U1710

Code

Generic U — Network/User

Control Module Communication Error — Invalid Data Received

Brand: Generic

Type: U — Network/User

Views: UK: 26 EN: 32 RU: 22

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty transmitting module (software bug, failing transceiver)
Damaged wiring, poor connector contact, corrosion or bent pins on CAN/CVT/other bus lines
Short or open on CAN High/CAN Low or supply/ground to a module
Missing or incorrect termination resistor(s) or incorrect bus topology
Excessive electromagnetic interference (EMI) or voltage spikes
Multiple modules transmitting same ID or bus arbitration faults

Symptoms

MIL/Warning lamp illuminated
Loss, degradation or intermittent operation of systems that use the affected messages (e.g., ABS, transmission, instrument cluster)
Intermittent faults or modules going to bus-off state
Erratic gauge readings or strange instrument cluster messages
Stored freeze frame or other network-related DTCs present

What to check

Read all stored DTCs and freeze frame data from all modules; note frequency and conditions
Scan for related U-codes and module reported error counters (bus-off, transmit/receive errors)
Visually inspect connectors and wiring for damage, corrosion, or water intrusion
Check battery voltage and ground integrity; ensure stable supply during test
Measure CAN bus idle voltages at a known-good connector with key-on (CAN_H ≈2.5 V, CAN_L ≈2.5 V)
Measure total bus termination resistance (≈60 ohms across CAN_H and CAN_L) with key off

Signal parameters

CAN bus idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (key ON)
CAN dominant state voltages: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (approx. 2.0 V differential)
Bus differential voltage during idle: ≈0 V; during dominant: ≈2.0 V
Total bus termination: ≈60 ohms (two 120 Ω in parallel) across CAN_H–CAN_L
Message rate and ID: expected frequency and CAN ID(s) for the affected message(s)
DLC (data length), checksum/CRC field and timestamp consistency for suspect messages

Diagnostic algorithm

Retrieve and record DTCs, freeze frame, and module status from all networked modules; note when code sets and any related codes.
Identify which module reported U1710 and which message ID/payload failed (if stored). Check for other modules reporting errors or going bus-off.
Perform visual inspection of the network wiring, connectors, grounds, and power feeds for the affected modules; repair any damage.
Verify battery voltage and charge state; ensure stable power during testing.
Check bus termination resistance with key off (~60 Ω across CAN_H and CAN_L). Repair/add termination if incorrect.
Measure idle voltages at a known-good connector (CAN_H and CAN_L ≈2.5 V). Investigate if voltages are out of range.
Use an oscilloscope or CAN analyzer to capture waveforms and frames while reproducing the fault; look for malformed frames, spikes, reflections, or message collisions.
Isolate the fault by disconnecting suspect nodes one at a time (with ignition in appropriate state) while monitoring the bus to identify which node introduces invalid data.
If a specific module is identified, check its software/calibration level and update/reflash if a known fix exists; clear codes and retest.
Replace a failing transceiver or faulty module only after confirming isolation and re-running network tests; reassemble and verify no recurrence.

Likely causes

Loose, corroded or damaged connector/pin on CAN or module harness
Faulty CAN transceiver on transmitting or receiving module
Missing/incorrect termination or bus wiring fault causing corruption
Software/firmware mismatch causing malformed messages

Fault status

⚠️ Status

Control module detected invalid or malformed data on the vehicle network (invalid message format, checksum/CRC failure, or unexpected payload). Intermittent or persistent communication corruption may be present.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5-4.0 hours