B3290

Code

Generic B — Body

Body Control Module Internal Memory Error

Brand: Generic

Type: B — Body

Views: UK: 7 EN: 15 RU: 7

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Corrupted BCM flash or EEPROM (software image or calibration data)
Interruption during programming or software update
Low or unstable battery/voltage during module access
Failed or failing BCM hardware (internal memory or processor faults)
Poor power/ground connections, wiring damage or corrosion
Water intrusion, heat damage, or physical contamination

Symptoms

Multiple body-system failures (doors, locks, lights, wipers, windows)
Intermittent or permanent loss of convenience features
Instrument cluster warnings or message about module failure
Loss of communication with BCM on CAN/serial bus
Learned settings (radio presets, seat memory) lost or reset
Vehicle may not go to sleep or may have excessive battery drain

What to check

Read all stored DTCs from BCM and other network modules; note freeze frame data and event counters
Check battery state-of-charge and voltage (key off and during cranking); verify good battery health
Inspect BCM connectors and harness for corrosion, bent pins, water, or damage
Verify primary power and ground circuits to BCM for proper voltage and low resistance
Check for aftermarket devices tied into body wiring (alarms, remote starts) and disconnect for test
Scan CAN bus for communication errors, bus-off conditions, or related U-codes

Signal parameters

Supply voltage to BCM: expected ~12.0–14.5 V (key on/crank vary within spec)
Ground resistance:
CAN bus activity: normal transmit/receive message rates per network (no bus-off)
Module wake/sleep current per manufacturer spec (no excessive draw)
Error counters or checksum/ECC status reported by BCM (where available)

Diagnostic algorithm

Capture all DTCs and network U-codes; record freeze frame/event data.
Verify battery voltage and charge if low. Recheck with a known-good battery if needed.
Visually inspect BCM, mounting area, and connectors for water, corrosion, or physical damage.
Verify constant and switched power feeds and ground continuity to the BCM; repair any high resistance.
Check CAN bus/communication with other modules; isolate bus segments if necessary to identify faults.
If an interrupted reflash is suspected, attempt a soft reset (clear codes, key cycle). If available, perform manufacturer-specified BCM reset procedure.
Reprogram/reflash the BCM with the latest OEM software and proper calibration using dealer or factory tools. Ensure stable power during programming (battery charger or maintenance power).
After reflash, clear codes and test all affected functions; monitor for reappearance of B3290.
If reprogramming fails or code returns immediately and hardware checks good, consider BCM replacement and program new module with vehicle-specific configuration and security coding.
Retest vehicle over several key cycles and drive conditions; verify no related network faults and no battery drain issues.

Likely causes

Corrupted firmware caused by interrupted reprogramming or power loss
Weak battery or poor battery connections during a module event
Failed BCM memory cell(s) requiring module replacement
Loose/oxidized ground or power feed creating intermittent resets
Failed solder joint or connector pin in BCM harness

Fault status

⚠️ Status

Internal memory/self-test failure detected in Body Control Module (checksum/ECC error or corrupted flash/EEPROM). Module may require reprogramming or replacement.

🔴 Repair difficulty: Hard

⏱️ Diagnostic time: 1.5-4.0 hours