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Home / DTC / U1009 — SCP (J1850) invalid or missing engine torque data

U1009 — SCP (J1850) invalid or missing engine torque data

Detailed page for trouble code U1009.

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U1009

LAND ROVER U — Network/User

SCP (J1850) invalid or missing engine torque data

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

Causes

  • Missing or intermittent SCP (J1850) message containing engine torque
  • Damaged, corroded, or disconnected wiring/connectors on the SCP/J1850 bus or at the sending module
  • Faulty engine control module (ECM/PCM) or other module that supplies torque data
  • Network bus interference from aftermarket electronics or short/low impedance to power or ground on the bus
  • Software/firmware bug or failed module wake-up causing invalid or malformed messages

Symptoms

  • MIL/SES or network-related warning lamps illuminated
  • Reduced engine torque protection or limp-home behavior (reduced power, derate)
  • Transmission shift logic abnormal (harsh or incorrect shifting) due to missing torque input
  • Loss of related features that use engine torque (cruise control, traction control calibration)
  • Intermittent drivability issues that clear when code is cleared but return on restart

What to check

  • Use an OEM-level scan tool and read freeze frame and all U-codes from all modules
  • Check for other network communication codes (U0100, U1000 etc.) that identify broader bus issues
  • Verify battery and charging system voltage at rest and under cranking (low voltage can cause comms faults)
  • Visually inspect connectors and wiring for damage, corrosion, or aftermarket splices on the SCP/J1850 bus and at the PCM/ECM
  • Perform wiggle test on harnesses with the network tool connected to see if code or message loss is provoked
  • Check module power and ground circuits for proper voltages and good grounds

Signal parameters

  • Engine torque broadcast message present on SCP/J1850 bus at a periodic interval (typically several times per second)
  • Message payload includes a torque value field (signed or unsigned) representing engine torque or torque request; value should vary with throttle/RPM
  • Message includes integrity elements (checksum/counter); corrupted packets will be invalid
  • Expected torque values lie within manufacturer-specified range; constant zero or fixed invalid values indicate a fault
  • Loss condition: message timeout (no broadcasts within expected interval) or repeated checksum/format errors

Diagnostic algorithm

  1. Record vehicle information and confirm code U1009 with an OEM scan tool; note freeze frame and related codes
  2. Inspect battery terminals, charge state and ensure stable supply (12.6 V+ at rest); repair charging/battery issues first
  3. Scan all modules for additional U-codes to determine if fault is isolated or network-wide
  4. Visually inspect wiring harnesses, connectors and ground points for the PCM/ECM and other modules on the SCP/J1850 bus; repair any damaged wiring or corroded connectors
  5. With a capable scan tool or network analyzer, monitor the SCP/J1850 bus while running engine to confirm whether engine torque message is transmitted and valid; capture a trace for review
  6. Perform a wiggle test and connector reseating while watching live network traffic to see if message loss correlates with harness movement
  7. If message absent or malformed, check power and ground at the sending module and test module inputs/outputs per factory wiring diagram
  8. Check for aftermarket devices (alarms, remote starters, audio amps) tied into the vehicle network; disconnect and re-test
  9. If wiring and power/grounds are good but message still invalid, try known-good replacement module or reflash/update module software per manufacturer Technical Service Bulletins (TSBs)
  10. After repair, clear codes, perform a road test and re-scan to verify the U1009 does not return

Likely causes

  • Open or high-resistance connector at engine PCM or intermediate junction
  • Shorted SCP/J1850 bus conductor to battery or ground after an electrical repair or accessory installation
  • ECM/PCM hardware fault or internal processor error preventing valid torque broadcast
  • Corrosion or bent pins at multi-pin connectors between modules
  • Outdated or corrupted software in the sending module producing invalid message format

Fault status

⚠️ Status
U1009 — SCP (J1850) engine torque data invalid or missing; receiving module not getting valid torque message on vehicle network.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-4.0 hours

Similar codes

U1000 U0100 U0101 U0121 U0140
413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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