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Home / DTC / P1935 — Gear ACT.error drum interchanged

P1935 — Gear ACT.error drum interchanged

Detailed page for trouble code P1935.

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Code

P1935

MITSUBISHI P — Powertrain

Gear ACT.error drum interchanged

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

Causes

  • Gear actuator drum installed in wrong orientation or wrong part fitted during service
  • Faulty or misaligned actuator/position sensor (hall or potentiometer)
  • Damaged or corroded wiring, connectors, or terminals to the actuator/sensor
  • Faulty shift solenoid(s) or valve body causing incorrect drum movement
  • Low, contaminated, or incorrect transmission fluid preventing proper drum movement
  • Internal mechanical damage or wear in the drum, linkage, or valve body

Symptoms

  • AT/Check Engine MIL illuminated
  • Erratic gear selection or harsh/late shifts
  • Transmission stuck in one gear or default/limp mode
  • Gear displayed on dash does not match actual gear
  • Reduced drivability or loss of select gears

What to check

  • Read freeze-frame data and full DTC list with a capable scan tool (include manufacturer transmission data)
  • Check service history for recent transmission work or part replacement
  • Visual inspection of transmission fluid level, color, and odor (burnt smell or heavy contamination)
  • Inspect wiring harness and connectors at the actuator/valve body for damage, corrosion, pin push-out, or water intrusion
  • Visually inspect actuator/drum for correct part number, orientation, and physical damage
  • Perform actuator/solenoid active tests with scan tool and observe drum/gear movement if supported

Signal parameters

  • Reference voltage to position sensor: typically ~5 V (verify exact value in service manual)
  • Position sensor output: typically variable 0.5–4.5 V proportional to drum position (consult OEM spec)
  • Sensor ground: continuity to chassis ground, low resistance (
  • Actuator/solenoid coil resistance: typically in the low tens of ohms (varies by design) — check OEM values
  • Control voltage from TCM during active test: pulses or switched 12 V depending on design (use oscilloscope/scan tool)

Diagnostic algorithm

  1. Connect a factory-level scan tool and record all transmission-related codes and freeze-frame data. Note any other related codes (TCM, sensors).
  2. Ask operator about recent transmission service or part replacement. If present, suspect incorrect assembly or wrong part.
  3. Visually inspect transmission fluid level and condition. Top up or change fluid if low/contaminated before further testing.
  4. Visually inspect the actuator/drum assembly and associated connectors for physical damage, incorrect orientation, or mismatched part numbers.
  5. With ignition on, backprobe the sensor/actuator connector and verify reference voltage, ground continuity, and sensor output. Compare to OEM specs.
  6. Perform active actuator/drum movement tests with the scan tool. Confirm the drum moves to commanded positions and that sensor feedback corresponds.
  7. Check resistance of shift solenoids and actuators against specifications. Replace any solenoid or actuator outside spec.
  8. Inspect wiring harness for intermittent faults (wiggle test), corrosion, or short to power/ground. Repair as necessary.
  9. If tests indicate the drum was installed incorrectly (interchanged) or mechanically damaged, remove transmission or valve body per service manual and correct drum orientation/replace damaged parts.
  10. After repairs, clear codes, perform relearn/calibration procedures if required by the manufacturer, then road test and re-scan to confirm the fault is resolved.

Likely causes

  • Incorrect assembly after recent transmission service (most likely if code appears after repair)
  • Actuator or position sensor failure
  • Wiring harness/connector fault in actuator circuit
  • Hydraulic/mechanical restriction from contaminated fluid or internal wear

Fault status

⚠️ Status
TCM reports gear actuator/drum position mismatch (drum interchanged). Transmission gear selection not matching expected drum position.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 3-6 hours

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Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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