors even when the wiring and power supply are sound.
6. Internal ADIM failure
An internal module fault becomes more likely when the ADIM has correct power, reliable ground, intact CAN wiring and no network short, yet remains absent from the scan tool. Water damage, overheating, internal memory failure and failed communication circuitry are possible causes.
How to Diagnose U015E Correctly
- Record every code. Perform a full-system scan, not just an engine scan. Note which modules report U015E and whether other codes identify low voltage, lost gateway communication or a CAN bus fault.
- Check the vehicle battery and charging system. Test resting voltage, cranking voltage and charging performance. Clear the code only after recording freeze-frame or failure details.
- Confirm ADIM communication. Try to access the ADIM with a factory-level or high-quality aftermarket scan tool. If it communicates, review its own codes and live data before condemning it.
- Inspect fuses, power and grounds. Use a wiring diagram to identify all ADIM feeds. Test circuits under load and perform a voltage-drop test on the ground side.
- Inspect connectors and harnesses. Look for moisture, green corrosion, bent pins, loose terminal tension, damaged shielding and harness sections recently repaired or moved.
- Test the CAN network. With the correct modules asleep and the battery disconnected when specified by the service procedure, many high-speed CAN networks measure approximately 60 ohms across CAN High and CAN Low. This is only a general reference; the manufacturer’s procedure takes priority.
- Check network voltage and waveform if necessary. A multimeter can reveal an obvious short, but an oscilloscope is better for intermittent faults, distorted signals and missing communication frames.
- Verify programming and calibration requirements. If the module or a related sensor was replaced, confirm that software configuration and ADAS calibration were completed according to the service information.
A useful professional shortcut is to compare the scan-tool communication status with the physical symptoms. If several modules disappear at once, suspect a shared power, ground, gateway or CAN fault. If only the ADIM is unavailable and its feeds are correct, the ADIM or its local harness becomes a stronger suspect.
U015E Lost Communication With Automated Driving Interface Module: Fixes
The repair depends on the test results. Common fixes include charging or replacing a weak battery, repairing a blown-fuse circuit, cleaning a corroded ground, repairing CAN wiring, replacing damaged terminals or securing a loose connector.
If water entered the connector, drying it is not enough. The source of the water must be corrected, and terminals with corrosion or lost tension should be replaced. Applying dielectric grease to the outside of a sealed connector may help protect it, but grease should not be used to hide damaged terminals or poor electrical contact.
When the ADIM itself is replaced, many vehicles require software programming, vehicle configuration and a post-repair diagnostic scan. Related cameras, radar units or driver-assistance sensors may also require calibration. Calibration performed on an uneven surface or with incorrect targets can create additional warnings even after communication has been restored.
Can You Drive With U015E?
If U015E is active, assume that one or more driver-assistance features may not operate. The vehicle may still be mechanically driveable, but you should not rely on adaptive cruise control, lane keeping, collision warning or automatic braking until the system has been checked.
Drive only as necessary and follow the warning messages in the owner’s manual. If the vehicle has steering, braking or other safety-related warnings, or if multiple systems are offline, arrange professional diagnosis rather than continuing to use the vehicle normally.
Common Diagnostic Mistakes
- Replacing the ADIM before testing its power, ground and CAN circuits
- Assuming a camera or radar is defective simply because ADAS features are disabled
- Reading only the generic OBD-II engine codes instead of scanning every module
- Ignoring a recently replaced battery, windshield, bumper or aftermarket device
- Clearing the code repeatedly without checking whether the ADIM remains offline
- Performing ADAS calibration before repairing the underlying communication fault
Key Takeaway
U015E indicates a loss of communication with the Automated Driving Interface Module, not a guaranteed module failure. Start with the battery, fuses, grounds and a complete vehicle scan, then test the CAN network and inspect areas affected by recent repairs. Once communication is restored, complete any required programming and ADAS calibration before returning the vehicle to normal use.
Frequently Asked Questions
Is U015E a serious code?
It can be serious because driver-assistance functions may be disabled. The engine may run normally, but adaptive cruise control, lane assistance or collision-avoidance features should not be trusted until the fault is repaired.
Can a weak car battery cause U015E?
Yes. Low cranking voltage can reset the ADIM or interrupt CAN communication. Test the battery and charging system before replacing any ADAS component.
Will clearing U015E fix the problem?
Clearing the code only removes the stored record. If the communication fault is still present, U015E will return, often immediately or after the next drive cycle.
Does U015E mean the ADIM must be replaced?
No. Power loss, poor grounds, damaged CAN wiring, connector corrosion and a different module disrupting the network are common alternatives. The ADIM should be replaced only after those possibilities are tested.
Is ADAS calibration required after fixing U015E?
Not for every repair, but calibration or module programming may be required if an ADIM, camera, radar sensor, windshield or related mounting component was replaced or disturbed. Follow the vehicle-specific service procedure.
