What U0418 means
The Brake System Control Module is present on the data bus but the values it reports are implausible — out of range, frozen, or failing the checksum or rolling-count check.
How the engine computer detects it
The receiving modules reject the data. ABS and ESP functions are limited. Causes include a faulty sensor feeding the module, internal computation errors, a software or calibration mismatch after a repair, or bus interference corrupting the frames.
Written from public technical sources and not yet checked by a mechanic. How we write these pages
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Common causes
- Brake module internal fault Possible
- CAN corruption causing checksum errors Possible
- Gateway module routing CAN messages incorrectly Less likely
How to diagnose U0418
- Read every stored code with an OBD-II scanner. If misfire or fuel trim codes are there too, fix those first: they often cause this one.
- Inspect the parts involved: brake system control module, can bus wiring.
- Work through the causes above from most to least likely, cheapest checks first.
- Clear the code and drive a full drive cycle to confirm the repair held.
Vehicles that report U0418 most
| Vehicle | Years | Reports | Share | Median miles |
|---|---|---|---|---|
| Ford Escape Hybrid | 2005–2020 | 4 | 58k |
Counts of owner complaints to the NHTSA that mention U0418 (26 in total), not failure rates: popular models get more complaints simply because more of them are on the road. Models with fewer than 3 complaints are left out.
Reading the code
- U
- Network
- 0
- Generic (SAE) code
- 418
- Specific fault
Questions drivers ask
Can I drive with code U0418?
Usually yes, carefully. Your hydraulic brakes normally keep working, but ABS, traction and stability control may be off, so the wheels can lock in a hard stop. If the red brake warning light is on, the pedal feels soft or different, or the car takes longer to stop, don't drive: have it towed.
Often reported together
Codes that owners mention in the same NHTSA complaints as U0418. They can point to a shared cause, so it's worth checking them together.
- U0415Invalid Data Received from ABS Control Module6 complaints
- U0401Invalid Data Received from ECM/PCM4 complaints
- C052EABS Pump Motor Control Circuit Low3 complaints
- U0100Lost Communication with ECM/PCM "A"3 complaints
- U0131Lost Communication with Power Steering Control Module3 complaints
- U0155Lost Communication with Instrument Panel Cluster3 complaints
This page is general information, not a substitute for a professional diagnosis. Repair costs are rough estimates for parts and labor and vary by vehicle and region.