Door locks acting erratically. Windows that stop mid-travel. Interior lights that stay on — or refuse to turn on at all. A failing BCM takes your vehicle's electrical systems offline one by one. Our technicians repair body control modules at the board level — tracing failed driver circuits, replacing damaged relay components, and restoring corroded CAN bus connections — at 50–70% less than dealership replacement costs.
Why choose us
Common BCM Problems We Fix
Power windows stop working or operate intermittently across one or more doors
Door locks malfunction — won't respond to key fob, lock/unlock erratically, or lose sync between doors
Interior lights stay on permanently, flicker, or won't illuminate when doors open
Dashboard warning lights for security, theft deterrent, or immobilizer stay on
Windshield wipers run erratically, won't park, or lose delay/intermittent function
Vehicle won't start despite good battery — BCM fails to release immobilizer
Service Value
Cost Savings
A dealership BCM replacement typically runs $800–$2,000 including the part, labor, and reprogramming. Board-level BCM repair costs 50–70% less because we fix the failed components — not swap the entire unit. You keep your original module, which means no additional VIN programming fees and no compatibility risks with aftermarket replacements.
Faster Turnaround
Ordering a replacement BCM through a dealership often means a 5–14 day wait for parts, followed by a separate appointment for installation and programming. Our BCM repairs are typically completed within 24–72 hours. For mail-in customers, total turnaround including shipping averages 5–7 business days.
Your Original Module, Restored
Unlike a replacement, repairing your original BCM preserves all factory configuration data — VIN programming, immobilizer keys, vehicle-specific feature settings, and security codes. There is no need for dealer-level module setup after installation, no risk of losing programmed key fobs, and no "used module" uncertainty. Your module goes back in the way it came from the factory — just with the failed components restored.
Board-Level Expertise
Most shops diagnose a faulty BCM and recommend full replacement. We open the module and repair it at the component level. Here is what that means in practice.
CAN Bus Transceiver Repair
When your scanner shows "no communication" with the BCM, the cause is often a damaged CAN bus transceiver chip or corroded connector pin — not a dead unit. We trace the failure to the specific IC, desolder and replace the transceiver, and verify communication across all vehicle networks including high-speed and low-speed CAN.
Relay Driver Circuit Restoration
The internal relay drivers that control door locks, power windows, and lighting circuits burn out over time — especially in vehicles exposed to voltage spikes or battery issues. We test each driver output individually, identify the failed transistor or MOSFET, and install a replacement rated for extended service life and higher current tolerance.
Power Supply Regulator Repair
The BCM's internal voltage regulators convert vehicle battery voltage to the 5V and 3.3V levels the processor and logic circuits need. When these fail, the module powers down intermittently or refuses to initialize at key-on. We test each power rail under load, identify degraded components, and restore stable internal power delivery.
Immobilizer and Security Circuit Repair
When the BCM fails to release the immobilizer, your vehicle will not start — even with a good battery and a programmed key. We diagnose the specific security circuit failure, repair damaged transponder communication lines, and restore proper key recognition without losing your existing programmed key fob data.
Corrosion and Moisture Damage Repair
Water intrusion through door seals, windshield leaks, or condensation is a leading cause of BCM failure — particularly in Calgary's climate with extreme temperature swings from −40°C to +35°C. We clean affected boards under magnification, remove corrosion from traces and pads, rebuild damaged connections, and apply protective conformal coating against future moisture exposure.
Wiper and Lighting Logic Repair
The BCM manages complex timing logic for wiper delay intervals, automatic headlight control, courtesy light delays, and turn signal sequencing. When the logic circuitry fails, wipers lose their park position, lights behave erratically, or delay functions stop working entirely. We diagnose the specific logic failure and restore proper function at the component level.
Vehicle Makes and Models We Service
Domestic Vehicles
Brand Name
Models
Jeep
Wrangler (JK/JL), Grand Cherokee, Liberty, Compass, Renegade
Dodge/Ram
Ram 1500/2500/3500, Durango, Charger, Dakota, Grand Caravan
Ford
F-150, F-250, F-350, Escape, Expedition, Explorer, Mustang
GM/Chevrolet
Silverado, Sierra, Tahoe, Suburban, Equinox, Traverse
GMC
Sierra 1500/2500/3500, Terrain, Acadia, Yukon
Lincoln
Navigator, MKX, MKZ
Pontiac/Buick
Grand Prix, Enclave, LaCrosse
Cadillac
Escalade, CTS, SRX
Asian Vehicles
Brand Name
Models
European Vehicles
Brand Name
Models
Real Customers, Real Savings
Don't just take our word for it. See how Module Masters has helped thousands of customers save money while getting their vehicles back on the road quickly and reliably.
FAQ'S
Can a faulty BCM be repaired, or does it need to be replaced?
In most cases, yes — BCMs can be repaired. The most common failures are specific electronic components on the circuit board: relay drivers, CAN bus transceivers, power supply regulators, or logic ICs. We repair these at the component level, which restores full BCM function without replacing the entire unit. In rare cases where the circuit board has catastrophic damage from severe water intrusion or physical impact, replacement may be the only option — and we will tell you that upfront before any charges.
How do I know if my BCM is the problem?
Will my vehicle still drive with a faulty BCM?
Do I need to reprogram the module after your repair?
My BCM failed after a battery replacement or jump start. Can you fix this?
Can you program a used or replacement BCM to my vehicle?
What vehicle makes do you service?