Drive with caution — ABS/stability may be disabled. U0415 means another control module received a data message from the ABS/ESP (anti-lock brake / stability) module, but the value inside it is implausible or out of range. It is a data-quality fault, not a lost-communication fault, and it usually points back to a problem the ABS module itself is already reporting.
What U0415 means
U0415 is a network (U-series) diagnostic trouble code defined under SAE J2012. Modern vehicles connect their controllers over a CAN data bus so they can share readings such as wheel speed, yaw rate, steering angle and brake pressure. U0415 is set by a receiving module when a message does arrive normally from the ABS/ESP control module, but the information it carries is known-invalid: out of its expected range, stuck, or in conflict with the receiver's own sensor inputs. That is the key distinction from a lost-communication code such as U0121. With U0121 the message is missing; with U0415 the message is present but its content cannot be trusted. Because the fault describes the quality of data leaving the ABS/ESP module, the problem almost always originates there rather than in the receiving module. The transmitting module typically stores its own DTC that explains why the data is invalid, which is why the factory guidance is to read every module, diagnose the ABS/ESP module's own codes first, and confirm its wheel-speed, brake-pressure and yaw signals before condemning any wiring or the receiver.
Symptoms
- ABS warning light on, often with the traction control and stability control (ESP/ESC) lights
- Brake warning light illuminated even though the hydraulic brakes still work
- Anti-lock braking, traction control and stability control temporarily disabled
- Features that rely on wheel-speed or brake data misbehave: cruise control, hill-hold, trailer-brake or parking aid drop out
- Speedometer or odometer readings that stick, drop out or read implausibly
Common causes
- A fault inside the ABS/ESP module that makes it broadcast invalid data — usually shown by the module's own stored DTCs
- Bad wheel-speed sensor or brake-pressure/yaw input feeding the ABS module, so it transmits out-of-range values
- Poor power or ground to the ABS/ESP module, causing it to compute and send corrupted readings
- CAN bus wiring problems — chafed, corroded or intermittent circuits distorting the signal between modules
- Software or configuration mismatch after a module replacement or update, so shared data no longer agrees between controllers
Severity & driving advice
Severity: Moderate — Normal braking remains, but ABS, traction and stability control can drop out, so these safety aids are unreliable until the ABS/ESP fault is fixed.
Can I drive? Drive with caution — ABS/stability may be disabled
Diagnostic approach
- Scan every module, not just the engine — Use a scan tool that reads all controllers and record the codes in the ABS/ESP module as well as the module that set U0415. Note freeze-frame data and whether the codes are current or historic. Network faults are diagnosed by looking at both ends of the conversation.
- Diagnose the ABS/ESP module's own DTCs first — Because U0415 reports invalid data coming from the ABS/ESP module, repair its internal faults before anything else. Wheel-speed, brake-pressure or steering/yaw sensor codes there explain why the transmitted value is out of range, and clearing them usually resolves U0415 in the receiving module.
- Check power and grounds at the ABS/ESP module — Verify battery voltage on the module's supply circuits and clean, tight grounds. Low or unstable voltage makes the module calculate and broadcast corrupted data. Load-test the connections and inspect the connector for corrosion, backed-out pins or water intrusion.
- Test CAN bus integrity between the two modules — With power removed, measure resistance across the CAN high/low pair (about 60 ohms on a healthy high-speed bus) and inspect the wiring for chafing, corrosion or repairs near the ABS module. Intermittent bus faults can distort a message so the receiver flags its contents as invalid.
- Verify software levels, then clear and road-test — If the module was recently replaced or reflashed, confirm both controllers run compatible calibrations and are configured to the vehicle. After repairs, clear the codes and drive through the conditions that set U0415 to confirm it does not return before declaring the job done.
Make & model notes
Jeep: On Chrysler/Jeep vehicles U0415 is a stored network fault raised against the ABS module (ESP-equipped models). Check the ABS module for wheel-speed, steering-angle or pressure-sensor codes first; those internal faults are what make the shared data invalid, and fixing them usually clears U0415 elsewhere on the bus.
Ford: Ford treats U0415 as invalid data received from the ABS module — the message arrives but the brake or wheel-speed value does not agree with the receiver's other inputs. Ford's own guidance is to diagnose the ABS (Vehicle Dynamic Systems) module and its DTCs before condemning wiring or the receiving controller.
FAQ
Is U0415 the same as losing communication with the ABS module?
No. Losing communication is a separate code (such as U0121), where the message never arrives. U0415 means the message from the ABS/ESP module does arrive normally but the data inside it is invalid or out of range. The wiring path is working; the content is the problem.
Can I still drive with U0415?
The hydraulic brakes still work, so the vehicle can usually be driven carefully, but ABS, traction control and stability control may be switched off. That reduces your safety margin in hard braking or slippery conditions, so have it diagnosed promptly and drive gently until then.
Why does U0415 usually point at the ABS module itself?
The code describes bad data leaving the ABS/ESP module, so the source of that bad data is almost always inside it — a failing wheel-speed or pressure sensor, a power or ground issue, or an internal fault. The module normally stores its own DTC explaining the invalid value.
Will replacing the ABS module fix U0415?
Not necessarily. Replace the module only after ruling out its sensors, power, grounds and the CAN wiring, and after confirming its own stored codes. If a wheel-speed sensor or a wiring fault is feeding it bad data, a new module will report the same invalid data and U0415 will return.