Toggle Side Panel

Shopping Cart

No products in the basket.

Shopping Cart

No products in the basket.

Close search
Home / DTC / P1867 — Gearbox encoder #2 error(Signal)

P1867 — Gearbox encoder #2 error(Signal)

Detailed page for trouble code P1867.

34,405codes
59brands
11,914generic
22,491specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
Reset
Code

P1867

MITSUBISHI P — Powertrain

Gearbox encoder #2 error(Signal)

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

Causes

  • Open or shorted wiring between encoder and transmission control unit (TCU)
  • Corroded, loose or contaminated connector at encoder or TCU
  • Failed gearbox encoder (sensor) or internal wiring
  • Poor ground or power supply to encoder circuit
  • Damaged harness from chafing, heat, or mechanical impact
  • Transmission fluid contamination or internal mechanical damage affecting encoder

Symptoms

  • Transmission warning light (TCU/AT lamp) illuminated
  • Erratic or harsh shifting, incorrect gear selection
  • Transmission stuck in limp/limitation mode
  • Gear position indicator incorrect or fluctuating
  • Possible drivability issues: reduced performance or hesitation

What to check

  • Read stored and pending DTCs and freeze-frame data with a capable scanner
  • Monitor live data: encoder #2 signal, encoder #1 (if present), transmission speeds, and TCU power/ground status
  • Visually inspect encoder connector and harness for damage, corrosion, or fluid
  • Wiggle harness and connector while monitoring signal for intermittent faults
  • Back-probe connector for reference voltage and ground with ignition ON
  • Measure continuity and resistance of wiring between encoder and TCU (power, signal, ground)

Signal parameters

  • Reference voltage typically 5 V (verify exact vehicle spec) to sensor power pin
  • Signal is a pulsed/sinusoidal waveform whose frequency changes with shaft speed (0–5 V square or resolver AC waveform depending on sensor type)
  • At rest: signal may be steady or zero volts; when shaft rotates: frequency and duty vary proportionally
  • Good ground continuity required; open circuit = no signal, short to 12 V or ground = fault
  • Expected behavior: smooth, continuous waveform without dropouts or excessive noise proportional to transmission input/output speed

Diagnostic algorithm

  1. Capture codes and freeze frame, then clear codes and test-drive to reproduce.
  2. Visually inspect encoder, connector, and wiring for damage or fluid contamination.
  3. With ignition ON (engine off if instructed by service manual), back-probe power and ground pins at encoder to confirm reference voltage and ground presence.
  4. Monitor encoder signal with a scan tool or oscilloscope while rotating transmission input/output (or during road test) and compare waveform to expected behavior.
  5. Wiggle the wiring and connector while monitoring live data to detect intermittent faults.
  6. Check continuity and isolation: measure resistance between encoder signal and TCU pin, and check for shorts to battery or ground.
  7. If wiring and connectors are good but signal is absent or out of spec, replace the gearbox encoder. Re-test and verify no new codes.
  8. If replacement encoder does not correct the issue, test/inspect TCU connector and wiring harness back to the TCU; consider TCU fault or reprogramming as last resort.
  9. After repair, clear codes and perform final road test to confirm proper shifting and no recurrence.

Likely causes

  • Connector corrosion or poor pin contact at the encoder connector
  • Broken/crushed wires or intermittent harness connection (wiggle-sensitive)
  • Encoder element failure (internal electronics or Hall/resolver element)
  • Low/unstable reference voltage or missing ground to the encoder
  • Fluid ingress or physical damage to the encoder assembly

Fault status

⚠️ Status
Gearbox encoder #2 signal fault detected — signal missing, out of range, or intermittent (TCU fault stored).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

P0720 P0725 P0730 P0741 P1868
406

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

MITSUBISHI

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

Report

Harassment or bullying behavior
Contains mature or sensitive content
Contains misleading or false information
Contains abusive or derogatory content
Contains spam, fake content or potential malware

Block Member?

Please confirm you want to block this member.

You will no longer be able to:

  • See blocked member's posts
  • Mention this member in posts
  • Invite this member to groups
  • Message this member
  • Add this member as a connection

Please note: This action will also remove this member from your connections and send a report to the site admin. Please allow a few minutes for this process to complete.

Report

You have already reported this .