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Home / DTC / U0591 — Invalid Data Received From Vehicle Control Module

U0591 — Invalid Data Received From Vehicle Control Module

Detailed page for trouble code U0591.

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U0591

Generic U — Network/User

Invalid Data Received From Vehicle Control Module

Brand: Generic
Type: U — Network/User
Views: UK: 0 EN: 3 RU: 1
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Page language: EN

Causes

  • Faulty or intermittent wiring/connectors on the vehicle communication bus
  • Poor or missing power or ground to one or more control modules
  • Failed or marginal CAN/LIN transceiver inside a control module
  • Incorrect or incompatible module software/calibration (recent reflash or replacement)
  • Network termination fault or high bus impedance (open/shorted termination resistors)
  • Electromagnetic interference or aftermarket device causing bus corruption

Symptoms

  • Malfunction Indicator Lamp (MIL) or multiple warning lamps illuminated
  • Loss or intermittent loss of function for the affected system(s)
  • Modules reporting communication errors or 'bus off' conditions
  • Stored communication DTCs in other modules (U0100 series, U0140, etc.)
  • Erratic behavior of vehicle functions controlled over the bus
  • No start or reduced drivability if critical module communication is lost

What to check

  • Use a scan tool to read all U-codes and related module codes and view freeze frame data
  • Note when the code sets (after key cycles, driving, during certain events)
  • Visually inspect connectors, pins and wiring for damage, corrosion, or loose terminals
  • Verify battery voltage and charging system health (stable 12–14.5 V during checks)
  • Check module power and ground circuits for proper voltage/continuity
  • Measure CAN/LIN bus voltages at several module connectors with key ON

Signal parameters

  • CAN bus idle voltages: CANH ≈ 2.5–3.5 V, CANL ≈ 1.5–2.5 V (vehicle-specific)
  • Dominant/recessive differential voltage around 2 V during active bits (depend on protocol)
  • Typical CAN bit rates: 125 kbps, 250 kbps, 500 kbps (verify vehicle-specific rate)
  • Normal bus termination: ~60 ohms between CANH and CANL (two 120Ω resistors in parallel)
  • LIN is typically single-wire serial with ~0–12 V signals referenced to ground (vehicle-specific)
  • Look for intermittent voltage spikes, missing recessive level, or stuck-dominant condition

Diagnostic algorithm

  1. Record all DTCs and freeze frame data from all control modules. Note related U-codes or B/C/P codes.
  2. Attempt to clear codes and re-run the failing conditions to verify reproducibility.
  3. Inspect physical wiring and connectors at the suspected source module(s) and at multiple points along the bus. Repair any damage found.
  4. Verify battery voltage and check grounds for proper continuity and tightness. Repair poor power/ground connections.
  5. With key ON, measure CANH/CANL voltages at several module connectors. Confirm idle voltages and termination resistance (~60 Ω).
  6. Use an oscilloscope to examine waveform quality on CAN lines while exercising communications to detect noise, reflections, or missing frames.
  7. If a specific source module is identified, unplug that module and see if the code changes or other modules report new communication errors (helps isolate the faulty unit).
  8. Check software/calibration levels for involved modules. If a recent reflash or module replacement occurred, verify correct programming and VIN alignment.
  9. Remove or disable any aftermarket electronics that interface with vehicle networks and retest.
  10. If physical layer and software are correct but invalid data persists, consider replacing the suspected faulty module per manufacturer guidance and reprogramming as required.
  11. After repairs, clear codes, verify communication stability, and perform a test drive to confirm the issue is resolved.

Likely causes

  • Loose/damaged connector at the module that sent the invalid data
  • Damaged wiring harness or chafed conductor on CAN high/low
  • Poor ground at chassis or module ground point causing noisy signals
  • Software mismatch after module replacement or partial reprogram
  • Failed CAN transceiver in either the sending or receiving module
  • Intermittent fault caused by vibration or corroded terminal

Fault status

⚠️ Status
One control module reports receiving invalid or corrupted data from another module on the vehicle communication network. Communication/data integrity problem detected — further diagnosis of wiring, module transceivers, and software is required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0073 U0121 U0140 U0193 U1000
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