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Home / DTC / P1855 — Gearbox shift drum#2 movement -Å1

P1855 — Gearbox shift drum#2 movement -Å1

Detailed page for trouble code P1855.

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P1855

MITSUBISHI P — Powertrain

Gearbox shift drum#2 movement -Å1

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

Causes

  • Open, shorted or corroded wiring or connector to the shift drum position sensor or actuator
  • Failed shift drum position sensor (Hall, potentiometer or switch array)
  • Failed shift drum actuator (motor/solenoid) or internal gearbox actuator components
  • Mechanical binding, seized shift drum, damaged detents or worn selector forks
  • Low battery voltage or poor ground affecting actuator operation
  • Faulty transmission control module (TCM) or related ECU software/firmware

Symptoms

  • Inability to select some gears or gearbox stuck in a single gear
  • Transmission warning light or gear/shift-related lamp illuminated
  • Vehicle may go into limp/safe mode with limited gear availability
  • Unusual transmission noises when attempting to shift
  • Erratic or delayed gear engagement

What to check

  • Read and record all stored/transient DTCs and freeze-frame data with a capable scan tool
  • Check battery voltage and charging system health before tests
  • Visually inspect connectors and wiring to shift drum sensors/actuator for damage, corrosion or loose pins
  • Back-probe connector while operating the shift/drum to observe signal voltages and actuator supply
  • Measure resistance of actuator coils and position sensor per service manual
  • Attempt to command actuator with diagnostic tool (ON/OFF or run tests) while observing movement

Signal parameters

  • Position sensor reference voltage typically 5 V (check for 4.5–5.5 V with key on)
  • Position sensor output voltage range typically ~0.5–4.5 V depending on drum position (or digital/Hall square wave where applicable)
  • Actuator supply voltage should be battery voltage when commanded (11–14 V during cranking/running)
  • Actuator coil resistance commonly in the low ohms to tens of ohms (service manual value required)
  • No continuity to ground on signal lines when circuit is open; check for short to battery or ground if voltage stuck

Diagnostic algorithm

  1. Retrieve DTC P1855 and any related codes, record freeze frame and readiness status.
  2. Verify battery voltage (should be >12.2 V at rest) and good grounds before performing electrical checks.
  3. Visually inspect the shift drum #2 sensor/actuator connector and harness for damage or corrosion; repair as needed.
  4. Back-probe the sensor signal and reference wires with ignition ON and shift operations (or use live data). Verify reference voltage, signal response when drum moves, and proper ground.
  5. Measure actuator coil resistance and compare to service specifications. Check for short to ground or short to voltage.
  6. Command the actuator on and off with a diagnostic scanner while observing voltage at the connector and checking for mechanical movement of the drum. If actuator does not respond but receives correct command voltage, suspect mechanical seizure.
  7. If wiring and connectors pass, remove access cover (or remove transmission if required) to inspect the shift drum and related mechanical components for binding, broken forks, or debris.
  8. If mechanical parts are damaged, repair or replace as required. If actuator or sensor is electrically faulty, replace the component.
  9. After repair, clear codes, cycle ignition and perform functional tests and a road test to confirm proper shifting and no return of DTC.
  10. If problem persists with good wiring and components, consider TCM/ECU diagnosis or replacement per manufacturer procedure.

Likely causes

  • Broken or loose connector pins at the sensor/actuator
  • Intermittent short to power or ground in harness where it flexes
  • Actuator coil open or shorted
  • Shift drum physically jammed by debris, corrosion or broken internal part
  • Corroded ground at transmission or engine block
  • TCM output driver failed or internal fault

Fault status

⚠️ Status
Transmission control module detected abnormal or absent movement/feedback from Gearbox shift drum #2. Check wiring, connector, position sensor, actuator and mechanical movement. May cause inability to shift and trigger limp mode.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 2-6 hours

Similar codes

P0750 P0760 P0765 P0705 P0715 P0720
406

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

MITSUBISHI

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Code

P1855

Other P — Powertrain

Transmission Transfer Case Contact Plate 'C' Open Circuit

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

Causes

  • Open, shorted or corroded wiring or connector to the shift drum position sensor or actuator
  • Failed shift drum position sensor (Hall, potentiometer or switch array)
  • Failed shift drum actuator (motor/solenoid) or internal gearbox actuator components
  • Mechanical binding, seized shift drum, damaged detents or worn selector forks
  • Low battery voltage or poor ground affecting actuator operation
  • Faulty transmission control module (TCM) or related ECU software/firmware

Symptoms

  • Inability to select some gears or gearbox stuck in a single gear
  • Transmission warning light or gear/shift-related lamp illuminated
  • Vehicle may go into limp/safe mode with limited gear availability
  • Unusual transmission noises when attempting to shift
  • Erratic or delayed gear engagement

What to check

  • Read and record all stored/transient DTCs and freeze-frame data with a capable scan tool
  • Check battery voltage and charging system health before tests
  • Visually inspect connectors and wiring to shift drum sensors/actuator for damage, corrosion or loose pins
  • Back-probe connector while operating the shift/drum to observe signal voltages and actuator supply
  • Measure resistance of actuator coils and position sensor per service manual
  • Attempt to command actuator with diagnostic tool (ON/OFF or run tests) while observing movement

Signal parameters

  • Position sensor reference voltage typically 5 V (check for 4.5–5.5 V with key on)
  • Position sensor output voltage range typically ~0.5–4.5 V depending on drum position (or digital/Hall square wave where applicable)
  • Actuator supply voltage should be battery voltage when commanded (11–14 V during cranking/running)
  • Actuator coil resistance commonly in the low ohms to tens of ohms (service manual value required)
  • No continuity to ground on signal lines when circuit is open; check for short to battery or ground if voltage stuck

Diagnostic algorithm

  1. Retrieve DTC P1855 and any related codes, record freeze frame and readiness status.
  2. Verify battery voltage (should be >12.2 V at rest) and good grounds before performing electrical checks.
  3. Visually inspect the shift drum #2 sensor/actuator connector and harness for damage or corrosion; repair as needed.
  4. Back-probe the sensor signal and reference wires with ignition ON and shift operations (or use live data). Verify reference voltage, signal response when drum moves, and proper ground.
  5. Measure actuator coil resistance and compare to service specifications. Check for short to ground or short to voltage.
  6. Command the actuator on and off with a diagnostic scanner while observing voltage at the connector and checking for mechanical movement of the drum. If actuator does not respond but receives correct command voltage, suspect mechanical seizure.
  7. If wiring and connectors pass, remove access cover (or remove transmission if required) to inspect the shift drum and related mechanical components for binding, broken forks, or debris.
  8. If mechanical parts are damaged, repair or replace as required. If actuator or sensor is electrically faulty, replace the component.
  9. After repair, clear codes, cycle ignition and perform functional tests and a road test to confirm proper shifting and no return of DTC.
  10. If problem persists with good wiring and components, consider TCM/ECU diagnosis or replacement per manufacturer procedure.

Likely causes

  • Broken or loose connector pins at the sensor/actuator
  • Intermittent short to power or ground in harness where it flexes
  • Actuator coil open or shorted
  • Shift drum physically jammed by debris, corrosion or broken internal part
  • Corroded ground at transmission or engine block
  • TCM output driver failed or internal fault

Fault status

⚠️ Status
Transmission control module detected abnormal or absent movement/feedback from Gearbox shift drum #2. Check wiring, connector, position sensor, actuator and mechanical movement. May cause inability to shift and trigger limp mode.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 2-6 hours

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Code

P1855

VOLKSWAGEN P — Powertrain

CAN Bus Software Version Control

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

Causes

  • Open, shorted or corroded wiring or connector to the shift drum position sensor or actuator
  • Failed shift drum position sensor (Hall, potentiometer or switch array)
  • Failed shift drum actuator (motor/solenoid) or internal gearbox actuator components
  • Mechanical binding, seized shift drum, damaged detents or worn selector forks
  • Low battery voltage or poor ground affecting actuator operation
  • Faulty transmission control module (TCM) or related ECU software/firmware

Symptoms

  • Inability to select some gears or gearbox stuck in a single gear
  • Transmission warning light or gear/shift-related lamp illuminated
  • Vehicle may go into limp/safe mode with limited gear availability
  • Unusual transmission noises when attempting to shift
  • Erratic or delayed gear engagement

What to check

  • Read and record all stored/transient DTCs and freeze-frame data with a capable scan tool
  • Check battery voltage and charging system health before tests
  • Visually inspect connectors and wiring to shift drum sensors/actuator for damage, corrosion or loose pins
  • Back-probe connector while operating the shift/drum to observe signal voltages and actuator supply
  • Measure resistance of actuator coils and position sensor per service manual
  • Attempt to command actuator with diagnostic tool (ON/OFF or run tests) while observing movement

Signal parameters

  • Position sensor reference voltage typically 5 V (check for 4.5–5.5 V with key on)
  • Position sensor output voltage range typically ~0.5–4.5 V depending on drum position (or digital/Hall square wave where applicable)
  • Actuator supply voltage should be battery voltage when commanded (11–14 V during cranking/running)
  • Actuator coil resistance commonly in the low ohms to tens of ohms (service manual value required)
  • No continuity to ground on signal lines when circuit is open; check for short to battery or ground if voltage stuck

Diagnostic algorithm

  1. Retrieve DTC P1855 and any related codes, record freeze frame and readiness status.
  2. Verify battery voltage (should be >12.2 V at rest) and good grounds before performing electrical checks.
  3. Visually inspect the shift drum #2 sensor/actuator connector and harness for damage or corrosion; repair as needed.
  4. Back-probe the sensor signal and reference wires with ignition ON and shift operations (or use live data). Verify reference voltage, signal response when drum moves, and proper ground.
  5. Measure actuator coil resistance and compare to service specifications. Check for short to ground or short to voltage.
  6. Command the actuator on and off with a diagnostic scanner while observing voltage at the connector and checking for mechanical movement of the drum. If actuator does not respond but receives correct command voltage, suspect mechanical seizure.
  7. If wiring and connectors pass, remove access cover (or remove transmission if required) to inspect the shift drum and related mechanical components for binding, broken forks, or debris.
  8. If mechanical parts are damaged, repair or replace as required. If actuator or sensor is electrically faulty, replace the component.
  9. After repair, clear codes, cycle ignition and perform functional tests and a road test to confirm proper shifting and no return of DTC.
  10. If problem persists with good wiring and components, consider TCM/ECU diagnosis or replacement per manufacturer procedure.

Likely causes

  • Broken or loose connector pins at the sensor/actuator
  • Intermittent short to power or ground in harness where it flexes
  • Actuator coil open or shorted
  • Shift drum physically jammed by debris, corrosion or broken internal part
  • Corroded ground at transmission or engine block
  • TCM output driver failed or internal fault

Fault status

⚠️ Status
Transmission control module detected abnormal or absent movement/feedback from Gearbox shift drum #2. Check wiring, connector, position sensor, actuator and mechanical movement. May cause inability to shift and trigger limp mode.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 2-6 hours

Similar codes

P0750 P0760 P0765 P0705 P0715 P0720
139

Browse 139 VOLKSWAGEN manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

VOLKSWAGEN

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

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