U2003

Code

PEUGEOT U — Network/User

Main wake-up not coherent / controlled main triggering request information coherence fault

Brand: PEUGEOT

Type: U — Network/User

Views: UK: 3 EN: 5 RU: 5

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Page language: EN

Low or unstable battery voltage
Faulty or intermittent ignition/accessory supply (IGN/ACC/MAIN power rail)
Poor ground or corroded connectors on modules involved in wake/sleep
CAN/LIN bus communication errors or high bus error rate
Faulty Body Control Module (BCM), gateway or other network node sending incorrect wake requests
Incorrect vehicle configuration or module coding after replacement or software mismatch

Vehicle does not wake reliably from sleep (no response to key or remote)
Unexpected shutdown or failure to engage accessories when ignition turned on
Intermittent starting problems or starter not engaging
Multiple modules showing wake/sleep related faults or communication errors on a scanner
Parasitic battery drain or modules staying awake longer than expected
Warning lights or reduced functionality of convenience features

Check battery voltage and state of charge (resting voltage and cranking voltage) and battery terminals for corrosion/tightness
Use a diagnostic scan tool to read live module status: which modules report IGN/MAIN/wake state and timestamps
Read fault memory in BCM/gateway and other modules for related network/wake errors
Visually inspect harnesses and connectors for BCM, gateway, ignition switch, fusebox and relevant grounds
Measure presence and continuity of IGN/MAIN accessory power rails at the ignition switch, fusebox and BCM
Check CAN/LIN bus physical layer: bus voltages, resistance, and for short to power/ground using oscilloscope if available

Battery resting voltage (V)
Cranking voltage (V)
IGN / ACC / MAIN 12V supply presence (ON/OFF) at key positions
CAN bus dominant voltages (CAN_H ~2.5V idle, CAN_L ~2.5V idle) and differential amplitude (approx 2V)
Bus error counters / fault counters from gateway/BCM via scanner
Module wake request flags or internal "awake" state reported by BCM/gateway

Verify and charge battery to specification; retest with good battery and known-good ground connections
Connect diagnostic tool and record which modules are awake/asleep and any stored U-/B- codes; note timestamps and sequence
Clear codes, perform controlled wake/sleep cycles (key off, open/close doors, remote lock/unlock) and observe which event generates the fault
Measure ignition/main supply voltages and continuity from ignition switch to BCM/gateway and fusebox; repair any wiring issues
Inspect and test main grounds related to BCM and gateway; clean/tighten as necessary
Check CAN bus physical layer: measure idle voltages and differential signal during wake attempt; look for noise or a node driving bus incorrectly. Temporarily disconnect suspected module(s) one at a time to see if fault clears
If a replaced module or reprogramming was done recently, verify correct software version and coding; reflash or reconfigure per manufacturer service information
If after isolating wiring and confirming software the fault persists, consider replacing the gateway/BCM only after confirming with manufacturer diagnostic procedures

⚠️ Status

Main wake-up states reported by network nodes are inconsistent; controlled main triggering request information coherence fault detected.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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