Toggle Side Panel

Shopping Cart

No products in the basket.

Shopping Cart

No products in the basket.

Close search
Home / DTC / B28B8 — RR P/W initialization

B28B8 — RR P/W initialization

Detailed page for trouble code B28B8.

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

B28B8

MITSUBISHI B — Body

RR P/W initialization

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

Causes

  • Failed or interrupted auto-initialization/learning procedure
  • Faulty RR power window switch
  • Defective window motor or regulator (mechanical binding)
  • Open/short in wiring or poor connector/ground at door harness
  • Blown fuse or faulty power/ground supply
  • Faulty body/control module for power windows (door ECU)

Symptoms

  • Rear-right window one-touch auto-up/auto-down does not work
  • RR window does not respond or only moves manually/intermittently
  • Window operation is slow, noisy, or stops mid-travel
  • Other windows operate normally (problem isolated to RR)
  • DTC present in body/power-window module and auto features disabled

What to check

  • Confirm code with appropriate scan tool and read freeze-frame or related codes
  • Attempt manufacturer's RR window initialization/relearn procedure
  • Verify battery voltage and fuses for power-window circuit
  • Operate RR switch while observing motor voltage and current
  • Inspect door harness, connectors, and ground for corrosion or damage
  • Check for mechanical binding by moving the glass manually (with power disconnected) and inspecting regulator

Signal parameters

  • Supply voltage at switch/motor: ~12 V (engine off), 13–14 V (engine running)
  • Command signal from switch to module: logical on/off (0 V / ~12 V) depending on design
  • Motor current draw: short surge on start then steady; significant overcurrent (>10–15 A) suggests binding or short (manufacturer-specific values may vary)
  • Continuity/resistance across motor terminals when stationary: low ohms (motor coil), open = motor fault
  • CAN/bus: module should respond to diagnostic requests (status = active/connected)

Diagnostic algorithm

  1. Verify DTC B28B8 with a scan tool and note any other related codes; record vehicle specifics and battery voltage.
  2. Attempt the factory RR power-window initialization/relearn procedure exactly as specified in the service manual; re-check for code after attempt.
  3. Check fuses and inspect wiring/connectors at the RR door and door jamb; repair any corrosion or damage.
  4. With ignition on, operate the RR switch and measure voltage at the switch output and at the motor connector to confirm power and direction signals.
  5. Measure motor current while operating; an excessive current or no current helps distinguish mechanical binding vs. electrical open condition.
  6. If switch signals are present but motor not responding, bench-test or temporarily jump power to the motor (safely) to verify motor/regulator operation.
  7. If motor and regulator are OK, verify inputs/outputs and grounds at the power-window control module; consider swapping or replacing module if diagnostics indicate internal fault.
  8. After repairs, perform the initialization/relearn procedure again. Clear codes and test full function of RR window multiple cycles.
  9. If intermittent, flex the door harness through full travel to reproduce the fault while monitoring signals to locate a wiring break at the hinge area.

Likely causes

  • Interrupted or failed initialization sequence (user/battery disconnect)
  • Faulty RR window switch or connector
  • Mechanical binding or seized regulator/motor causing abnormal current
  • Damaged wiring in door harness (flex point) or poor ground
  • Faulty power-window control module

Fault status

⚠️ Status
RR power window initialization failure — auto learn/calibration unsuccessful; RR auto up/down may be disabled.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B2800 B2810 B2820 B2830
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 .