Code
U0417
Generic
U — Network/User
Invalid Data Received From Park Brake Control Module
AI status
Completed
Completed
100%
Causes
- Faulty Park Brake Control Module (EPB module) producing corrupted messages
- Intermittent or open/short on CAN bus wiring between modules
- Poor power or ground at the Park Brake Control Module
- Connector corrosion, bent pins, or water intrusion at the EPB module
- Software mismatch, corrupted firmware, or incorrect module programming
- Low battery voltage or voltage spikes during communication
Symptoms
- Parking brake warning lamp or EPB fault message in the instrument cluster
- Inability to apply or release the electronic parking brake
- Related ABS/traction/parking interlock warnings or reduced functionality
- Stored U0417 and possibly other CAN/communication DTCs
- Possible inability to shift out of Park (electronic interlock) on some vehicles
What to check
- Read and record all stored DTCs and freeze frame data with a capable scan tool
- Check battery voltage (key on, engine off and cranking) and verify stable supply
- Inspect connectors, pins, and wiring at the Park Brake Control Module for corrosion, damage, or loose terminals
- Verify fuses and relays powering the park brake module
- Use a scan tool or CAN bus monitor to confirm the EPB module is sending alive messages and correct status messages
- Perform a wiggle test on wiring and connectors while watching bus traffic for drops or errors
Signal parameters
- CAN bus alive/status message from Park Brake Module: present at expected interval (typical 50–200 ms)
- Message contents: park brake status bit (applied/released), error/status flags, and alive counter (not changing indicates stale data)
- Bus voltage: nominal 12 V (vehicle off) to ~14 V (engine running) with minimal drop during communication
- Module supply and ground: stable reference voltage at power pin and low resistance ground to chassis
- Response time: module should respond to diagnostic requests within expected timeout (usually
- No excessive CAN bus error frames or high bit error count on data analyzer
Diagnostic algorithm
- Connect a full-function scan tool. Record U0417 and any other DTCs, and capture freeze frame/data parameters relating to park brake status, bus errors, and module addresses.
- Verify vehicle battery voltage (key on) and check charging system if voltage is low or unstable. Recharge/replace battery if necessary and retest.
- Visually inspect EPB module connector and harness for corrosion, water intrusion, broken wires, or damaged pins. Repair as required.
- Verify power and ground at the EPB module with a DVOM. Check fuses and related power/ignition feed circuits. Repair open/short or high resistance grounds.
- Use a scan tool or CAN bus diagnostic tool to confirm the EPB module is present on the network and transmitting expected messages. Note message frequency, alive counter, and status bytes.
- Perform a wiggle test on the EPB harness while monitoring CAN traffic for dropped messages or error frames. Repair any wiring faults found.
Likely causes
- CAN bus communication problem (open, short to battery/ground, or excessive resistance)
- Loose or corroded connector/pin at the park brake module
- Park Brake Control Module failure or internal software corruption
- Power/ground fault at the module (fuse, wiring, or poor chassis ground)
Fault status
Status
Invalid data received from Park Brake Control Module — corrupted or inconsistent CAN/diagnostic data from the EPB module.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
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