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Home / DTC / C1A90 — Manufacturer-specific DTC C1A90 — consult Land Rover service documentation

C1A90 — Manufacturer-specific DTC C1A90 — consult Land Rover service documentation

Detailed page for trouble code C1A90.

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C1A90

LAND ROVER C — Chassis

Manufacturer-specific DTC C1A90 — consult Land Rover service documentation

Brand: LAND ROVER
Type: C — Chassis
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Page language: EN

Causes

  • Intermittent or permanent fault in the module that set the code
  • Sensor or actuator open, shorted, or out-of-range
  • Poor electrical connection (corrosion, loose connector, damaged wiring, broken pin)
  • Low or noisy supply voltage or ground to the module
  • Faulty CAN/LIN bus communication between modules
  • Recent software update or calibration failure

Symptoms

  • One or more warning lights illuminated (specific lamp depends on subsystem)
  • Related subsystem degraded or inoperative (e.g., ABS, air suspension, steering assist—depends on lamp)
  • Intermittent operation of affected system components
  • Stored freeze-frame data or multiple related codes present
  • Possible loss of certain driver aids or reduced performance

What to check

  • Retrieve full DTC list and freeze-frame data with a Land Rover-capable diagnostic tool
  • Check for additional manufacturer codes or accompanying U/C/B codes (communication codes)
  • Visually inspect connectors and wiring at the suspected module and related sensors for corrosion, damage, or loose pins
  • Verify vehicle battery state-of-charge and charging system voltage
  • Check for a recent software update or service event that could have affected module configuration
  • Attempt to clear the code and reproduce the fault while monitoring live data

Signal parameters

  • Module supply voltage (approx. 11–14.5 V)
  • Module ground integrity (low resistance to chassis ground)
  • CAN bus voltage levels and activity (CAN_H/CAN_L idle voltages ~2.5 V differential, proper recessive state)
  • LIN bus signal waveform and voltage (if applicable)
  • Associated sensor voltages or resistance values (specific sensors depend on subsystem)
  • Message identifiers and frequency for related CAN/LIN messages (presence/absence of messages)

Diagnostic algorithm

  1. Read all stored codes and freeze-frame data using a Land Rover approved diagnostic tool; note time, mileage, and operating conditions. 2) Identify the module and subsystem that reported C1A90 from the manufacturer tool or wiring diagrams. 3) Perform a visual inspection of the module connector(s), wiring harness, and nearby components for damage, corrosion, or poor seating; repair any issues found. 4) Check battery voltage and charging system; ensure proper supply voltage to the module. 5) Using the diagnostic tool, monitor module power, ground, and communication data (CAN/LIN). Verify that expected messages are present and modules respond to requests. 6) If communication is absent or intermittent, trace and test CAN/LIN wiring, check termination resistors and inline connectors, and repair wiring faults. 7) Test related sensors/actuators (voltage, resistance, output signal) per manufacturer specifications; replace components only after confirming failure. 8) If wiring and sensors are good, attempt module reset and re-run self-tests. If the code returns, consider reflashing module software or performing module reprogramming only with correct Land Rover procedures. 9) If reprogramming does not resolve the fault, suspect module internal failure; confirm with a known-good module swap or bench test where available. 10) After repairs, clear codes and perform road test or functional checks to ensure the fault does not reappear. Document all steps and results.
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Likely causes

  • Corroded/loose connector at the module or associated sensor
  • Damaged wiring harness (chafing, pinched, rodent damage)
  • Module internal fault (component failure)
  • Intermittent CAN/LIN bus communication error due to termination or wiring issue
  • Failed sensor or actuator that the module monitors

Fault status

⚠️ Status
Manufacturer-specific fault C1A90 logged by control module. Consult Land Rover service documentation for the exact definition and subsystem. Freeze-frame and associated codes may identify operating conditions when the fault occurred.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3.0 hours

Similar codes

C1A91 C1A92 C1A80 C1A9A U0100
320

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

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