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Home / DTC / U0128 — Lost message from electronic parking brake with ignition off or in the accessory position

U0128 — Lost message from electronic parking brake with ignition off or in the accessory position

Detailed page for trouble code U0128.

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U0128

LAND ROVER U — Network/User

Lost message from electronic parking brake with ignition off or in the accessory position

Brand: LAND ROVER
Type: U — Network/User
Views: UK: 9 EN: 82 RU: 12
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Page language: EN

Causes

  • EPB module asleep or intentionally powered down (normal condition) but control module still expects messages
  • Low battery voltage or poor battery condition preventing module wake or network polling
  • Faulty power supply or ground to the EPB module (open/poor connection)
  • Corroded/damaged connector or wiring to the EPB module
  • CAN bus wiring short to battery, short to ground, or open circuit
  • Failed EPB module or internal electronics

Symptoms

  • Stored U0128 code in control module history (may be one of several network codes)
  • Possible EPB warning light or message if module truly offline when ignition ON
  • Intermittent or no EPB remote/automatic parking brake operation
  • Other modules showing lost communication or related U-codes
  • Often no noticeable symptom while vehicle is off (code logged during sleep/wake)

What to check

  • Verify exact code and freeze-frame/recorded conditions with a capable scan tool
  • Check battery state-of-charge and resting voltage (verify good battery and charging system)
  • Inspect EPB module fuses and relays; verify ignition/accessory power circuits
  • Visually inspect connectors and wiring at the EPB module for corrosion, damage, or loose pins
  • Scan the CAN network for presence of the EPB module and other nodes; note any other U-codes
  • Check for proper CAN bus termination resistance (≈60 ohms across CAN_H to CAN_L)

Signal parameters

  • CAN bus recessive (idle) voltage: approximately 2.5 V on CAN_H and CAN_L (both near mid-rail) when idle
  • CAN bus dominant levels (when active): CAN_H ~3.5 V and CAN_L ~1.5 V (values vary by vehicle)
  • Termination resistance: ~60 ohms measured between CAN_H and CAN_L with key off or on (two 120Ω in parallel)
  • Battery/resting voltage: ~12.0–12.8 V with ignition off; lower voltages can prevent module wake
  • When woken by scan tool: module should start communicating on bus and appear in network node list

Diagnostic algorithm

  1. Confirm the code U0128 and check for other network-related DTCs. Record freeze frame and event data.
  2. Check battery voltage and charge if below recommended level. Ensure battery connections are clean and tight.
  3. Inspect EPB module connector and wiring for damage, corrosion, rodent damage, or water ingress. Repair any faults.
  4. Verify fuses/relays feeding the EPB module and confirm ignition/accessory power is present when expected.
  5. With a scan tool, attempt to communicate with the EPB module. If it does not respond, try wake-up via the tool and observe behavior.
  6. Measure CAN_H and CAN_L voltages at the EPB connector in Off, Accessory and On positions. Compare to expected values and other nodes on the bus.
  7. Check termination resistance between CAN_H and CAN_L at multiple points on the network. Look for open or incorrect termination.
  8. If CAN voltages are abnormal, isolate wiring sections to find short/open: disconnect modules one at a time to see when bus returns to normal.
  9. Verify module power and ground continuity to chassis and battery. Repair poor grounds or power feeds.
  10. If wiring and power are good but the module still does not communicate, consider software/gateway issues: check for required module updates or reprogramming and consult manufacturer bulletins.
  11. If module is confirmed faulty (non-responsive with correct power, ground and bus), replace EPB module and re-initialize or program as required. Clear codes and retest.

Likely causes

  • Battery voltage low or battery disconnected recently causing modules to sleep/not wake
  • Poor ground or corroded connector at EPB module
  • CAN_H or CAN_L open/short or poor splice along bus
  • Faulty ignition switch or accessory circuit not providing proper wake
  • Faulty EPB module or gateway failing to re-establish communication after sleep

Fault status

⚠️ Status
Lost message from the Electronic Parking Brake (EPB) module detected when ignition is off or in accessory position — communication on the vehicle CAN bus not received by other control modules.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3.0 hours

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U0100 U0101 U0121 U0140 U0155 U0126
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