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Home / DTC / U2007 — SPI Clock-Out High

U2007 — SPI Clock-Out High

Detailed page for trouble code U2007.

34,405codes
59brands
11,914generic
22,491specific
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U2007

HUMMER U — Network/User

SPI Clock-Out High

Brand: HUMMER
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Shorted SCLK line to battery/ignition voltage (Vb/Vcc).
  • Open or high-resistance connection on SCLK causing pull‑up to dominate.
  • Faulty module driving the SPI clock (internal output stuck high).
  • Corroded/loose connector or damaged wiring harness on the SPI clock circuit.
  • Incorrect module software/firmware or configuration error causing SCLK to be held high.
  • Intermittent short or bridging to a nearby power circuit due to chafing or contamination.

Symptoms

  • Loss of function for devices on the SPI bus (e.g., sensors, displays, subsystems).
  • Communication-related DTCs and multiple modules reporting errors.
  • Systems that share the same SPI bus may be inoperative or intermittent.
  • Possible MIL or warning lights related to affected systems.

What to check

  • Retrieve freeze-frame and full DTC list from all modules with a capable scan tool.
  • Visually inspect connectors, pins and wiring of modules on the SPI bus for damage, corrosion, or pin-backout.
  • Locate which module is the SPI master (clock source) from wiring diagrams/service manual.
  • Check for related codes that identify slave devices or the master module.
  • Measure the SCLK line with a multimeter (DC) and oscilloscope (best) at the suspected module connector and at slave device connectors.
  • Perform wiggle tests on harness and connectors while monitoring SCLK for changes.

Signal parameters

  • Expected waveform: periodic clock pulses (SCLK) toggling between ground and module Vcc (common values 3.3 V or 5 V depending on vehicle system).
  • Idle behavior: clock line should not be stuck high; may be tri-stated when inactive.
  • Frequency: depends on system — typically kHz to low MHz range. Check OEM service data for exact frequency.
  • Duty cycle: approximately 50% for many SPI implementations but can vary.
  • Fault indication: DC measurement near Vcc (no toggling) or oscilloscope shows flat high level instead of clock pulses.

Diagnostic algorithm

  1. Connect a factory-level scan tool and record all communication and module DTCs; note when U2007 first occurred and affected modules.
  2. Obtain wiring diagram/service manual to identify the SPI master and all slave devices on that bus.
  3. Perform visual inspection of connectors, pins, and harness routes for damage, corrosion, or signs of shorting; repair any obvious issues.
  4. With ignition on (as required by procedure), measure SCLK at the master module connector: first with a DMM (DC) to see if line is at Vcc, then with an oscilloscope to confirm presence or absence of clock pulses.
  5. If SCLK is high at the master connector, suspect the master module. Verify reference power and ground to that module per OEM procedure. Check for blown fuses or poor grounds.
  6. If SCLK is normal at the master but high at a downstream connector, isolate segments by disconnecting slave devices one at a time to identify which device introduces the fault.
  7. Inspect and test connectors/pins of the identified segment or device; repair wiring harness faults (shorts to Vb, chafed insulation) or replace damaged connectors.
  8. If a specific module is identified as defective (driving SCLK high), verify with module bench test or replace per OEM guidance. Reprogram/update module software if manufacturer bulletin suggests.
  9. After repairs, clear DTCs, perform relearn/initialization procedures if required, and road/test to confirm the fault does not return.
  10. If intermittent, consider harness protection (routing, loom repair) or use back-probing/monitoring to capture failure when it occurs.

Likely causes

  • Damaged wiring or connector to the module that generates the SPI clock.
  • Faulty master module (module that outputs SCLK) with internal driver failure.
  • Short to battery voltage on the SCLK conductor (pin-to-Vb).

Fault status

⚠️ Status
SPI Clock-Out (SCLK) line detected stuck high; SPI master or wiring may be holding clock at Vcc and preventing SPI communication.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U1000 U0073 U2100 U2106 U3000
Repair manuals

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138

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Code

U2007

LAND ROVER U — Network/User

Valve Circuit

Brand: LAND ROVER
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Shorted SCLK line to battery/ignition voltage (Vb/Vcc).
  • Open or high-resistance connection on SCLK causing pull‑up to dominate.
  • Faulty module driving the SPI clock (internal output stuck high).
  • Corroded/loose connector or damaged wiring harness on the SPI clock circuit.
  • Incorrect module software/firmware or configuration error causing SCLK to be held high.
  • Intermittent short or bridging to a nearby power circuit due to chafing or contamination.

Symptoms

  • Loss of function for devices on the SPI bus (e.g., sensors, displays, subsystems).
  • Communication-related DTCs and multiple modules reporting errors.
  • Systems that share the same SPI bus may be inoperative or intermittent.
  • Possible MIL or warning lights related to affected systems.

What to check

  • Retrieve freeze-frame and full DTC list from all modules with a capable scan tool.
  • Visually inspect connectors, pins and wiring of modules on the SPI bus for damage, corrosion, or pin-backout.
  • Locate which module is the SPI master (clock source) from wiring diagrams/service manual.
  • Check for related codes that identify slave devices or the master module.
  • Measure the SCLK line with a multimeter (DC) and oscilloscope (best) at the suspected module connector and at slave device connectors.
  • Perform wiggle tests on harness and connectors while monitoring SCLK for changes.

Signal parameters

  • Expected waveform: periodic clock pulses (SCLK) toggling between ground and module Vcc (common values 3.3 V or 5 V depending on vehicle system).
  • Idle behavior: clock line should not be stuck high; may be tri-stated when inactive.
  • Frequency: depends on system — typically kHz to low MHz range. Check OEM service data for exact frequency.
  • Duty cycle: approximately 50% for many SPI implementations but can vary.
  • Fault indication: DC measurement near Vcc (no toggling) or oscilloscope shows flat high level instead of clock pulses.

Diagnostic algorithm

  1. Connect a factory-level scan tool and record all communication and module DTCs; note when U2007 first occurred and affected modules.
  2. Obtain wiring diagram/service manual to identify the SPI master and all slave devices on that bus.
  3. Perform visual inspection of connectors, pins, and harness routes for damage, corrosion, or signs of shorting; repair any obvious issues.
  4. With ignition on (as required by procedure), measure SCLK at the master module connector: first with a DMM (DC) to see if line is at Vcc, then with an oscilloscope to confirm presence or absence of clock pulses.
  5. If SCLK is high at the master connector, suspect the master module. Verify reference power and ground to that module per OEM procedure. Check for blown fuses or poor grounds.
  6. If SCLK is normal at the master but high at a downstream connector, isolate segments by disconnecting slave devices one at a time to identify which device introduces the fault.
  7. Inspect and test connectors/pins of the identified segment or device; repair wiring harness faults (shorts to Vb, chafed insulation) or replace damaged connectors.
  8. If a specific module is identified as defective (driving SCLK high), verify with module bench test or replace per OEM guidance. Reprogram/update module software if manufacturer bulletin suggests.
  9. After repairs, clear DTCs, perform relearn/initialization procedures if required, and road/test to confirm the fault does not return.
  10. If intermittent, consider harness protection (routing, loom repair) or use back-probing/monitoring to capture failure when it occurs.

Likely causes

  • Damaged wiring or connector to the module that generates the SPI clock.
  • Faulty master module (module that outputs SCLK) with internal driver failure.
  • Short to battery voltage on the SCLK conductor (pin-to-Vb).

Fault status

⚠️ Status
SPI Clock-Out (SCLK) line detected stuck high; SPI master or wiring may be holding clock at Vcc and preventing SPI communication.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U1000 U0073 U2100 U2106 U3000
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

U2007

Other U — Network/User

Audio Navigation Unit is Not Responding

Brand: Other
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Shorted SCLK line to battery/ignition voltage (Vb/Vcc).
  • Open or high-resistance connection on SCLK causing pull‑up to dominate.
  • Faulty module driving the SPI clock (internal output stuck high).
  • Corroded/loose connector or damaged wiring harness on the SPI clock circuit.
  • Incorrect module software/firmware or configuration error causing SCLK to be held high.
  • Intermittent short or bridging to a nearby power circuit due to chafing or contamination.

Symptoms

  • Loss of function for devices on the SPI bus (e.g., sensors, displays, subsystems).
  • Communication-related DTCs and multiple modules reporting errors.
  • Systems that share the same SPI bus may be inoperative or intermittent.
  • Possible MIL or warning lights related to affected systems.

What to check

  • Retrieve freeze-frame and full DTC list from all modules with a capable scan tool.
  • Visually inspect connectors, pins and wiring of modules on the SPI bus for damage, corrosion, or pin-backout.
  • Locate which module is the SPI master (clock source) from wiring diagrams/service manual.
  • Check for related codes that identify slave devices or the master module.
  • Measure the SCLK line with a multimeter (DC) and oscilloscope (best) at the suspected module connector and at slave device connectors.
  • Perform wiggle tests on harness and connectors while monitoring SCLK for changes.

Signal parameters

  • Expected waveform: periodic clock pulses (SCLK) toggling between ground and module Vcc (common values 3.3 V or 5 V depending on vehicle system).
  • Idle behavior: clock line should not be stuck high; may be tri-stated when inactive.
  • Frequency: depends on system — typically kHz to low MHz range. Check OEM service data for exact frequency.
  • Duty cycle: approximately 50% for many SPI implementations but can vary.
  • Fault indication: DC measurement near Vcc (no toggling) or oscilloscope shows flat high level instead of clock pulses.

Diagnostic algorithm

  1. Connect a factory-level scan tool and record all communication and module DTCs; note when U2007 first occurred and affected modules.
  2. Obtain wiring diagram/service manual to identify the SPI master and all slave devices on that bus.
  3. Perform visual inspection of connectors, pins, and harness routes for damage, corrosion, or signs of shorting; repair any obvious issues.
  4. With ignition on (as required by procedure), measure SCLK at the master module connector: first with a DMM (DC) to see if line is at Vcc, then with an oscilloscope to confirm presence or absence of clock pulses.
  5. If SCLK is high at the master connector, suspect the master module. Verify reference power and ground to that module per OEM procedure. Check for blown fuses or poor grounds.
  6. If SCLK is normal at the master but high at a downstream connector, isolate segments by disconnecting slave devices one at a time to identify which device introduces the fault.
  7. Inspect and test connectors/pins of the identified segment or device; repair wiring harness faults (shorts to Vb, chafed insulation) or replace damaged connectors.
  8. If a specific module is identified as defective (driving SCLK high), verify with module bench test or replace per OEM guidance. Reprogram/update module software if manufacturer bulletin suggests.
  9. After repairs, clear DTCs, perform relearn/initialization procedures if required, and road/test to confirm the fault does not return.
  10. If intermittent, consider harness protection (routing, loom repair) or use back-probing/monitoring to capture failure when it occurs.

Likely causes

  • Damaged wiring or connector to the module that generates the SPI clock.
  • Faulty master module (module that outputs SCLK) with internal driver failure.
  • Short to battery voltage on the SCLK conductor (pin-to-Vb).

Fault status

⚠️ Status
SPI Clock-Out (SCLK) line detected stuck high; SPI master or wiring may be holding clock at Vcc and preventing SPI communication.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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