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Home / DTC / B29A6 — Manufacturer-specific DTC — consult service manual

B29A6 — Manufacturer-specific DTC — consult service manual

Detailed page for trouble code B29A6.

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Code

B29A6

MITSUBISHI B — Body

Manufacturer-specific DTC — consult service manual

Brand: MITSUBISHI
Type: B — Body
Views: UK: 16 EN: 26 RU: 25
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Page language: EN

Causes

  • Manufacturer-specified internal module fault
  • Intermittent or damaged wiring/harness or connector corrosion
  • Poor battery or low supply voltage
  • CAN or LIN bus communication error
  • Software/configuration error or corrupted module data
  • Water intrusion or physical damage to components

Symptoms

  • Illumination of a related body/system warning lamp or message
  • Intermittent or complete malfunction of the associated body function (locks, lights, convenience features, etc.)
  • Stored freeze-frame and related communication U-codes in the scan tool
  • Symptoms may be intermittent and/or occur after water exposure or vibration

What to check

  • Read all manufacturer codes and freeze-frame data with an advanced scan tool; record related U- and C-codes
  • Consult Mitsubishi service manual for B29A6 definition and the official diagnostic flowchart
  • Check battery state of charge and system voltage at rest and while cranking
  • Scan CAN/LIN network for errors and verify communication with all modules
  • Visually inspect connectors and wiring in the circuit related to the failing function for corrosion, damage, or water intrusion
  • Perform wiggle tests on harnesses while monitoring live data for changes

Signal parameters

  • Battery voltage at module (expected ~12.0–14.5 V with engine running)
  • Module ground resistance (
  • CAN High/CAN Low bus voltages (idle ~2.5 V differential; CANH ~2.5 V, CANL ~2.5 V)
  • Data packet frequency and error counters from scan tool (bus errors, message loss)
  • Module wake/sleep signals and LIN bus responses (if applicable)

Diagnostic algorithm

  1. Use a compatible Mitsubishi or OEM-level scan tool and capture all stored codes and freeze-frame data; note time and conditions when code set
  2. Consult the vehicle’s service manual for the exact definition of B29A6 and follow the manufacturer diagnostic flowchart
  3. Verify battery and charging system condition; ensure adequate voltage during diagnostics
  4. Check for related network (CAN/LIN) codes; isolate and repair any network faults first
  5. Visually inspect connectors, wiring, and harnesses for damage, corrosion or signs of water entry; repair or replace as needed
  6. Measure power and ground at the suspected module connector; repair high resistance or open circuits
  7. If the fault is communication-related, use an oscilloscope or data logger to capture bus signals and identify noise or missing messages
  8. If wiring and power/ground are good and diagnostic flow directs, update or reflash module software per service bulletin instructions
  9. Clear codes and perform function tests and a road test to confirm repair; monitor for return of the code
  10. If the code persists after wiring and software checks, follow manufacturer guidance for module replacement and post-repair programming

Likely causes

  • Loose, corroded or disconnected connector at the related module
  • Open/short in supply or ground circuit to the module
  • Faulty body control module (BCM) or related control unit
  • Loss of CAN/LIN network communication due to faulted node or wiring
  • Recent aftermarket installation interfering with wiring or network

Fault status

⚠️ Status
Manufacturer-specific DTC. The code definition, set conditions, and detailed repair procedure are provided in the Mitsubishi service manual or technical service bulletins. Consult official documentation before parts replacement.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.5 hours

Similar codes

B29A0 B29A1 B29A2 B29A3 B29A4 B29A5
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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