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Home / DTC / B28BA — FL P/W default

B28BA — FL P/W default

Detailed page for trouble code B28BA.

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Code

B28BA

MITSUBISHI B — Body

FL P/W default

Brand: MITSUBISHI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Battery disconnected or low voltage during initialization
  • Failed or stuck front-left window switch
  • Front-left window motor or regulator mechanical binding
  • Wiring harness damage, poor connector or ground at the front-left door
  • Blown fuse or relay for power windows
  • Body/BCM (body control module) software or internal fault

Symptoms

  • Auto up/down or one-touch function for front-left window disabled
  • Window does not return to known home position after ignition cycle
  • Front-left window operates intermittently or not at all
  • Unusual noise or slow movement when operating that window
  • DTC B28BA recorded in body ECU or power window control module

What to check

  • Read and record all stored DTCs and freeze frame with an appropriate scan tool
  • Note conditions when code set (after battery disconnect, during operation, after collision)
  • Visually inspect fuses/relays for the power window circuit
  • Inspect door harness connector for corrosion, bent pins or water ingress
  • Operate the front-left window while watching/feeling for binding or obstructions
  • Check switch operation: verify continuity/resistance changes when actuated

Signal parameters

  • Ignition-on battery supply to window circuit: ~11–14.5 V
  • Switch output: near battery voltage when pressed in drive direction, near 0 V in opposite direction (or short-to-ground depending on design)
  • Motor coil resistance: low (typically a few ohms) — expect low ohms continuity, open indicates fault
  • Motor current: can spike to high amperage under load (stall current); large unexpected current may indicate binding
  • CAN/lin communication: body ECU should show valid status for window module (no communication errors)

Diagnostic algorithm

  1. Connect an OEM-level scan tool, read and record B28BA and any related codes; note freeze-frame/conditions. 2) Check battery voltage and charging system; ensure stable supply (perform tests with engine running and key ON). 3) Visually inspect front-left door harness connector, switch connector and BCM connectors; repair any corrosion/loose pins. 4) Verify fuses and relays for the power window circuit; replace if blown. 5) Attempt initialization/default (manufacturer re-learn) procedure per service manual; observe whether DTC returns. 6) Test switch operation: check continuity or switch outputs while actuating; replace switch if outputs are missing/erratic. 7) Test motor/regulator: with the door panel removed, operate the window and observe movement; check motor resistance and apply bench 12 V to motor briefly (with caution) to verify operation. 8) Check for mechanical binding or an off-track regulator and repair or replace regulator if needed. 9) Inspect and measure supply and ground at the motor connector during operation to confirm proper power delivery. 10) If wiring and components test OK, check body/BCM software version and communications; consider reflashing or replacing module per service procedures. 11) Clear codes and re-run the default/learn procedure; verify the fault does not return and the auto-up/down function works correctly.

Likely causes

  • Failed auto-learn after battery service or ECU replacement
  • Intermittent or open power/ground to the front-left window motor/switch
  • Mechanical binding of the regulator or window off-track
  • Faulty front-left window switch
  • Damaged connector or pin corrosion at the door harness

Fault status

⚠️ Status
Front-left power window default/initialization failure detected. Auto one-touch or default position functionality disabled until re-learn or repair. Inspect switch, motor/regulator, wiring and perform re-initialization per service manual.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B28B0 B28B1 B28C0 B28A0 B2830
406

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