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Home / DTC / C2781 — Compressor solenoid failure

C2781 — Compressor solenoid failure

Detailed page for trouble code C2781.

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Code

C2781

LAND ROVER C — Chassis

Compressor solenoid failure

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

Causes

  • Open or short in solenoid wiring or connector
  • Faulty compressor solenoid (coil or internal valve stuck)
  • Corroded or loose connector or terminals
  • Failed driver in the control module or BCM
  • Insufficient supply voltage (battery/charging issue)
  • Intermittent connection due to damaged harness or chafing

Symptoms

  • Warning message or lamp related to suspension or climate control
  • Compressor fails to run or compressor runs but system does not actuate
  • Intermittent operation of the compressor or loss of system function
  • Unusual noise from compressor or solenoid area
  • Reduced system performance (e.g., suspension won’t raise or HVAC not controlling refrigerant flow)

What to check

  • Read and record all stored and pending codes and freeze frame data
  • Visual inspection of compressor, solenoid, connector and wiring for damage or corrosion
  • Check battery voltage and charging system before and during tests
  • Inspect relevant fuses and relay contacts for the compressor circuit
  • Backprobe solenoid connector to verify supply voltage and ground while commanded
  • Measure solenoid coil resistance with connector disconnected (compare to spec)

Signal parameters

  • Supply voltage at solenoid (key ON, engine OFF): approx. battery voltage (~11–14 V)
  • Command voltage when activated: close to battery voltage or switched ground depending on design
  • Typical solenoid coil resistance (generic): ~10–50 ohms (refer to vehicle-specific spec)
  • PWM control may be used: duty cycle 0–100% and frequency commonly in tens to low hundreds Hz (check manufacturer data)
  • No continuity (infinite) indicates open coil; very low resistance (

Diagnostic algorithm

  1. Retrieve all relevant codes and freeze frame; note last events and battery voltage.
  2. Perform visual inspection: check harness, connector for corrosion, pin damage, and secure mounting of compressor and solenoid.
  3. Verify fuse(s) and relay(s) for the compressor circuit are present and making good contact.
  4. With connector disconnected, measure solenoid coil resistance and compare to manufacturer spec. Replace solenoid if out of range.
  5. With connector connected, backprobe positive supply and ground terminal. Command the solenoid ON using a diagnostic tool and confirm correct voltage/ground is present.
  6. If commanded voltage/ground is absent, trace wiring back to the fuse/relay and control module; check for open, short to battery or ground, and poor connections.
  7. If wiring and supply are good but the solenoid does not operate, verify the control module output using scope or DVOM while commanding; look for PWM or switching action.
  8. If control module output is faulty, inspect for related wiring faults and grounds; replace control module only after ruling out wiring and load faults.
  9. After repair or component replacement, clear codes and perform a functional test and road/operation test to confirm the fault does not return.
  10. Document repair and advise recheck if intermittent faults continue (may require extended drive or environmental testing).

Likely causes

  • Damaged solenoid wiring harness (pinched or chafed underframe)
  • Water ingress/corrosion at compressor/solenoid connector
  • Blown fuse or poor fuse connection for compressor circuit
  • Defective compressor solenoid coil (open or shorted)
  • Faulty ground at compressor mounting or body ground point
  • Defective control module output stage for the solenoid

Fault status

⚠️ Status
Compressor solenoid circuit fault detected — electrical/activation failure (open/short/intermittent) or solenoid not responding to control commands.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

C2780 C2782 C2777 C2756 C1A00
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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