B00FF

Code

Generic B — Body

Body Control Module Internal Fault

Brand: Generic

Type: B — Body

Views: UK: 11 EN: 15 RU: 10

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Multiple unrelated body systems fail or behave erratically (locks, lighting, wipers, HVAC controls)
No response or limited response to keyless entry or remote functions
Interior lights, dash messages or warning LED indicating module fault
Scan tool reports B00FF or shows no/limited communication with BCM
Parasitic battery drain when vehicle is off
Intermittent operation of several body controllers rather than a single circuit

Read all stored and pending DTCs and freeze frame data from BCM and other network modules
Verify battery state-of-charge and system voltage (engine off and cranking)
Check BCM power and ground circuits for proper voltage and good connections
Inspect BCM connector and wiring for corrosion, bent pins, water intrusion or damage
Check for related communication codes (CAN/UART/LIN) that indicate bus issues
Look for recent repair history, jump-starts, aftermarket accessories or water exposure

Battery supply to BCM: nominal 12.0–14.5 V (engine running) ; should not drop below ~9 V during key-on events
Ground resistance: near 0 Ω to chassis (low milliohms); high resistance may cause resets
CAN bus idle (recessive): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V; dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential present)
LIN bus: typically pulled to battery voltage with dominant low; check expected idle voltage per manufacturer
Module wake/sleep signals: check ignition and wake lines per wiring diagram for correct active states

Record all codes and freeze frame; check for related network (Uxxx) codes. Do not clear codes yet.
Verify battery voltage and perform a battery load test if voltage is low. Recharge or replace battery if necessary.
Visually inspect BCM and connector for water, corrosion, heat damage or physical impact. Repair or replace corroded connectors.
With keys off, disconnect BCM connector and check for proper supply and ground at the harness side using a DVOM. Repair any open/shorts before reconnecting.
Scan the CAN/LIN network for communication and bus errors. Measure CAN_H/CAN_L voltages with a scope or DVM; locate short or termination faults if voltages are out of range.
If power/ground and bus are good, attempt a software query/ID of the BCM. Check for available software updates or known firmware issues from the manufacturer.
If supported, try a controlled module reset or reflash using manufacturer-approved scan tool and firmware. Follow exact reprogramming procedure and ensure stable power supply during reflash.
If reflash fails or faults persist and all external wiring/voltage checks are good, consider replacing the BCM with a known-good unit and perform programming/coding per manufacturer procedures.
After repair or replacement, clear codes and verify function of all affected systems; road test and monitor for reoccurrence.

Failed BCM power regulator or voltage transient damage
Corrupted firmware after failed update or interrupted reprogramming
Damaged connector pins or water-corroded terminals
Loss of CAN/LIN bus termination or short to battery/ground affecting module operation
High resistance ground causing intermittent internal resets