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Home / DTC / P1742 — CVT clutch solenoid

P1742 — CVT clutch solenoid

Detailed page for trouble code P1742.

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Code

P1742

MITSUBISHI P — Powertrain

CVT clutch solenoid

Brand: MITSUBISHI
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted wiring to the clutch solenoid
  • Poor or corroded connector pin contact
  • Faulty CVT clutch solenoid valve (stuck or electrically failed)
  • Low, contaminated, or incorrect CVT fluid
  • Internal valve body or hydraulic block contamination or sticking
  • Faulty transmission control unit (TCU) or software issue

Symptoms

  • Check Engine / AT warning lamp illuminated
  • Transmission limp mode or reduced shift functionality
  • Delayed or harsh engagement/shift
  • Erratic CVT ratio hunting or loss of acceleration
  • Unusual transmission noise or slipping sensation
  • Poor fuel economy or transmission overheating warning

What to check

  • Read stored DTCs and freeze frame data from TCU/scan tool
  • Visual inspection of solenoid connector and wiring for damage or corrosion
  • Check CVT fluid level, condition and correct specification
  • Measure solenoid coil resistance and compare to factory spec
  • Backprobing connector to verify supply voltage and ground while ignition ON and during commanded operation
  • Use scan tool to command solenoid and observe response (pressure/ratio changes, status PID)

Signal parameters

  • Solenoid coil resistance: typically a low-ohm value (varies by model; commonly single- to low-double-digit ohms). Consult vehicle service data for exact spec.
  • Control signal: PWM duty cycle controlled by TCU (0–100% duty) rather than a steady DC voltage on most systems
  • Supply voltage: nominal battery/ignition voltage (~12 V) present at solenoid power feed when circuit enabled
  • Expected behavior: coil resistance within spec, continuity to TCU, PWM signal present when commanded and solenoid responds hydraulically

Diagnostic algorithm

  1. Retrieve all transmission-related codes and freeze/frame data with a capable scan tool. Note conditions when code set.
  2. Perform a visual inspection of the solenoid connector, pins, and wiring harness for corrosion, breaks, or pin push-out.
  3. Check CVT fluid level and condition; replace or filter if burnt, dark, or contaminated before further electrical diagnosis if necessary.
  4. Disconnect connector and measure solenoid coil resistance; compare to factory specification. Replace solenoid if resistance is out of range or open/shorted.
  5. Backprobe connector with ignition ON and with TCU commanding the solenoid. Verify battery feed, ground, and PWM control signal using a scope or high-speed data from scan tool.
  6. Wiggle test harness while monitoring voltages/PIDs to find intermittent faults.
  7. If electrical supply and control signals are correct but solenoid does not actuate, remove and bench-test/replace the solenoid and re-check hydraulic response.
  8. If wiring and solenoid check OK, inspect valve body/hydraulic block for contamination or mechanical sticking; rebuild or replace as required.
  9. If all subsystem checks are good, consider TCU fault or software; verify TCU grounds and reflash or replace TCU per manufacturer guidance.
  10. Clear codes and perform road test to confirm repair; re-scan for any reoccurring faults.

Likely causes

  • Connector corrosion or loose terminal at the solenoid
  • Solenoid coil failure (open/short)
  • Wiring harness damage (chafing/short to ground or power)
  • Contaminated CVT fluid causing valve sticking
  • Failed TCU or poor ground at control module

Fault status

⚠️ Status
P1742 — CVT clutch solenoid circuit/performance fault. TCU detected abnormal electrical signal or improper control of the CVT clutch solenoid. May cause limp mode and degraded transmission performance.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

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406

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