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Home / DTC / P1875 — Gearbox potentio#2 error(SRC Up)

P1875 — Gearbox potentio#2 error(SRC Up)

Detailed page for trouble code P1875.

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Code

P1875

MITSUBISHI P — Powertrain

Gearbox potentio#2 error(SRC Up)

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

Causes

  • Open or shorted wiring in potentiometer #2 circuit
  • Corroded or loose connector at potentiometer or gearbox harness
  • Faulty gearbox potentiometer (worn or water-damaged)
  • Reference voltage shorted to signal (voltage source feeding signal)
  • Poor ground at transmission control module or sensor
  • Transmission control module (TCM/ECU) internal fault

Symptoms

  • MIL/Check Engine lamp illuminated
  • Stored P1875 diagnostic trouble code (may appear with related transmission codes)
  • Incorrect or erratic gear position displayed
  • Transmission hesitates, shifts harshly or defaults to limp mode
  • Vehicle may refuse to shift into certain gears or may be stuck in a single gear
  • Intermittent fault that can be triggered by movement or vibration

What to check

  • Retrieve freeze frame/live data and confirm P1875 and any related transmission codes
  • Visually inspect potentiometer #2 connector and nearby harness for damage, corrosion, fluid, or pin push-out
  • Check for proper connector seating and locking clip engagement
  • Measure reference (Vref) supply to the potentiometer (typically ~5 V) with ignition ON
  • Measure signal voltage from potentiometer #2 at rest and while moving the selector/actuator; note if voltage is above expected maximum
  • Check ground continuity between sensor ground and battery negative/ECM ground

Signal parameters

  • Reference voltage (Vref): typically ~5.0 V (varies by model)
  • Expected potentiometer signal range: approx. 0.2–4.8 V depending on gear position (manufacturer-specific)
  • SRC Up condition: signal higher than allowed upper threshold (often >4.8–5.0 V)
  • Potentiometer resistance: variable with position; check manufacturer spec for exact ohms chart
  • Any absolute voltages depend on vehicle model — confirm with factory service data

Diagnostic algorithm

  1. Connect an OBD-II scanner and record P1875 plus any related codes and freeze frame data
  2. Visually inspect gearbox potentiometer #2, its connector, and wiring for damage, corrosion, or contamination
  3. With ignition ON (engine off) verify Vref at the sensor connector; compare to spec (typically ~5 V). If no Vref, trace back to fuse/TCM/power supply
  4. Measure sensor signal voltage at the connector and move the gear selector/actuator through its range; confirm signal moves smoothly within spec. Note if signal reads above upper limit (SRC Up)
  5. Check sensor ground continuity to chassis/ECU ground; repair any poor grounds
  6. If wiring and connectors pass, disconnect sensor and measure resistance across potentiometer terminals and compare to specification or expected smooth change as shaft moves
  7. Perform wiggle tests on harness while monitoring live data to find intermittent opens/shorts
  8. If harness and connector repairs do not clear the fault, replace the gearbox potentiometer #2 and re-test
  9. After repairs, clear codes and perform road test while monitoring live data to confirm normal operation and that code does not return
  10. If fault remains with correct sensor readings, consider TCM/ECU diagnosis or replacement following manufacturer procedures

Likely causes

  • Damaged insulation at harness causing intermittent short to battery/ignition source
  • Connector contaminated with corrosion or fluid ingress at gearbox potentiometer #2
  • Internal failure of potentiometer (shaft wear, internal short to supply)
  • Pin pushed back or bent in connector causing contact with Vb (battery) rail
  • Poor chassis/engine/transmission ground near sensor causing abnormal readings

Fault status

⚠️ Status
Stored: Gearbox potentiometer #2 circuit — signal above allowed range (SRC Up). Indicates high/over-voltage or short-to-voltage on potentiometer #2 circuit; may cause incorrect gear indication or limp/limited transmission operation.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

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406

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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