Code
U1073
LAND ROVER
U — Network/User
SCP (J1850) invalid or missing data for the cooling engine
Views:
UK: 18
EN: 24
RU: 23
AI status
Completed
Completed
100%
Causes
- Open, short, or high-resistance wiring on the SCP/J1850 bus associated with the cooling module
- Corroded, loose or water-damaged connector at the cooling module, ECM/BCM, or gateway module
- Cooling module (fan module/fan control unit) power or ground fault
- Failed cooling module (internal electronics or transceiver)
- Failed engine control module (ECM) or body control module (BCM) gateway that relays cooling data
- Network bus termination fault or excessive electrical noise on the SCP/J1850 line
Symptoms
- Cooling fan does not operate or operates intermittently
- Engine runs hotter than normal or may overheat under load
- Dash warnings related to engine temperature or fan fault
- Reduced A/C cooling performance at low speeds
- Scanner shows U1073 and possibly other network communication codes
- No live data for coolant temperature or fan status from the expected module
What to check
- Connect a factory-level diagnostic tool and read all network/U-codes and freeze-frame data
- Check for related codes (ECM, BCM, fan module) and note time stamps
- Visually inspect connectors and harnesses for corrosion, damage, or water ingress
- Verify battery voltage and charge state; perform basic power/ground checks at the cooling module
- Backprobe the module connector and verify supply voltage and ground integrity
- Use an oscilloscope or lab scope to observe the SCP/J1850 physical layer for messages and noise
Signal parameters
- Network type: SCP (Land Rover implementation of J1850 / message-based serial bus)
- Physical layer: single-wire message bus (nominal voltages around 0–5 V depending on dominant/recessive states) — use scope for verification
- Typical message contents: coolant temp, fan status/commands, fan speed requests, diagnostic/status flags
- Message behavior: periodic status broadcasts and on-demand commands; missing or garbled frames indicate a bus fault
- Common fault signatures: bus stuck high/low, excessive noise, missing periodic packets, invalid frame checksums
Diagnostic algorithm
- Retrieve all stored and pending codes with a capable scan tool and record freeze-frame/live-data related to cooling circuit.
- Check for other communication codes (gateway/ECM/BCM). Address any higher-priority module-power or bus-off conditions first.
- Visually inspect wiring and connectors at the cooling module, ECM and gateway for corrosion, bent pins, water intrusion or mechanical damage.
- Verify power and ground at the cooling module connector with the connector mated and ignition on (measure battery voltage and continuity to chassis ground).
- Monitor live data: confirm coolant temperature and fan status values — if data absent or invalid, note which module is the source.
- Use an oscilloscope to view the SCP/J1850 bus at the module connector and at the gateway/ECM to verify proper message activity and signal integrity (check for stuck-high/low, missing frames, noise).
- Perform a wiggle test of the harness while observing live data or scope to find intermittent wiring faults.
- If physical-layer signals are good at one module but absent at another, trace wiring and check intermediate connectors/terminals; repair damaged wiring or connectors.
- If wiring and power/ground are confirmed good and the bus shows valid traffic to other modules, suspect the cooling module; consult OEM procedures for bench testing or replacement.
- After repairs, clear codes, re-run diagnostics and road-test to confirm cooling messages are present and the symptom is resolved. If intermittent, perform extended monitoring.
Likely causes
- Damaged connector or wiring to the fan control module
- Cooling fan control module failure or its internal communication transceiver
- Loss of power or poor ground to the cooling module
- Corrosion or water intrusion at a connector on the J1850/SCP wiring harness
- Gateway/module refusing or not forwarding cooling messages due to a fault or software issue
Fault status
Status
U1073 — SCP (J1850) invalid or missing data for engine cooling. Communication fault between cooling module and vehicle network; check wiring, power/ground, connectors and module.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
Similar codes
Repair manuals
Manual library for LAND ROVER
160
Browse 160 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
LAND ROVER
-
LAND ROVER: 2023
-
Range Rover Velar
-
-
LAND ROVER: 2022
-
Discovery Sport
-
Range Rover
- Autobiography, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover Autobiography
- 2022 Range Rover Base
- First Edition
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover HSE Westminster
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover SE
- SE, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover SE
- SV
- SVAutobiography
- SVAutobiography Dynamic
- SVAutobiography Dynamic Blk.
-
Range Rover Evoque
-
Range Rover Sport
-
Range Rover Velar
-
LAND ROVER: 2021
-
Discovery Sport
-
Range Rover
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Autobiography
- Autobiography Fifty Edition
- 2021 Range Rover Base
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover HSE
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover HSE Westminster
- SVAutobiography
- SVAutobiography Dynamic
- SVAutobiography Dynamic Blk.
-
Range Rover Evoque
-
Range Rover Sport
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography Dynamic
- HSE Dynamic
- HSE Silver Edition, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Sport HSE Silver Edition
- HST
- SE
- SVR
- SVR Carbon Edition
-
Range Rover Velar
-
LAND ROVER: 2020
-
Discovery
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE
- HSE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE
- HSE Luxury, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE Luxury
- HSE Luxury, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE Luxury
- Landmark
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery SE
- SE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery SE
-
Discovery Sport
-
Range Rover
- Autobiography
- Base, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Base
- Base, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Base
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover HSE
- SVAutobiography
- SVAutobiography Dynamic
-
Range Rover Evoque
-
Range Rover Sport
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport Autobiography Dynamic
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport HSE
- HSE Dynamic
- HSE PHEV
- HST
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport SE
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport SE
- SVR
-
Range Rover Velar
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar R-Dynamic S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar S
- S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar S
- SVAutobiography Dyn.
-
LAND ROVER: 2019
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
U1073
MITSUBISHI
U — Network/User
Bus-Off
Views:
UK: 22
EN: 26
RU: 21
AI status
Completed
Completed
100%
Causes
- Open, short, or high-resistance wiring on the SCP/J1850 bus associated with the cooling module
- Corroded, loose or water-damaged connector at the cooling module, ECM/BCM, or gateway module
- Cooling module (fan module/fan control unit) power or ground fault
- Failed cooling module (internal electronics or transceiver)
- Failed engine control module (ECM) or body control module (BCM) gateway that relays cooling data
- Network bus termination fault or excessive electrical noise on the SCP/J1850 line
Symptoms
- Cooling fan does not operate or operates intermittently
- Engine runs hotter than normal or may overheat under load
- Dash warnings related to engine temperature or fan fault
- Reduced A/C cooling performance at low speeds
- Scanner shows U1073 and possibly other network communication codes
- No live data for coolant temperature or fan status from the expected module
What to check
- Connect a factory-level diagnostic tool and read all network/U-codes and freeze-frame data
- Check for related codes (ECM, BCM, fan module) and note time stamps
- Visually inspect connectors and harnesses for corrosion, damage, or water ingress
- Verify battery voltage and charge state; perform basic power/ground checks at the cooling module
- Backprobe the module connector and verify supply voltage and ground integrity
- Use an oscilloscope or lab scope to observe the SCP/J1850 physical layer for messages and noise
Signal parameters
- Network type: SCP (Land Rover implementation of J1850 / message-based serial bus)
- Physical layer: single-wire message bus (nominal voltages around 0–5 V depending on dominant/recessive states) — use scope for verification
- Typical message contents: coolant temp, fan status/commands, fan speed requests, diagnostic/status flags
- Message behavior: periodic status broadcasts and on-demand commands; missing or garbled frames indicate a bus fault
- Common fault signatures: bus stuck high/low, excessive noise, missing periodic packets, invalid frame checksums
Diagnostic algorithm
- Retrieve all stored and pending codes with a capable scan tool and record freeze-frame/live-data related to cooling circuit.
- Check for other communication codes (gateway/ECM/BCM). Address any higher-priority module-power or bus-off conditions first.
- Visually inspect wiring and connectors at the cooling module, ECM and gateway for corrosion, bent pins, water intrusion or mechanical damage.
- Verify power and ground at the cooling module connector with the connector mated and ignition on (measure battery voltage and continuity to chassis ground).
- Monitor live data: confirm coolant temperature and fan status values — if data absent or invalid, note which module is the source.
- Use an oscilloscope to view the SCP/J1850 bus at the module connector and at the gateway/ECM to verify proper message activity and signal integrity (check for stuck-high/low, missing frames, noise).
- Perform a wiggle test of the harness while observing live data or scope to find intermittent wiring faults.
- If physical-layer signals are good at one module but absent at another, trace wiring and check intermediate connectors/terminals; repair damaged wiring or connectors.
- If wiring and power/ground are confirmed good and the bus shows valid traffic to other modules, suspect the cooling module; consult OEM procedures for bench testing or replacement.
- After repairs, clear codes, re-run diagnostics and road-test to confirm cooling messages are present and the symptom is resolved. If intermittent, perform extended monitoring.
Likely causes
- Damaged connector or wiring to the fan control module
- Cooling fan control module failure or its internal communication transceiver
- Loss of power or poor ground to the cooling module
- Corrosion or water intrusion at a connector on the J1850/SCP wiring harness
- Gateway/module refusing or not forwarding cooling messages due to a fault or software issue
Fault status
Status
U1073 — SCP (J1850) invalid or missing data for engine cooling. Communication fault between cooling module and vehicle network; check wiring, power/ground, connectors and module.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
Similar codes
Repair manuals
Manual library for MITSUBISHI
203
Browse 203 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
MITSUBISHI
-
MITSUBISHI: 2024
-
Outlander PHEV
-
MITSUBISHI: 2023
-
Mirage
-
Mirage G4
-
Outlander PHEV
-
MITSUBISHI: 2022
-
MITSUBISHI: 2021
-
MITSUBISHI: 2020
-
Mirage G4
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
U1073
Other
U — Network/User
SCP (J1850) Invalid or Missing Data for Engine Coolant
Views:
UK: 25
EN: 39
RU: 30
AI status
Completed
Completed
100%
Causes
- Open, short, or high-resistance wiring on the SCP/J1850 bus associated with the cooling module
- Corroded, loose or water-damaged connector at the cooling module, ECM/BCM, or gateway module
- Cooling module (fan module/fan control unit) power or ground fault
- Failed cooling module (internal electronics or transceiver)
- Failed engine control module (ECM) or body control module (BCM) gateway that relays cooling data
- Network bus termination fault or excessive electrical noise on the SCP/J1850 line
Symptoms
- Cooling fan does not operate or operates intermittently
- Engine runs hotter than normal or may overheat under load
- Dash warnings related to engine temperature or fan fault
- Reduced A/C cooling performance at low speeds
- Scanner shows U1073 and possibly other network communication codes
- No live data for coolant temperature or fan status from the expected module
What to check
- Connect a factory-level diagnostic tool and read all network/U-codes and freeze-frame data
- Check for related codes (ECM, BCM, fan module) and note time stamps
- Visually inspect connectors and harnesses for corrosion, damage, or water ingress
- Verify battery voltage and charge state; perform basic power/ground checks at the cooling module
- Backprobe the module connector and verify supply voltage and ground integrity
- Use an oscilloscope or lab scope to observe the SCP/J1850 physical layer for messages and noise
Signal parameters
- Network type: SCP (Land Rover implementation of J1850 / message-based serial bus)
- Physical layer: single-wire message bus (nominal voltages around 0–5 V depending on dominant/recessive states) — use scope for verification
- Typical message contents: coolant temp, fan status/commands, fan speed requests, diagnostic/status flags
- Message behavior: periodic status broadcasts and on-demand commands; missing or garbled frames indicate a bus fault
- Common fault signatures: bus stuck high/low, excessive noise, missing periodic packets, invalid frame checksums
Diagnostic algorithm
- Retrieve all stored and pending codes with a capable scan tool and record freeze-frame/live-data related to cooling circuit.
- Check for other communication codes (gateway/ECM/BCM). Address any higher-priority module-power or bus-off conditions first.
- Visually inspect wiring and connectors at the cooling module, ECM and gateway for corrosion, bent pins, water intrusion or mechanical damage.
- Verify power and ground at the cooling module connector with the connector mated and ignition on (measure battery voltage and continuity to chassis ground).
- Monitor live data: confirm coolant temperature and fan status values — if data absent or invalid, note which module is the source.
- Use an oscilloscope to view the SCP/J1850 bus at the module connector and at the gateway/ECM to verify proper message activity and signal integrity (check for stuck-high/low, missing frames, noise).
- Perform a wiggle test of the harness while observing live data or scope to find intermittent wiring faults.
- If physical-layer signals are good at one module but absent at another, trace wiring and check intermediate connectors/terminals; repair damaged wiring or connectors.
- If wiring and power/ground are confirmed good and the bus shows valid traffic to other modules, suspect the cooling module; consult OEM procedures for bench testing or replacement.
- After repairs, clear codes, re-run diagnostics and road-test to confirm cooling messages are present and the symptom is resolved. If intermittent, perform extended monitoring.
Likely causes
- Damaged connector or wiring to the fan control module
- Cooling fan control module failure or its internal communication transceiver
- Loss of power or poor ground to the cooling module
- Corrosion or water intrusion at a connector on the J1850/SCP wiring harness
- Gateway/module refusing or not forwarding cooling messages due to a fault or software issue
Fault status
Status
U1073 — SCP (J1850) invalid or missing data for engine cooling. Communication fault between cooling module and vehicle network; check wiring, power/ground, connectors and module.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
Similar codes
Repair manuals
Brands with available manuals
3,299
The library contains 3,299 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.
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