Toggle Side Panel

Shopping Cart

No products in the basket.

Shopping Cart

No products in the basket.

Close search
Home / DTC / B294A — Body Control Module Internal Fault

B294A — Body Control Module Internal Fault

Detailed page for trouble code B294A.

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

B294A

MITSUBISHI B — Body

Body Control Module Internal Fault

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

Causes

  • BCM internal hardware or software failure
  • Low or unstable battery/supply voltage to the BCM
  • Poor ground or corroded connector pins at BCM
  • CAN/LIN bus communication errors or open/shorted wiring
  • Water intrusion or physical damage to BCM
  • Blown fuse or faulty relay powering BCM circuits

Symptoms

  • BCM-related functions intermittent or inoperative (central locking, lights, wipers, interior lighting, keyless entry)
  • Instrument cluster or dash warning lamp(s) illuminated (BCM/ABS/airbag/communication warnings)
  • Loss of communication with other modules on scan tool
  • Unusual accessory behavior or random faults that clear after restart
  • Vehicle may fail immobilizer or not recognize key (in some models)

What to check

  • Read freeze frame and full module freeze/extended data with a factory-level or full-function scanner
  • Check battery state-of-charge and charging system (restored battery to >12.4 V before tests)
  • Inspect BCM connectors and wiring for corrosion, bent pins, water ingress, and secure fit
  • Check fuses and relays related to BCM power/ignition circuits
  • Scan other controllers for related communication (U-codes) or concurrent faults
  • Perform a visual inspection of the BCM mounting area for moisture or physical damage

Signal parameters

  • Battery/ignition supply voltage to BCM: typically 11–14.5 V during operation
  • Ground integrity: low resistance to chassis (
  • CAN High/Low idle voltages: approx. CAN_H ~2.5–3.5 V, CAN_L ~1.5–2.5 V (differential ~2 V)
  • CAN bus termination: ~60 ohm between CAN_H and CAN_L at key-off/standby (check across network ends)
  • LIN bus idle voltage (if used): near battery voltage through pull-up (model dependent)
  • BCM internal self-diagnostic status codes or module voltage/current draw (compare to spec)

Diagnostic algorithm

  1. Retrieve all freeze frame data and full trouble code list from BCM and other modules. Record occurrence conditions and any U-codes.
  2. Check and restore battery charge to service level. Re-scan for the code with stable battery voltage.
  3. Visually inspect BCM connectors and harness for corrosion, water, damage, pin/backout. Wiggle-test connections with ignition on and observe for changes.
  4. Verify fuses/relays supplying BCM and measure supply voltage at the BCM power pins with ignition positions (B+, IG). Check ground(s) resistance to chassis.
  5. Scan CAN/LIN bus: check for other modules losing communication, measure CAN_H/CAN_L idle voltages and bus differential, and check termination resistance. Repair any wiring faults.
  6. If wiring/power/communication are confirmed good, attempt to clear the code and reproduce. If code returns immediately or intermittently with no external cause, suspect BCM internal fault.
  7. Check for available software updates or TSBs; perform BCM reprogram/flash if an update is available and recommended.
  8. If reprogramming fails or code persists after verifying vehicle wiring and communications, consider replacement of the BCM. Replace with correct part number and program/configure to vehicle using factory-level tool.
  9. After repair or replacement, recheck for stored codes, perform full network scan, and verify all BCM-controlled functions operate normally before returning vehicle.

Likely causes

  • Corroded/loose BCM connector or pin causing intermittent contact
  • Battery low voltage during ignition/self-test (below ~11V)
  • CAN bus termination problem or short to battery/ground on CAN lines
  • BCM internal memory corruption or failed component
  • Recent jump start, improper battery disconnect, or failed software update

Fault status

⚠️ Status
Body Control Module internal fault detected — BCM self-diagnostic reported an internal malfunction. Verify power, ground, communications, and module software before replacement.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1-3 hours

Similar codes

B2940 B2941 U0100 U0073 U0140
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 .