U0498

Code

Generic U — Network/User

Invalid Data Received From Telephone Control Module

Brand: Generic

Type: U — Network/User

Views: UK: 33 EN: 31 RU: 30

AI status

Completed

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Page language: EN

Causes

Corrupt or malformed CAN/LIN message from the Telephone Control Module
Faulty Telephone Control Module (internal software or hardware fault)
Intermittent or low-voltage power/ground to the Telephone Control Module
Open, shorted, or intermittent wiring/connectors on the network or module harness
Network bus errors (improper termination, high bus load, noise, or a short)
Aftermarket infotainment or telematics devices interfering with bus data

Symptoms

Telephone/Bluetooth hands‑free features disabled or intermittent
Phone contacts or call logs not displayed or incorrect
Infotainment or telematics functions may show errors or reduced functionality
Other networked modules reporting related U‑codes or communication errors
Possible warning lights or message in instrument cluster about phone or telematics

What to check

Retrieve all stored network/communication DTCs and freeze frame with a factory-level scanner
Confirm battery voltage is within specification (engine off and cranking) during tests
Visually inspect telephone module connector(s) and harness for corrosion, bent pins, or water damage
Check for recent software updates, module replacements, or aftermarket installations
Scan bus traffic with a capable scan tool or CAN/LIN bus analyzer to capture messages from the telephone module
Verify termination resistors and measure CAN bus voltages/waveforms for noise or shorted lines

Signal parameters

Network type: CAN or LIN depending on vehicle (verify factory documentation for exact bus)
Typical CAN bus termination: 120 Ω (pair) between CAN High and CAN Low at rest (verify vehicle spec)
Expected CAN signal characteristics: stable differential waveform with identifiable message IDs and periodic packets from telephone module
Common baud rates: 250 kbps or 500 kbps for CAN; LIN commonly 19.2 kbps or defined by manufacturer
Message content: defined module CAN IDs, message frequency (often 1–20 Hz for status frames), and checksum/CRC where used
Look for malformed frames, incorrect length, invalid checksum, or unexpected ID values from the telephone module

Diagnostic algorithm

Connect a factory-level scan tool. Read and record all U‑codes and related module data. Note freeze frame or time stamp information.
Confirm code is current (not historical). If historical, attempt to reproduce by exercising phone/telematics functions.
Verify battery state of charge and system voltage. Repair any battery/charging problems before continuing.
Inspect connectors and harness at the telephone module for corrosion, water ingress, or damaged pins. Repair as needed.
With ignition on, monitor the vehicle network using a CAN/LIN bus analyzer or capable scan tool. Capture messages from the telephone module and check for correct IDs, packet length, timing, and checksum failures.
If malformed or no messages are present, trace wiring from the module to the gateway or bus backbone. Check continuity, shorts to ground/power, and connector integrity.
If bus errors or noise are present, isolate segments by disconnecting modules (one at a time) per factory procedure to locate the faulty device or short.
Check for and remove any aftermarket telematics/infotainment devices and retest.
Verify module software level and reflash/update using factory procedures if a software mismatch or known software bug exists.
If module is confirmed faulty after wiring and network checks, replace the Telephone Control Module and program/configure per manufacturer instructions.
Clear DTCs and perform a full functionality test, including multiple ignition cycles and real-world phone pairing/call tests to confirm repair.

Likely causes

Loose or corroded connector at the telephone/telematics module
Battery voltage low or unstable during module communication
Damaged CAN/LIN wiring between telephone module and gateway/module cluster
Failed or misprogrammed telephone control module after a recent update or replacement
Water intrusion or physical damage to the telephone module

Fault status

⚠️ Status

Invalid or corrupt data received from the Telephone Control Module. Communication/data integrity fault detected on the vehicle network involving the telephone/telematics device.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5 - 3.0 hours

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