OBD-II trouble code
U0214: Lost Communication with Remote Function Actuation (RFA) Module
A module on the network can no longer hear from the Remote Function Actuation (RFA) module — the controller for keyless entry, remote start, and passive entry/push-button start. Remote and key-fob features may stop working.
Quick facts
- System
- Network
- Category
- Network Communication
- Severity
- Low severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $80 – $900
- DIY difficulty
- Intermediate DIY
What does U0214 mean?
U0214 is set when another module on the vehicle's communication network stops receiving messages from the Remote Function Actuation (RFA) module. The RFA module handles remote keyless entry, remote start, and on vehicles equipped with it, passive (keyless) entry and push-button start — receiving the radio signals from key fobs and key-fob-free proximity sensing, then communicating with the body, security, and engine modules to lock, unlock, and start the vehicle. It's a networked controller, so when the network loses contact with it, the monitoring module logs U0214.
The causes follow the standard communication-code pattern: lost power or ground through a blown fuse, a corroded ground, or a wiring fault; a corroded, loose, or backed-out connector terminal; chafed, broken, or shorted CAN/bus wiring; an internally failed RFA module; or another module on the bus disrupting communication for everyone. Because the RFA module is sometimes mounted in the trunk, under a seat, or behind interior trim, water intrusion and connector corrosion in those areas are worth checking.
The symptoms center on remote and keyless functions: the key fob may not lock, unlock, or remote-start the vehicle, passive entry may stop recognizing the fob at the door, and push-button start may require holding the fob to the start button or fail to work normally. On most vehicles you can still start and drive using the mechanical key or the fob's backup start procedure, so U0214 is generally a low-severity, driveable fault. It's worth fixing for the convenience and security features it disables, and because passive-entry vehicles can be confusing to operate when the RFA module is offline.
Common causes
- Blown fuse feeding the RFA module
- Corroded or loose ground at the RFA module
- Corroded, loose, or backed-out terminal at the module connector
- Water intrusion reaching the module in the trunk, under a seat, or behind trim
- Chafed, broken, or shorted CAN/bus wiring to the RFA module
- Failed Remote Function Actuation module
- Harness disturbed during accessory, remote-start, or trim work
- Another module on the bus disrupting network communication
Symptoms
- Key fob won't lock, unlock, or remote-start the vehicle
- Passive (keyless) entry not recognizing the fob at the door
- Push-button start requiring the fob held to the button, or not working
- Remote start unavailable
- Messages about key or keyless system in the driver information display
- Scan tool cannot communicate with the RFA module
- Vehicle can usually still be started with the mechanical key or backup procedure
Diagnostic steps
- 1.Scan all modules and confirm the RFA module is the unreachable one while others respond — if several modules are missing, suspect the bus itself.
- 2.Rule out a simple dead fob battery before assuming a module fault, since a weak fob causes similar keyless symptoms.
- 3.Check the fuse feeding the RFA module and verify its power and ground.
- 4.Inspect the module's mounting area (trunk, under-seat, or behind trim) for water intrusion and corrosion.
- 5.Inspect the module connector and CAN/bus wiring for corrosion, looseness, chafing, breaks, and shorts.
- 6.If power, ground, and wiring are good but the module still won't communicate, replace and program it to the vehicle per the manufacturer procedure, including any key/fob relearn.
Repair cost
$80 – $900
Always rule out a dead fob battery first — that's a few dollars. A blown fuse, corroded ground, or connector repair runs $80-$250 plus $120-$250 diagnostic time. Repairing wiring or drying a water-intrusion path runs $150-$450. Replacing the RFA module runs $250-$900+ including programming and any key/fob relearn, which usually requires a manufacturer-level tool.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with module communication / can bus diagnosis preselected. Adjust labor rate and vehicle category to fit your situation.
DIY vs shop
This is an intermediate DIY job. It usually involves diagnostic steps, specialty parts, and some careful work in tight spaces. If you have the tools and a service manual or trustworthy video for your specific vehicle, it is achievable in a weekend. Otherwise, a competent independent shop will be faster.