Code
U0426
Generic
U — Network/User
Invalid Data Received From Vehicle Immobilizer Control Module
Views:
UK: 21
EN: 174
RU: 43
AI status
Completed
Completed
100%
Causes
- Faulty or misprogrammed immobilizer control module
- Corrupted or missing immobilizer messages on the CAN/LIN bus
- Poor power, ground, or intermittent wiring to the immobilizer module
- Damaged or corroded connectors or wiring between immobilizer and other modules
- Faulty or unprogrammed key/transponder or antenna ring
- Aftermarket alarm/remote start or module causing bus interference
Symptoms
- No-crank or no-start condition (starter disabled)
- Immobilizer/security or theft indicator lamp illuminated or flashing
- Intermittent starting or stalling
- Related modules showing communication or invalid data DTCs
- Reduced or altered vehicle functions (depending on vehicle strategy)
- Possible multiple modules reporting inconsistent data
What to check
- Use a scan tool to read freeze frame, all related DTCs, and module communication status
- Verify battery voltage is within specification and check for discharge or low-voltage events
- Inspect fuses, relays and power/ground circuits to the immobilizer module
- Visually inspect connectors and wiring for corrosion, damage, or poor seating
- Check for aftermarket alarm/remote start devices and disconnect for test
- Attempt to start using a known-good, programmed key or transponder
Signal parameters
- CAN bus: normal idle voltages ~2.5 V on CAN High and CAN Low (verify with manufacturer spec)
- Expected immobilizer message interval: typically 1–10 Hz (100–1000 ms) — verify presence of messages from immobilizer node
- Message payload: should include immobilizer status, key ID or authentication flags (values vary by manufacturer)
- Check for error frames, high error counters, or repeated malformed frames on the network
- Verify module supply voltage at terminal: typical battery voltage (12–14.5 V) and solid ground
Diagnostic algorithm
- Read and record all DTCs and freeze-frame data from all modules. Note related U-codes and B/C/P codes.
- Verify battery condition and restore/charge if low. Clear codes and attempt a controlled recreate of the fault.
- Inspect immobilizer module power, ground, fuses and connectors. Repair any poor connections.
- Check for aftermarket devices; disconnect them and retest.
- Use a scan tool to monitor immobilizer messages on the vehicle network. Confirm message IDs, frequency and payload integrity.
- If messages are missing or malformed, trace wiring between immobilizer and gateway/ECM. Repair breaks, shorts, or high resistance.
- Test immobilizer antenna and key/transponder recognition. Try a known-good, programmed key.
- If wiring and power are good but invalid data persists, consider reflashing or reprogramming the immobilizer and related control modules per OEM procedures.
- If reprogramming fails or module shows internal faults, replace the immobilizer control module and perform required module/key programming.
- After repairs, clear codes, perform functional tests, and verify no return of U0426 or related communication codes.
Likely causes
- CAN bus wiring fault (open, short to ground/B+, high resistance) between immobilizer and network
- Immobilizer module losing power or ground (fuse, relay, connector)
- Corrupted immobilizer module programming or EEPROM failure
- Interference from aftermarket electronics (alarm, remote starter)
- Faulty transponder/key preventing correct immobilizer state
Fault status
Status
Invalid Data Received From Vehicle Immobilizer Control Module
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
Similar codes
Workshop Manuals
Available brands with manuals
2
AUDI 11
6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)
Workshop ManualAudi A3 (1997) – 1.6L 4-cylinder (2‑valve) Engine Mechanical Components Service Manual (AEH, AKL, APF) – Edition 07.2002
Workshop ManualAUDI A3 (2004) Workshop Manual — 2.0L FSI Turbo (4‑cyl, 4‑valve) Engine, Mechanics — Edition 03.2017
Workshop ManualAudi A3 2004 — Electrical System (Workshop Manual, Edition 02.2018)
Workshop ManualAudi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007
Workshop ManualAudi A4 / A4 Cabriolet — Auxiliary Heater Workshop Manual (Edition 08.2004)
Workshop ManualAudi A4 / A4 Cabriolet (1.8T 4‑cyl turbo) — Motronic Injection & Ignition System Service Manual (Edition 01.2015)
Workshop ManualAudi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)
Workshop ManualAudi Q4 e-tron (Type F4) - Self-study Programme SSP 685
Workshop ManualAudi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)
Workshop ManualAudi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)
Workshop ManualLAND ROVER 3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
U0426
HYUNDAI
U — Network/User
Invalid Data Received From Vehicle Immobilizer Control Module
Views:
UK: 19
EN: 70
RU: 37
AI status
Completed
Completed
100%
Causes
- Faulty or misprogrammed immobilizer control module
- Corrupted or missing immobilizer messages on the CAN/LIN bus
- Poor power, ground, or intermittent wiring to the immobilizer module
- Damaged or corroded connectors or wiring between immobilizer and other modules
- Faulty or unprogrammed key/transponder or antenna ring
- Aftermarket alarm/remote start or module causing bus interference
Symptoms
- No-crank or no-start condition (starter disabled)
- Immobilizer/security or theft indicator lamp illuminated or flashing
- Intermittent starting or stalling
- Related modules showing communication or invalid data DTCs
- Reduced or altered vehicle functions (depending on vehicle strategy)
- Possible multiple modules reporting inconsistent data
What to check
- Use a scan tool to read freeze frame, all related DTCs, and module communication status
- Verify battery voltage is within specification and check for discharge or low-voltage events
- Inspect fuses, relays and power/ground circuits to the immobilizer module
- Visually inspect connectors and wiring for corrosion, damage, or poor seating
- Check for aftermarket alarm/remote start devices and disconnect for test
- Attempt to start using a known-good, programmed key or transponder
Signal parameters
- CAN bus: normal idle voltages ~2.5 V on CAN High and CAN Low (verify with manufacturer spec)
- Expected immobilizer message interval: typically 1–10 Hz (100–1000 ms) — verify presence of messages from immobilizer node
- Message payload: should include immobilizer status, key ID or authentication flags (values vary by manufacturer)
- Check for error frames, high error counters, or repeated malformed frames on the network
- Verify module supply voltage at terminal: typical battery voltage (12–14.5 V) and solid ground
Diagnostic algorithm
- Read and record all DTCs and freeze-frame data from all modules. Note related U-codes and B/C/P codes.
- Verify battery condition and restore/charge if low. Clear codes and attempt a controlled recreate of the fault.
- Inspect immobilizer module power, ground, fuses and connectors. Repair any poor connections.
- Check for aftermarket devices; disconnect them and retest.
- Use a scan tool to monitor immobilizer messages on the vehicle network. Confirm message IDs, frequency and payload integrity.
- If messages are missing or malformed, trace wiring between immobilizer and gateway/ECM. Repair breaks, shorts, or high resistance.
- Test immobilizer antenna and key/transponder recognition. Try a known-good, programmed key.
- If wiring and power are good but invalid data persists, consider reflashing or reprogramming the immobilizer and related control modules per OEM procedures.
- If reprogramming fails or module shows internal faults, replace the immobilizer control module and perform required module/key programming.
- After repairs, clear codes, perform functional tests, and verify no return of U0426 or related communication codes.
Likely causes
- CAN bus wiring fault (open, short to ground/B+, high resistance) between immobilizer and network
- Immobilizer module losing power or ground (fuse, relay, connector)
- Corrupted immobilizer module programming or EEPROM failure
- Interference from aftermarket electronics (alarm, remote starter)
- Faulty transponder/key preventing correct immobilizer state
Fault status
Status
Invalid Data Received From Vehicle Immobilizer Control Module
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
U0426
LAND ROVER
U — Network/User
Invalid data received from the immobilizer control module vehicle
Views:
UK: 7
EN: 48
RU: 22
AI status
Completed
Completed
100%
Causes
- Faulty or misprogrammed immobilizer control module
- Corrupted or missing immobilizer messages on the CAN/LIN bus
- Poor power, ground, or intermittent wiring to the immobilizer module
- Damaged or corroded connectors or wiring between immobilizer and other modules
- Faulty or unprogrammed key/transponder or antenna ring
- Aftermarket alarm/remote start or module causing bus interference
Symptoms
- No-crank or no-start condition (starter disabled)
- Immobilizer/security or theft indicator lamp illuminated or flashing
- Intermittent starting or stalling
- Related modules showing communication or invalid data DTCs
- Reduced or altered vehicle functions (depending on vehicle strategy)
- Possible multiple modules reporting inconsistent data
What to check
- Use a scan tool to read freeze frame, all related DTCs, and module communication status
- Verify battery voltage is within specification and check for discharge or low-voltage events
- Inspect fuses, relays and power/ground circuits to the immobilizer module
- Visually inspect connectors and wiring for corrosion, damage, or poor seating
- Check for aftermarket alarm/remote start devices and disconnect for test
- Attempt to start using a known-good, programmed key or transponder
Signal parameters
- CAN bus: normal idle voltages ~2.5 V on CAN High and CAN Low (verify with manufacturer spec)
- Expected immobilizer message interval: typically 1–10 Hz (100–1000 ms) — verify presence of messages from immobilizer node
- Message payload: should include immobilizer status, key ID or authentication flags (values vary by manufacturer)
- Check for error frames, high error counters, or repeated malformed frames on the network
- Verify module supply voltage at terminal: typical battery voltage (12–14.5 V) and solid ground
Diagnostic algorithm
- Read and record all DTCs and freeze-frame data from all modules. Note related U-codes and B/C/P codes.
- Verify battery condition and restore/charge if low. Clear codes and attempt a controlled recreate of the fault.
- Inspect immobilizer module power, ground, fuses and connectors. Repair any poor connections.
- Check for aftermarket devices; disconnect them and retest.
- Use a scan tool to monitor immobilizer messages on the vehicle network. Confirm message IDs, frequency and payload integrity.
- If messages are missing or malformed, trace wiring between immobilizer and gateway/ECM. Repair breaks, shorts, or high resistance.
- Test immobilizer antenna and key/transponder recognition. Try a known-good, programmed key.
- If wiring and power are good but invalid data persists, consider reflashing or reprogramming the immobilizer and related control modules per OEM procedures.
- If reprogramming fails or module shows internal faults, replace the immobilizer control module and perform required module/key programming.
- After repairs, clear codes, perform functional tests, and verify no return of U0426 or related communication codes.
Likely causes
- CAN bus wiring fault (open, short to ground/B+, high resistance) between immobilizer and network
- Immobilizer module losing power or ground (fuse, relay, connector)
- Corrupted immobilizer module programming or EEPROM failure
- Interference from aftermarket electronics (alarm, remote starter)
- Faulty transponder/key preventing correct immobilizer state
Fault status
Status
Invalid Data Received From Vehicle Immobilizer Control Module
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email