U0470

Code

Generic U — Network/User

Invalid Data Received From Vehicle Communication Network

Brand: Generic

Type: U — Network/User

Views: UK: 11 EN: 25 RU: 16

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty module sending corrupted or out-of-spec messages
Intermittent or permanent wiring faults (shorts, opens, high resistance, corrosion)
Poor or intermittent power or ground to one or more modules
Bus termination issues (missing or incorrect resistors)
Bus voltage out of range or excessive electrical noise/interference
Software mismatch, corrupted firmware, or incompatible module programming

Symptoms

One or more vehicle systems inoperative or intermittent (e.g., instrument cluster, ABS, body systems)
Warning lights or multiple network/communication related DTCs present
Loss of data or stale values on scan tool for specific module(s)
Erratic or intermittent behavior of features controlled via the network
No communication with a specific module via the scan tool

What to check

Connect a capable diagnostic scanner; read all U-codes and related P/B/C codes and note freeze-frame or occurrence history
Check for recent service history (module replacements, software updates, aftermarket installations)
Visually inspect connectors and wiring for damage, corrosion, bent pins, or loose connections at modules on the bus
Check battery voltage and main power/ground distribution to affected modules
Measure CAN_H and CAN_L voltages with key ON, engine off (idle): expect ~2.5 V common-mode; dominant state ~CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V
Verify termination resistance across CAN_H to CAN_L ~60 ohms (two 120 Ω resistors in parallel) with key OFF

Signal parameters

CAN idle (recessive): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (common-mode)
CAN dominant: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ≈ 2 V)
Expected termination resistance across CAN_H & CAN_L (key off) ≈ 60 Ω ± 10%
Typical bus data rates: 125 kb/s, 250 kb/s, 500 kb/s or manufacturer-specific — verify correct bit-rate when analyzing traffic
Malformed message indicators: incorrect CRC/checksum, unexpected message length, invalid ID, or continuous error frames
LIN bus idle voltage near battery voltage; LIN faults often show as missing or incorrect single-wire frames

Diagnostic algorithm

Record all active and stored codes and freeze-frame data. Note when and how the code is set (startup, driving, specific action).
Attempt to clear codes and reproduce the fault. Determine if the code returns immediately or under specific conditions.
Inspect connectors, harnesses, and grounds for the modules on the affected network branch. Repair any physical damage.
Verify supply voltage and ground at each module node on the bus. Repair any power/ground issues before further testing.
Measure CAN_H/CAN_L voltages and termination resistance to confirm proper bus electrical characteristics.
Use an oscilloscope or bus analyzer to capture traffic while the code is set. Look for malformed frames, stuck nodes, or excessive error frames and identify source ID if possible.
Isolate the fault by disconnecting suspected modules or aftermarket devices one at a time (follow manufacturer procedure to avoid errors) and observe whether the code clears.
If a specific module is identified as transmitting invalid data, verify its software/calibration level and reflash/update per manufacturer service procedures before replacement.
Replace wiring, connectors, or module only after confirming the module is the source. After repair, clear codes and perform a full system check and road test to confirm repair.
If intermittent, consider extended vehicle-on testing or attaching a data logger to capture the event over time.

Likely causes

Failed or malfunctioning control module transmitting invalid frames
Damaged or corroded connector or wiring at a module on the affected bus
Missing/incorrect termination resistor or short to supply/ground on CAN high/low
Low battery/unstable power during module programming or operation
Recent module replacement with incorrect calibration or software

Fault status

⚠️ Status

Invalid data received on vehicle communication network. Message failed validation (format, length, checksum, source ID) or came from unexpected sender. Further investigation required to locate source of malformed frames or network electrical issue.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5-4 hours