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Home / DTC / U2000 — Fault in reception of the main wake-up / triggering request information on the CAN: Absence of signal or data invalid

U2000 — Fault in reception of the main wake-up / triggering request information on the CAN: Absence of signal or data invalid

Detailed page for trouble code U2000.

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U2000

DS U — Network/User

Fault in reception of the main wake-up / triggering request information on the CAN: Absence of signal or data invalid

Brand: DS
Type: U — Network/User
Views: UK: 5 EN: 9 RU: 9
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Page language: EN

Causes

  • Missing or intermittent CAN wake-up message from the originating module
  • Physical wiring fault on CAN high/low between modules (open, short to ground or battery)
  • Failed CAN transceiver in originating or receiving module
  • Blown fuse or disabled power/ignition feed to the module that sends wake-up
  • Wrong bus termination or missing 120 Ω resistor
  • Low battery voltage or poor battery connections preventing proper wake-up signalling

Symptoms

  • Related modules do not wake or remain in sleep mode after unlock/ignition
  • Vehicle fails to respond to keyless entry, remote start, or wake commands
  • Intermittent or permanent loss of function for one or more CAN-controlled systems
  • Diagnostic tool reports missing message IDs or communication timeouts
  • Warning lights or multiple network-related fault codes present

What to check

  • Read and record all network-related DTCs and freeze-frame data with a diagnostic scanner
  • Verify battery voltage (resting and cranking) and battery connections
  • Check fuses and relays feeding the suspected originating module and gateway
  • Verify modules are present/responding on the scan tool (module list)
  • Observe CAN bus traffic on the scanner for the expected wake-up message or unusual traffic patterns
  • Measure CANH/CANL voltages with ignition off and on (recessive ~2.5 V, dominant levels differ)

Signal parameters

  • Typical CAN recessive idle voltage: both CANH and CANL ~2.5 V
  • Typical CAN dominant levels: CANH ≈ 3.5 V, CANL ≈ 1.5 V (values vary slightly by transceiver)
  • Bus termination: approximately 120 Ω between CANH and CANL (two 60 Ω in parallel at ends)
  • Common bus speeds: 250 kb/s or 500 kb/s (verify vehicle-specific bit rate)
  • Wake-up message: periodic or event-driven CAN frame (ID and period are manufacturer-specific)

Diagnostic algorithm

  1. Capture full network DTC report and note timestamps/conditions when U2000 set.
  2. Attempt to reproduce the fault by performing the event that should cause wake-up (unlock, key on, remote start) while monitoring the bus.
  3. Use a scan tool to watch for the specific wake-up message ID(s). If the message is absent, identify which module should transmit it from wiring diagrams or manufacturer data.
  4. Verify battery voltage (12.6 V+ resting). Charge battery or ensure good supply during diagnostics because low voltage can prevent messages.
  5. Check fuses/relays and power feeds to the suspected transmitting module; restore power if blown.
  6. Visually inspect and wiggle CAN connectors and harness sections between the transmitting module and gateway while observing bus traffic for interruptions.
  7. Measure CANH/CANL voltages at multiple points with ignition in relevant states (off, accessory, run). Compare to expected recessive/dominant levels.
  8. Measure termination resistance across CANH and CANL with battery disconnected — expect roughly 120 Ω; investigate if open or shorted.
  9. If messages are absent or corrupted, use an oscilloscope to view CAN waveforms and confirm signal integrity (rise/fall, reflections, noise).
  10. If a particular module is suspected, attempt module reset (clear codes) and re-test. If persistent and other nodes show healthy bus, consider replacing the module or its CAN transceiver after verifying wiring.
  11. After repair or repair candidate replacement, clear DTCs and verify operation across a full wake/sleep cycle and normal driving conditions.

Likely causes

  • Faulty module transceiver or module that sends the wake-up message
  • Open or high resistance in CAN wiring between originating module and gateway
  • Missing bus termination or short on CANH/CANL
  • Battery voltage below required threshold during wake event
  • Fuse or relay feeding the originating module is open

Fault status

⚠️ Status
No or invalid CAN wake-up/trigger message received — communication timeout for main wake request. Data missing or corrupted on CAN bus between sender and recipients.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

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