Code
U1000
CITROEN
U — Network/User
Electric parking brake ECU not communicating fault: Not characterised
Views:
UK: 7
EN: 12
RU: 6
AI status
Completed
Completed
100%
Causes
- Loss of power or ground to the EPB ECU (blown fuse, disconnected/poor ground).
- Open or shorted CAN/bus wiring (damage, chafing, corrosion, pinched harness).
- Poor or corroded connector pins at the EPB ECU or gateway/module connectors.
- Network termination fault or missing termination resistor.
- Gateway/module or other ECU on the same bus is in a bus-off or error state.
- Software mismatch or corrupted ECU firmware preventing normal communication.
Symptoms
- Electric parking brake inoperative or cannot be released/applied via controls.
- Parking brake warning lamp or message on dash.
- Other body/control modules show communication faults or related warnings.
- Unable to access EPB ECU with diagnostic tool (no response).
- Intermittent operation of EPB (works sometimes, then disappears).
- Related features that rely on EPB status (hill assist, auto-hold) not available.
What to check
- Read all stored and pending DTCs across modules; note network and power-related codes.
- Check battery voltage at rest and with ignition on (should be ~12.2–13.8 V).
- Inspect fuses and relays supplying the EPB ECU (replace or test as required).
- Visually inspect EPB ECU connector for corrosion, bent pins, water ingress or damage.
- Verify good ground(s) for the EPB ECU and clean/tighten if required.
- Use a scan tool to attempt communication with the EPB ECU and other modules on same bus.
Signal parameters
- Battery supply to EPB ECU: nominal 11–14 V with ignition on; no large voltage drops during attempts.
- CAN bus idle voltages (typical): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V.
- CAN dominant bit voltages (typical): CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V when driven.
- Termination resistance across CAN H-L: approx. 60 Ω (two 120 Ω terminators in parallel).
- Expected ECU response: ECU should appear on the network and respond to diagnostic requests; if absent, no replies are returned.
Diagnostic algorithm
- Verify and record the code(s) present with a diagnostic tool. Check for related network codes in other modules.
- Confirm battery condition and terminal connections. Charge battery or connect stable 12 V supply if low.
- Inspect EPB ECU fuse(s) and relays; replace any blown fuses and retest communication.
- Visually inspect the EPB ECU connector and harness. Unplug and check male/female terminals for corrosion, pulled wires or bent pins.
- With ignition on, measure supply and ground at the EPB ECU connector (verify 11–14 V and good ground continuity).
- Measure CAN_H and CAN_L at the EPB ECU connector with ignition on and key ON (engine off). Confirm idle and dominant voltages and check for noise.
- Measure resistance between CAN_H and CAN_L with battery disconnected to check termination (should be ~60 Ω).
- Attempt to communicate with the EPB ECU using a capable diagnostic tester. Note if module appears, responds, or shows bus-off.
- If the EPB ECU is absent but other modules are present, trace CAN wiring back to the gateway/module and inspect connectors and junctions.
- If intermittent, perform wiggle tests on the harness while monitoring bus traffic and module presence to locate breaks.
- If wiring, connectors, fuses and gateway are verified good, consider reflashing or reprogramming the EPB ECU software per manufacturer procedure.
- Replace EPB ECU only after confirming external wiring, power, ground and bus integrity and after consulting OEM diagnostic procedures.
Likely causes
- Blown fuse or relay that supplies EPB ECU power.
- Broken or intermittent ground at nearby body/seat/boot grounds.
- Damaged CAN-H or CAN-L wires near hinge points (doors/boot) or where harness flexes.
- Corroded connector at EPB module (water ingress) or poor terminal contact.
- Bus termination resistor open or shorted (resistance not ~60 ohm).
- Gateway ECU (body control module) not forwarding or in bus-off state.
Fault status
Status
U1000 — EPB ECU not communicating on the vehicle data bus. The electric parking brake control module is not responding to diagnostic requests or network messages.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
U1000
DS
U — Network/User
Electric parking brake ECU not communicating fault: Not characterised
Views:
UK: 5
EN: 8
RU: 3
AI status
Completed
Completed
100%
Causes
- Loss of power or ground to the EPB ECU (blown fuse, disconnected/poor ground).
- Open or shorted CAN/bus wiring (damage, chafing, corrosion, pinched harness).
- Poor or corroded connector pins at the EPB ECU or gateway/module connectors.
- Network termination fault or missing termination resistor.
- Gateway/module or other ECU on the same bus is in a bus-off or error state.
- Software mismatch or corrupted ECU firmware preventing normal communication.
Symptoms
- Electric parking brake inoperative or cannot be released/applied via controls.
- Parking brake warning lamp or message on dash.
- Other body/control modules show communication faults or related warnings.
- Unable to access EPB ECU with diagnostic tool (no response).
- Intermittent operation of EPB (works sometimes, then disappears).
- Related features that rely on EPB status (hill assist, auto-hold) not available.
What to check
- Read all stored and pending DTCs across modules; note network and power-related codes.
- Check battery voltage at rest and with ignition on (should be ~12.2–13.8 V).
- Inspect fuses and relays supplying the EPB ECU (replace or test as required).
- Visually inspect EPB ECU connector for corrosion, bent pins, water ingress or damage.
- Verify good ground(s) for the EPB ECU and clean/tighten if required.
- Use a scan tool to attempt communication with the EPB ECU and other modules on same bus.
Signal parameters
- Battery supply to EPB ECU: nominal 11–14 V with ignition on; no large voltage drops during attempts.
- CAN bus idle voltages (typical): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V.
- CAN dominant bit voltages (typical): CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V when driven.
- Termination resistance across CAN H-L: approx. 60 Ω (two 120 Ω terminators in parallel).
- Expected ECU response: ECU should appear on the network and respond to diagnostic requests; if absent, no replies are returned.
Diagnostic algorithm
- Verify and record the code(s) present with a diagnostic tool. Check for related network codes in other modules.
- Confirm battery condition and terminal connections. Charge battery or connect stable 12 V supply if low.
- Inspect EPB ECU fuse(s) and relays; replace any blown fuses and retest communication.
- Visually inspect the EPB ECU connector and harness. Unplug and check male/female terminals for corrosion, pulled wires or bent pins.
- With ignition on, measure supply and ground at the EPB ECU connector (verify 11–14 V and good ground continuity).
- Measure CAN_H and CAN_L at the EPB ECU connector with ignition on and key ON (engine off). Confirm idle and dominant voltages and check for noise.
- Measure resistance between CAN_H and CAN_L with battery disconnected to check termination (should be ~60 Ω).
- Attempt to communicate with the EPB ECU using a capable diagnostic tester. Note if module appears, responds, or shows bus-off.
- If the EPB ECU is absent but other modules are present, trace CAN wiring back to the gateway/module and inspect connectors and junctions.
- If intermittent, perform wiggle tests on the harness while monitoring bus traffic and module presence to locate breaks.
- If wiring, connectors, fuses and gateway are verified good, consider reflashing or reprogramming the EPB ECU software per manufacturer procedure.
- Replace EPB ECU only after confirming external wiring, power, ground and bus integrity and after consulting OEM diagnostic procedures.
Likely causes
- Blown fuse or relay that supplies EPB ECU power.
- Broken or intermittent ground at nearby body/seat/boot grounds.
- Damaged CAN-H or CAN-L wires near hinge points (doors/boot) or where harness flexes.
- Corroded connector at EPB module (water ingress) or poor terminal contact.
- Bus termination resistor open or shorted (resistance not ~60 ohm).
- Gateway ECU (body control module) not forwarding or in bus-off state.
Fault status
Status
U1000 — EPB ECU not communicating on the vehicle data bus. The electric parking brake control module is not responding to diagnostic requests or network messages.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
U1000
Generic
U — Network/User
Manufacturer Controlled DTC
Views:
UK: 21
EN: 37
RU: 28
AI status
Completed
Completed
100%
Causes
- Loss of power or ground to the EPB ECU (blown fuse, disconnected/poor ground).
- Open or shorted CAN/bus wiring (damage, chafing, corrosion, pinched harness).
- Poor or corroded connector pins at the EPB ECU or gateway/module connectors.
- Network termination fault or missing termination resistor.
- Gateway/module or other ECU on the same bus is in a bus-off or error state.
- Software mismatch or corrupted ECU firmware preventing normal communication.
Symptoms
- Electric parking brake inoperative or cannot be released/applied via controls.
- Parking brake warning lamp or message on dash.
- Other body/control modules show communication faults or related warnings.
- Unable to access EPB ECU with diagnostic tool (no response).
- Intermittent operation of EPB (works sometimes, then disappears).
- Related features that rely on EPB status (hill assist, auto-hold) not available.
What to check
- Read all stored and pending DTCs across modules; note network and power-related codes.
- Check battery voltage at rest and with ignition on (should be ~12.2–13.8 V).
- Inspect fuses and relays supplying the EPB ECU (replace or test as required).
- Visually inspect EPB ECU connector for corrosion, bent pins, water ingress or damage.
- Verify good ground(s) for the EPB ECU and clean/tighten if required.
- Use a scan tool to attempt communication with the EPB ECU and other modules on same bus.
Signal parameters
- Battery supply to EPB ECU: nominal 11–14 V with ignition on; no large voltage drops during attempts.
- CAN bus idle voltages (typical): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V.
- CAN dominant bit voltages (typical): CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V when driven.
- Termination resistance across CAN H-L: approx. 60 Ω (two 120 Ω terminators in parallel).
- Expected ECU response: ECU should appear on the network and respond to diagnostic requests; if absent, no replies are returned.
Diagnostic algorithm
- Verify and record the code(s) present with a diagnostic tool. Check for related network codes in other modules.
- Confirm battery condition and terminal connections. Charge battery or connect stable 12 V supply if low.
- Inspect EPB ECU fuse(s) and relays; replace any blown fuses and retest communication.
- Visually inspect the EPB ECU connector and harness. Unplug and check male/female terminals for corrosion, pulled wires or bent pins.
- With ignition on, measure supply and ground at the EPB ECU connector (verify 11–14 V and good ground continuity).
- Measure CAN_H and CAN_L at the EPB ECU connector with ignition on and key ON (engine off). Confirm idle and dominant voltages and check for noise.
- Measure resistance between CAN_H and CAN_L with battery disconnected to check termination (should be ~60 Ω).
- Attempt to communicate with the EPB ECU using a capable diagnostic tester. Note if module appears, responds, or shows bus-off.
- If the EPB ECU is absent but other modules are present, trace CAN wiring back to the gateway/module and inspect connectors and junctions.
- If intermittent, perform wiggle tests on the harness while monitoring bus traffic and module presence to locate breaks.
- If wiring, connectors, fuses and gateway are verified good, consider reflashing or reprogramming the EPB ECU software per manufacturer procedure.
- Replace EPB ECU only after confirming external wiring, power, ground and bus integrity and after consulting OEM diagnostic procedures.
Likely causes
- Blown fuse or relay that supplies EPB ECU power.
- Broken or intermittent ground at nearby body/seat/boot grounds.
- Damaged CAN-H or CAN-L wires near hinge points (doors/boot) or where harness flexes.
- Corroded connector at EPB module (water ingress) or poor terminal contact.
- Bus termination resistor open or shorted (resistance not ~60 ohm).
- Gateway ECU (body control module) not forwarding or in bus-off state.
Fault status
Status
U1000 — EPB ECU not communicating on the vehicle data bus. The electric parking brake control module is not responding to diagnostic requests or network messages.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
U1000
HUMMER
U — Network/User
Class 2 Communication Malfunction
Views:
UK: 10
EN: 26
RU: 18
AI status
Completed
Completed
100%
Causes
- Loss of power or ground to the EPB ECU (blown fuse, disconnected/poor ground).
- Open or shorted CAN/bus wiring (damage, chafing, corrosion, pinched harness).
- Poor or corroded connector pins at the EPB ECU or gateway/module connectors.
- Network termination fault or missing termination resistor.
- Gateway/module or other ECU on the same bus is in a bus-off or error state.
- Software mismatch or corrupted ECU firmware preventing normal communication.
Symptoms
- Electric parking brake inoperative or cannot be released/applied via controls.
- Parking brake warning lamp or message on dash.
- Other body/control modules show communication faults or related warnings.
- Unable to access EPB ECU with diagnostic tool (no response).
- Intermittent operation of EPB (works sometimes, then disappears).
- Related features that rely on EPB status (hill assist, auto-hold) not available.
What to check
- Read all stored and pending DTCs across modules; note network and power-related codes.
- Check battery voltage at rest and with ignition on (should be ~12.2–13.8 V).
- Inspect fuses and relays supplying the EPB ECU (replace or test as required).
- Visually inspect EPB ECU connector for corrosion, bent pins, water ingress or damage.
- Verify good ground(s) for the EPB ECU and clean/tighten if required.
- Use a scan tool to attempt communication with the EPB ECU and other modules on same bus.
Signal parameters
- Battery supply to EPB ECU: nominal 11–14 V with ignition on; no large voltage drops during attempts.
- CAN bus idle voltages (typical): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V.
- CAN dominant bit voltages (typical): CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V when driven.
- Termination resistance across CAN H-L: approx. 60 Ω (two 120 Ω terminators in parallel).
- Expected ECU response: ECU should appear on the network and respond to diagnostic requests; if absent, no replies are returned.
Diagnostic algorithm
- Verify and record the code(s) present with a diagnostic tool. Check for related network codes in other modules.
- Confirm battery condition and terminal connections. Charge battery or connect stable 12 V supply if low.
- Inspect EPB ECU fuse(s) and relays; replace any blown fuses and retest communication.
- Visually inspect the EPB ECU connector and harness. Unplug and check male/female terminals for corrosion, pulled wires or bent pins.
- With ignition on, measure supply and ground at the EPB ECU connector (verify 11–14 V and good ground continuity).
- Measure CAN_H and CAN_L at the EPB ECU connector with ignition on and key ON (engine off). Confirm idle and dominant voltages and check for noise.
- Measure resistance between CAN_H and CAN_L with battery disconnected to check termination (should be ~60 Ω).
- Attempt to communicate with the EPB ECU using a capable diagnostic tester. Note if module appears, responds, or shows bus-off.
- If the EPB ECU is absent but other modules are present, trace CAN wiring back to the gateway/module and inspect connectors and junctions.
- If intermittent, perform wiggle tests on the harness while monitoring bus traffic and module presence to locate breaks.
- If wiring, connectors, fuses and gateway are verified good, consider reflashing or reprogramming the EPB ECU software per manufacturer procedure.
- Replace EPB ECU only after confirming external wiring, power, ground and bus integrity and after consulting OEM diagnostic procedures.
Likely causes
- Blown fuse or relay that supplies EPB ECU power.
- Broken or intermittent ground at nearby body/seat/boot grounds.
- Damaged CAN-H or CAN-L wires near hinge points (doors/boot) or where harness flexes.
- Corroded connector at EPB module (water ingress) or poor terminal contact.
- Bus termination resistor open or shorted (resistance not ~60 ohm).
- Gateway ECU (body control module) not forwarding or in bus-off state.
Fault status
Status
U1000 — EPB ECU not communicating on the vehicle data bus. The electric parking brake control module is not responding to diagnostic requests or network messages.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
U1000
HYUNDAI
U — Network/User
Head Unit ECM Error | TV Unit Error
Views:
UK: 15
EN: 27
RU: 24
AI status
Completed
Completed
100%
Causes
- Loss of power or ground to the EPB ECU (blown fuse, disconnected/poor ground).
- Open or shorted CAN/bus wiring (damage, chafing, corrosion, pinched harness).
- Poor or corroded connector pins at the EPB ECU or gateway/module connectors.
- Network termination fault or missing termination resistor.
- Gateway/module or other ECU on the same bus is in a bus-off or error state.
- Software mismatch or corrupted ECU firmware preventing normal communication.
Symptoms
- Electric parking brake inoperative or cannot be released/applied via controls.
- Parking brake warning lamp or message on dash.
- Other body/control modules show communication faults or related warnings.
- Unable to access EPB ECU with diagnostic tool (no response).
- Intermittent operation of EPB (works sometimes, then disappears).
- Related features that rely on EPB status (hill assist, auto-hold) not available.
What to check
- Read all stored and pending DTCs across modules; note network and power-related codes.
- Check battery voltage at rest and with ignition on (should be ~12.2–13.8 V).
- Inspect fuses and relays supplying the EPB ECU (replace or test as required).
- Visually inspect EPB ECU connector for corrosion, bent pins, water ingress or damage.
- Verify good ground(s) for the EPB ECU and clean/tighten if required.
- Use a scan tool to attempt communication with the EPB ECU and other modules on same bus.
Signal parameters
- Battery supply to EPB ECU: nominal 11–14 V with ignition on; no large voltage drops during attempts.
- CAN bus idle voltages (typical): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V.
- CAN dominant bit voltages (typical): CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V when driven.
- Termination resistance across CAN H-L: approx. 60 Ω (two 120 Ω terminators in parallel).
- Expected ECU response: ECU should appear on the network and respond to diagnostic requests; if absent, no replies are returned.
Diagnostic algorithm
- Verify and record the code(s) present with a diagnostic tool. Check for related network codes in other modules.
- Confirm battery condition and terminal connections. Charge battery or connect stable 12 V supply if low.
- Inspect EPB ECU fuse(s) and relays; replace any blown fuses and retest communication.
- Visually inspect the EPB ECU connector and harness. Unplug and check male/female terminals for corrosion, pulled wires or bent pins.
- With ignition on, measure supply and ground at the EPB ECU connector (verify 11–14 V and good ground continuity).
- Measure CAN_H and CAN_L at the EPB ECU connector with ignition on and key ON (engine off). Confirm idle and dominant voltages and check for noise.
- Measure resistance between CAN_H and CAN_L with battery disconnected to check termination (should be ~60 Ω).
- Attempt to communicate with the EPB ECU using a capable diagnostic tester. Note if module appears, responds, or shows bus-off.
- If the EPB ECU is absent but other modules are present, trace CAN wiring back to the gateway/module and inspect connectors and junctions.
- If intermittent, perform wiggle tests on the harness while monitoring bus traffic and module presence to locate breaks.
- If wiring, connectors, fuses and gateway are verified good, consider reflashing or reprogramming the EPB ECU software per manufacturer procedure.
- Replace EPB ECU only after confirming external wiring, power, ground and bus integrity and after consulting OEM diagnostic procedures.
Likely causes
- Blown fuse or relay that supplies EPB ECU power.
- Broken or intermittent ground at nearby body/seat/boot grounds.
- Damaged CAN-H or CAN-L wires near hinge points (doors/boot) or where harness flexes.
- Corroded connector at EPB module (water ingress) or poor terminal contact.
- Bus termination resistor open or shorted (resistance not ~60 ohm).
- Gateway ECU (body control module) not forwarding or in bus-off state.
Fault status
Status
U1000 — EPB ECU not communicating on the vehicle data bus. The electric parking brake control module is not responding to diagnostic requests or network messages.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
U1000
LAND ROVER
U — Network/User
Solid state driver - driver with disabilities
Views:
UK: 8
EN: 16
RU: 14
AI status
Completed
Completed
100%
Causes
- Loss of power or ground to the EPB ECU (blown fuse, disconnected/poor ground).
- Open or shorted CAN/bus wiring (damage, chafing, corrosion, pinched harness).
- Poor or corroded connector pins at the EPB ECU or gateway/module connectors.
- Network termination fault or missing termination resistor.
- Gateway/module or other ECU on the same bus is in a bus-off or error state.
- Software mismatch or corrupted ECU firmware preventing normal communication.
Symptoms
- Electric parking brake inoperative or cannot be released/applied via controls.
- Parking brake warning lamp or message on dash.
- Other body/control modules show communication faults or related warnings.
- Unable to access EPB ECU with diagnostic tool (no response).
- Intermittent operation of EPB (works sometimes, then disappears).
- Related features that rely on EPB status (hill assist, auto-hold) not available.
What to check
- Read all stored and pending DTCs across modules; note network and power-related codes.
- Check battery voltage at rest and with ignition on (should be ~12.2–13.8 V).
- Inspect fuses and relays supplying the EPB ECU (replace or test as required).
- Visually inspect EPB ECU connector for corrosion, bent pins, water ingress or damage.
- Verify good ground(s) for the EPB ECU and clean/tighten if required.
- Use a scan tool to attempt communication with the EPB ECU and other modules on same bus.
Signal parameters
- Battery supply to EPB ECU: nominal 11–14 V with ignition on; no large voltage drops during attempts.
- CAN bus idle voltages (typical): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V.
- CAN dominant bit voltages (typical): CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V when driven.
- Termination resistance across CAN H-L: approx. 60 Ω (two 120 Ω terminators in parallel).
- Expected ECU response: ECU should appear on the network and respond to diagnostic requests; if absent, no replies are returned.
Diagnostic algorithm
- Verify and record the code(s) present with a diagnostic tool. Check for related network codes in other modules.
- Confirm battery condition and terminal connections. Charge battery or connect stable 12 V supply if low.
- Inspect EPB ECU fuse(s) and relays; replace any blown fuses and retest communication.
- Visually inspect the EPB ECU connector and harness. Unplug and check male/female terminals for corrosion, pulled wires or bent pins.
- With ignition on, measure supply and ground at the EPB ECU connector (verify 11–14 V and good ground continuity).
- Measure CAN_H and CAN_L at the EPB ECU connector with ignition on and key ON (engine off). Confirm idle and dominant voltages and check for noise.
- Measure resistance between CAN_H and CAN_L with battery disconnected to check termination (should be ~60 Ω).
- Attempt to communicate with the EPB ECU using a capable diagnostic tester. Note if module appears, responds, or shows bus-off.
- If the EPB ECU is absent but other modules are present, trace CAN wiring back to the gateway/module and inspect connectors and junctions.
- If intermittent, perform wiggle tests on the harness while monitoring bus traffic and module presence to locate breaks.
- If wiring, connectors, fuses and gateway are verified good, consider reflashing or reprogramming the EPB ECU software per manufacturer procedure.
- Replace EPB ECU only after confirming external wiring, power, ground and bus integrity and after consulting OEM diagnostic procedures.
Likely causes
- Blown fuse or relay that supplies EPB ECU power.
- Broken or intermittent ground at nearby body/seat/boot grounds.
- Damaged CAN-H or CAN-L wires near hinge points (doors/boot) or where harness flexes.
- Corroded connector at EPB module (water ingress) or poor terminal contact.
- Bus termination resistor open or shorted (resistance not ~60 ohm).
- Gateway ECU (body control module) not forwarding or in bus-off state.
Fault status
Status
U1000 — EPB ECU not communicating on the vehicle data bus. The electric parking brake control module is not responding to diagnostic requests or network messages.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Repair manuals for LAND ROVER
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Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
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Code
U1000
Other
U — Network/User
SCP (J1850) Invalid or Missing Data for Primary Id
Views:
UK: 20
EN: 37
RU: 31
AI status
Completed
Completed
100%
Causes
- Loss of power or ground to the EPB ECU (blown fuse, disconnected/poor ground).
- Open or shorted CAN/bus wiring (damage, chafing, corrosion, pinched harness).
- Poor or corroded connector pins at the EPB ECU or gateway/module connectors.
- Network termination fault or missing termination resistor.
- Gateway/module or other ECU on the same bus is in a bus-off or error state.
- Software mismatch or corrupted ECU firmware preventing normal communication.
Symptoms
- Electric parking brake inoperative or cannot be released/applied via controls.
- Parking brake warning lamp or message on dash.
- Other body/control modules show communication faults or related warnings.
- Unable to access EPB ECU with diagnostic tool (no response).
- Intermittent operation of EPB (works sometimes, then disappears).
- Related features that rely on EPB status (hill assist, auto-hold) not available.
What to check
- Read all stored and pending DTCs across modules; note network and power-related codes.
- Check battery voltage at rest and with ignition on (should be ~12.2–13.8 V).
- Inspect fuses and relays supplying the EPB ECU (replace or test as required).
- Visually inspect EPB ECU connector for corrosion, bent pins, water ingress or damage.
- Verify good ground(s) for the EPB ECU and clean/tighten if required.
- Use a scan tool to attempt communication with the EPB ECU and other modules on same bus.
Signal parameters
- Battery supply to EPB ECU: nominal 11–14 V with ignition on; no large voltage drops during attempts.
- CAN bus idle voltages (typical): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V.
- CAN dominant bit voltages (typical): CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V when driven.
- Termination resistance across CAN H-L: approx. 60 Ω (two 120 Ω terminators in parallel).
- Expected ECU response: ECU should appear on the network and respond to diagnostic requests; if absent, no replies are returned.
Diagnostic algorithm
- Verify and record the code(s) present with a diagnostic tool. Check for related network codes in other modules.
- Confirm battery condition and terminal connections. Charge battery or connect stable 12 V supply if low.
- Inspect EPB ECU fuse(s) and relays; replace any blown fuses and retest communication.
- Visually inspect the EPB ECU connector and harness. Unplug and check male/female terminals for corrosion, pulled wires or bent pins.
- With ignition on, measure supply and ground at the EPB ECU connector (verify 11–14 V and good ground continuity).
- Measure CAN_H and CAN_L at the EPB ECU connector with ignition on and key ON (engine off). Confirm idle and dominant voltages and check for noise.
- Measure resistance between CAN_H and CAN_L with battery disconnected to check termination (should be ~60 Ω).
- Attempt to communicate with the EPB ECU using a capable diagnostic tester. Note if module appears, responds, or shows bus-off.
- If the EPB ECU is absent but other modules are present, trace CAN wiring back to the gateway/module and inspect connectors and junctions.
- If intermittent, perform wiggle tests on the harness while monitoring bus traffic and module presence to locate breaks.
- If wiring, connectors, fuses and gateway are verified good, consider reflashing or reprogramming the EPB ECU software per manufacturer procedure.
- Replace EPB ECU only after confirming external wiring, power, ground and bus integrity and after consulting OEM diagnostic procedures.
Likely causes
- Blown fuse or relay that supplies EPB ECU power.
- Broken or intermittent ground at nearby body/seat/boot grounds.
- Damaged CAN-H or CAN-L wires near hinge points (doors/boot) or where harness flexes.
- Corroded connector at EPB module (water ingress) or poor terminal contact.
- Bus termination resistor open or shorted (resistance not ~60 ohm).
- Gateway ECU (body control module) not forwarding or in bus-off state.
Fault status
Status
U1000 — EPB ECU not communicating on the vehicle data bus. The electric parking brake control module is not responding to diagnostic requests or network messages.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
U1000
PEUGEOT
U — Network/User
Electric parking brake ECU not communicating fault: Not characterised
Views:
UK: 6
EN: 11
RU: 6
AI status
Completed
Completed
100%
Causes
- Loss of power or ground to the EPB ECU (blown fuse, disconnected/poor ground).
- Open or shorted CAN/bus wiring (damage, chafing, corrosion, pinched harness).
- Poor or corroded connector pins at the EPB ECU or gateway/module connectors.
- Network termination fault or missing termination resistor.
- Gateway/module or other ECU on the same bus is in a bus-off or error state.
- Software mismatch or corrupted ECU firmware preventing normal communication.
Symptoms
- Electric parking brake inoperative or cannot be released/applied via controls.
- Parking brake warning lamp or message on dash.
- Other body/control modules show communication faults or related warnings.
- Unable to access EPB ECU with diagnostic tool (no response).
- Intermittent operation of EPB (works sometimes, then disappears).
- Related features that rely on EPB status (hill assist, auto-hold) not available.
What to check
- Read all stored and pending DTCs across modules; note network and power-related codes.
- Check battery voltage at rest and with ignition on (should be ~12.2–13.8 V).
- Inspect fuses and relays supplying the EPB ECU (replace or test as required).
- Visually inspect EPB ECU connector for corrosion, bent pins, water ingress or damage.
- Verify good ground(s) for the EPB ECU and clean/tighten if required.
- Use a scan tool to attempt communication with the EPB ECU and other modules on same bus.
Signal parameters
- Battery supply to EPB ECU: nominal 11–14 V with ignition on; no large voltage drops during attempts.
- CAN bus idle voltages (typical): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V.
- CAN dominant bit voltages (typical): CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V when driven.
- Termination resistance across CAN H-L: approx. 60 Ω (two 120 Ω terminators in parallel).
- Expected ECU response: ECU should appear on the network and respond to diagnostic requests; if absent, no replies are returned.
Diagnostic algorithm
- Verify and record the code(s) present with a diagnostic tool. Check for related network codes in other modules.
- Confirm battery condition and terminal connections. Charge battery or connect stable 12 V supply if low.
- Inspect EPB ECU fuse(s) and relays; replace any blown fuses and retest communication.
- Visually inspect the EPB ECU connector and harness. Unplug and check male/female terminals for corrosion, pulled wires or bent pins.
- With ignition on, measure supply and ground at the EPB ECU connector (verify 11–14 V and good ground continuity).
- Measure CAN_H and CAN_L at the EPB ECU connector with ignition on and key ON (engine off). Confirm idle and dominant voltages and check for noise.
- Measure resistance between CAN_H and CAN_L with battery disconnected to check termination (should be ~60 Ω).
- Attempt to communicate with the EPB ECU using a capable diagnostic tester. Note if module appears, responds, or shows bus-off.
- If the EPB ECU is absent but other modules are present, trace CAN wiring back to the gateway/module and inspect connectors and junctions.
- If intermittent, perform wiggle tests on the harness while monitoring bus traffic and module presence to locate breaks.
- If wiring, connectors, fuses and gateway are verified good, consider reflashing or reprogramming the EPB ECU software per manufacturer procedure.
- Replace EPB ECU only after confirming external wiring, power, ground and bus integrity and after consulting OEM diagnostic procedures.
Likely causes
- Blown fuse or relay that supplies EPB ECU power.
- Broken or intermittent ground at nearby body/seat/boot grounds.
- Damaged CAN-H or CAN-L wires near hinge points (doors/boot) or where harness flexes.
- Corroded connector at EPB module (water ingress) or poor terminal contact.
- Bus termination resistor open or shorted (resistance not ~60 ohm).
- Gateway ECU (body control module) not forwarding or in bus-off state.
Fault status
Status
U1000 — EPB ECU not communicating on the vehicle data bus. The electric parking brake control module is not responding to diagnostic requests or network messages.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Your experience will help others
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Was this AI description helpful?
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