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Home / DTC / P1896 — Gearbox drive unit(SRC low)

P1896 — Gearbox drive unit(SRC low)

Detailed page for trouble code P1896.

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Code

P1896

MITSUBISHI P — Powertrain

Gearbox drive unit(SRC low)

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

Causes

  • Open or shorted SRC signal wire (short to ground)
  • Poor or corroded connector or terminal at gearbox drive unit or TCM
  • Low battery or poor battery/charging system voltage during test
  • Faulty gearbox drive unit (SRC sensor/actuator) or internal failure
  • Faulty Transmission Control Module (TCM) or related ECU
  • Software/firmware issue in TCM requiring reflash

Symptoms

  • Transmission fault lamp or MIL illuminated
  • Erratic shifting, delayed or harsh gear changes
  • Transmission may go into limp/reduced‑speed mode
  • No shift or stuck in single gear
  • Stored transmission-related fault codes in addition to P1896
  • Occasional or permanent loss of drive

What to check

  • Retrieve freeze frame data and full code list with a proper scan tool
  • Check battery and charging system voltage (key ON, engine OFF and running)
  • Visually inspect transmission wiring harness and connectors for damage or corrosion
  • Backprobe SRC signal and ground pins with key ON and during operation where safe
  • Check continuity and resistance of SRC circuit to the TCM; look for shorts to ground or power
  • Wiggle test harness while monitoring live data to reproduce fault

Signal parameters

  • SRC signal type: low/analog or logic-level signal reported low (vehicle-specific)
  • Typical reference: 0–5 V signal range (consult factory manual for exact thresholds)
  • SRC low condition: voltage at SRC terminal measured near 0–0.5 V (indicates low)
  • Normal operating range: commonly ~0.5–4.5 V depending on vehicle and gear selection
  • Battery/ignition supply: ~12 V (key ON) — ensure proper supply to gearbox drive unit
  • Communication: verify TCM receives transmission messages over CAN if applicable

Diagnostic algorithm

  1. Read and record all DTCs and freeze-frame data. Clear codes and attempt to re-create the fault to confirm persistence.
  2. Verify battery voltage and charging system; ensure stable supply during testing (>12 V key ON).
  3. Perform a visual inspection of gearbox drive unit connectors, pins and wiring for corrosion, bent pins, water ingress or mechanical damage.
  4. Using wiring diagrams, identify SRC signal, power and ground pins. Backprobe the connector with key ON and measure voltages at rest and while operating (where safe).
  5. Check for continuity and resistance between the gearbox drive unit SRC pin and the TCM connector. Check for short to ground or power.
  6. Wiggle the harness and connectors while monitoring the SRC signal and watch for intermittent drops or changes that reproduce the code.
  7. If wiring and connector tests are within specification, swap or bench-test the gearbox drive unit if a known-good unit is available, or consult factory tests for the component.
  8. If component tests are good, inspect/diagnose the TCM: check for communication faults, reflash/repair per manufacturer procedures or replace if confirmed faulty.
  9. After repairs, clear codes and perform a road/test drive cycle with live-data monitoring to confirm the fault is resolved.
  10. If uncertain, consult Mitsubishi factory service information and wiring diagrams; consider specialized transmission diagnostic tools.

Likely causes

  • Damaged or corroded connector at gearbox drive unit (most common)
  • Open or short in the SRC signal harness
  • Failed gearbox drive unit (sensor/actuator) after wiring checks
  • Poor ground or low battery during diagnosis
  • TCM fault or communication error (less common)

Fault status

⚠️ Status
Gearbox drive unit SRC circuit low — voltage on SRC signal circuit is below expected range or shorted to ground, causing transmission fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

Similar codes

P0700 P0705 P0715 P0720 P0730 P1890
406

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