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Home / DTC / P1607 — Battery backup line system(T/M)

P1607 — Battery backup line system(T/M)

Detailed page for trouble code P1607.

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Code

P1607

MITSUBISHI P — Powertrain

Battery backup line system(T/M)

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

Causes

  • Weak or discharged vehicle battery
  • Loose or corroded battery positive/negative terminals
  • Blown fuse or fusible link for backup/constant power circuit
  • Open, short to ground, or high-resistance in backup power wiring or connectors
  • Poor ground for transmission control module or related ground strap
  • Faulty transmission control module (TCM)

Symptoms

  • Malfunction Indicator Lamp (MIL) or transmission warning lamp illuminated
  • Possible transmission limp/secure mode or altered shift behavior
  • Loss of learned shift/adaptive memory after battery removal or intermittent power
  • Difficult starting or stored related electrical voltage codes
  • Intermittent operation of transmission functions

What to check

  • Check and record battery resting voltage (should be ~12.4–12.8 V when fully charged)
  • Inspect battery terminals and cable connections for corrosion and tightness
  • Check main fuses, fusible links and any TCM power fuses for continuity
  • Visually inspect wiring harness and connectors between battery and TCM for damage
  • Check ground connections for tightness and cleanliness at battery and TCM
  • Scan for additional codes and freeze frame data

Signal parameters

  • Battery resting voltage: ~12.4–12.8 V (after charge, engine OFF)
  • Charging voltage with engine running: ~13.5–14.8 V
  • TCM backup/constant power pin (ignition OFF): near battery voltage (no large drop)
  • Voltage drop on backup circuit under load: should be low (
  • Continuity: near 0 ohms between battery positive (fused feed) and TCM backup terminal (with power removed and fuses bypassed per service manual)

Diagnostic algorithm

  1. Read and record P1607 plus any other stored DTCs and freeze-frame data using a diagnostic scan tool.
  2. Verify battery state of charge and charging system function. Charge or replace weak battery and re-test.
  3. Inspect and clean battery terminals, cable clamps and main grounds. Tighten connections to spec.
  4. Check fuses and fusible links protecting the TCM constant power circuit; replace any blown items and retest.
  5. With battery and ignition OFF, visually inspect and wiggle the wiring harness and connectors from the battery to the TCM for damage or loose pins.
  6. Measure voltage at the TCM backup/constant power terminal with ignition ON and OFF. Compare to battery voltage. Look for excessive voltage drop or loss of continuity.
  7. Check continuity and resistance of the backup power wire to the battery positive (remove fuses as required). Repair wiring or connector faults found.
  8. Inspect and verify TCM ground(s). Repair any high-resistance grounds.
  9. If wiring, fuses and battery are good but fault persists, follow manufacturer procedure for bench/adapter testing of the TCM or consider replacement per service manual.
  10. After repairs, clear codes and perform a road/test cycle and re-scan to confirm the fault does not return.

Likely causes

  • Blown fuse or fusible link protecting the backup/constant power feed
  • Loose/corroded battery terminal or poor battery condition
  • Open or high-resistance connection in the backup power wire between battery and TCM
  • Faulty ground at TCM or battery negative
  • Intermittent connector or wiring damage near battery or TCM

Fault status

⚠️ Status
Battery backup line circuit fault detected for the transmission control module — open, short, intermittent connection, or low/high voltage on the constant power feed.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P1600 P1601 P1604 P1606 P0562 P0563
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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