Toggle Side Panel

Shopping Cart

No products in the basket.

Shopping Cart

No products in the basket.

Close search
Home / DTC / B1727 — Supply voltage

B1727 — Supply voltage

Detailed page for trouble code B1727.

34,373codes
59brands
11,882generic
22,491specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
Reset
Code

B1727

MITSUBISHI B — Body

Supply voltage

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

Causes

  • Low battery state of charge or poor battery condition
  • Faulty or weak alternator/charging system
  • Blown fuse or faulty supply relay for the affected module
  • Loose, corroded or damaged battery terminals or ground connections
  • Wiring harness damage (open, short to ground or short to B+) at the module power input
  • Poor connector pin contact or moisture/corrosion at the module connector

Symptoms

  • Illumination of warning lamp(s) related to the affected system or ECU
  • Intermittent or complete loss of function for features controlled by the module
  • Stored B1727 code and possibly other electrical/system voltage codes
  • Vehicle may crank slowly or show electrical malfunctions if charging/battery affected
  • Fuses may blow repeatedly or operation works only with ignition in a certain position

What to check

  • Scan for B1727 plus any other stored codes and read freeze-frame/DT data
  • Measure battery voltage at rest and while cranking with a digital multimeter
  • Measure charging system voltage with engine running (expect ~13.5–14.8 V)
  • Visually inspect battery terminals, ground straps and engine/body grounds for corrosion or looseness
  • Inspect and test fuses and relays that feed the affected module; check for high resistance
  • Inspect module connector for corrosion, bent pins, water intrusion or loose terminals

Signal parameters

  • Normal battery/rest voltage: ~12.4–12.8 V
  • Normal charging voltage (engine running): ~13.5–14.8 V
  • Minimum acceptable cranking voltage: typically >9.5–10.5 V (vehicle-dependent)
  • Module supply expected range: typically ~11–15 V (varies by model and module)
  • Rapid voltage drops, spikes, or open/unavailable supply are abnormal

Diagnostic algorithm

  1. Connect a diagnostic scanner and record B1727 and any related codes; note freeze-frame data and supplied voltage values if available.
  2. With vehicle off, inspect battery condition and clean/tighten battery positive and negative terminals and main ground points.
  3. Measure battery voltage at the battery posts. If below ~12.2 V, charge battery and retest; replace if it fails to hold charge.
  4. Start engine and measure charging voltage at the battery. If outside ~13.5–14.8 V, diagnose charging system (alternator, regulator, belts, connections).
  5. Locate the power feed fuse/relay for the affected module; check continuity and voltage at the fuse with ignition ON. Replace fuse/relay if faulty.
  6. Back-probe the module power input terminal(s) and monitor voltage while cycling ignition and operating related functions. Note any intermittent loss or voltage spikes.
  7. Inspect wiring harness and connector for damage or corrosion. Repair open/shorted wiring and replace corroded connectors or terminals.
  8. If supply wiring and vehicle voltage are good but the module still reports abnormal supply, consider module internal failure; confirm with manufacturer service info before replacing.
  9. After repairs, clear codes, perform a functional test and road test to ensure the fault does not return; if B1727 returns, proceed to advanced electrical diagnostics or dealer-level resources.

Likely causes

  • Bad battery or low charge causing voltage to drop below expected level
  • Corroded/loose main ground or battery terminal causing intermittent supply
  • Blown or high-resistance fuse/relay feeding the module
  • Short to ground or open in the power feed harness to the module
  • Faulty module failing to regulate or detect its supply correctly

Fault status

⚠️ Status
Supply voltage abnormality detected — module supply voltage outside expected range or intermittent. Check battery, charging, fuses, grounds and module power wiring.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0562 P0563 P0627 B1726 B1728
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 .