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U0214 — Lost Communication Remote Function Actuation Module

Generic OBD-II · all makesNetwork / communication

OBD-II code U0214 indicates that the vehicle's primary communication network (CAN bus) has lost communication with the Remote Function Actuation Module (RFA). This module typically controls keyless entry, remote start, or other auxiliary functions, and its loss may disable those features.

Symptoms

What causes it — most likely first

1. Faulty Remote Function Actuation Module (RFA)

Internal failure of the RFA module is the most common cause. This may result from water intrusion, electrical overload, or component degradation over time.

2. Open or short in CAN bus wiring to the RFA

Damaged, corroded, or disconnected wiring between the RFA and the CAN bus network can interrupt communication. Common failure points include harness connectors or chafed wires.

3. Poor electrical ground connection for the RFA

A weak or corroded ground can prevent the RFA from communicating properly. Grounds are often shared with other modules and may degrade over time.

4. Blown fuse or faulty relay supplying power to the RFA

Loss of power due to a blown fuse or failed relay will prevent the RFA from operating. Check the fuse box for the correct fuse and test relay operation.

5. CAN bus network issues (e.g., termination resistor failure)

A fault in the CAN bus network, such as a missing termination resistor or a short to power/ground, can disrupt communication with multiple modules, including the RFA.

6. Faulty Powertrain Control Module (PCM) or Body Control Module (BCM)

While rare, a failure in the PCM or BCM that manages the CAN bus network could cause communication loss. This is typically a last-resort diagnosis after all other causes are ruled out.

How it's diagnosed

  1. Verify the code using a scan tool and check for related communication codes (e.g., U-codes for other modules).
  2. Inspect the RFA module and its connectors for physical damage, corrosion, or loose connections. Ensure the module is securely mounted.
  3. Test power and ground circuits to the RFA using a multimeter. Confirm the module is receiving proper voltage and has a solid ground.
  4. Check CAN bus wiring for continuity and shorts. Use a scope or CAN bus analyzer to verify signal integrity between the RFA and the network.
  5. Inspect fuses and relays supplying power to the RFA. Replace any blown fuses or faulty relays and retest.
  6. If all other causes are ruled out, test the RFA module itself (e.g., substitution or bench testing) or consider network-level issues like termination resistors.

Code facts & related codes

SystemNetwork / communication
StandardizationSAE generic — identical on every make
Related codesU0210 — Lost Communication Seat Control ModuleU0211 — Lost Communication Seat Control ModuleU0212 — Lost Communication Steering Column ConU0213 — Lost Communication Mirror Control ModuU0215 — Lost Communication Door SwitchU0216 — Lost Communication Door Switch B

Frequently asked

Is the PCM usually the cause of U0214?

No. The PCM is rarely the cause of U0214. This code almost always points to a fault in the Remote Function Actuation Module itself, its wiring, or power supply. Replace the PCM only after all other possibilities are exhausted.

Can I drive with U0214 set?

Yes, in most cases. U0214 typically disables auxiliary functions like remote start or keyless entry but does not affect core drivability. However, diagnose and repair the issue promptly to restore full functionality.

Why does my scan tool show no communication with the RFA?

If the scan tool cannot communicate with the RFA, the module may be powered off, disconnected, or internally failed. Check power, ground, and wiring before assuming the module is faulty.

Can a weak battery cause U0214?

A weak or failing battery can sometimes cause intermittent communication issues, but it is unlikely to set U0214 specifically. Test the battery and charging system if other electrical issues are present.