What Does B2250 Mean?
This code indicates the Body Control Module (BCM) has detected a fault in the all-doors unlock relay circuit. The BCM monitors this circuit and sets the code when it detects an open circuit, short circuit, or relay malfunction preventing proper operation of the power door unlock function. This affects the vehicle's central locking system and prevents all doors from unlocking simultaneously via the key fob or door switches.
Common Causes
40%
Faulty all-doors unlock relay with internal contacts burned, corroded, or stuck
30%
Wiring harness damage including broken wires, chafed insulation, or corroded connections between BCM and unlock relay
20%
Blown fuse or fusible link in the door unlock circuit power supply
10%
Failed Body Control Module with internal relay driver circuit failure
Diagnostic Steps
1
Step 1: Locate the all-doors unlock relay in the fuse/relay box (consult service manual) and perform a visual inspection for corrosion, burning, or physical damage. Check relay socket terminals for corrosion or loose fit.
2
Step 2: With ignition on, command the unlock relay through active test function using diagnostic tool while listening/feeling for relay click. Use a multimeter to measure voltage at relay coil terminals (should see battery voltage when commanded) and load side (should show battery voltage when relay closes).
3
Step 3: Remove relay and test for continuity across relay contacts in both energized and de-energized states using bench power supply and multimeter. Replace relay if contacts show open circuit or excessive resistance (>0.5 ohms).
4
Step 4: If relay tests good, check fuse integrity with multimeter for continuity and inspect all wiring between BCM connector and relay socket for damage, shorts to ground, or open circuits. Pay special attention to wire routing through door hinges and under carpet areas.
5
Step 5: Inspect BCM connector terminals for corrosion, pushed-back pins, or moisture intrusion. Check BCM ground circuits for less than 0.1 ohms resistance to chassis ground.
6
Step 6: Clear codes, perform lock/unlock function test using both key fob and door switches, and verify proper operation. Monitor live data for relay command signal from BCM during testing to confirm repair.
Estimated Repair Cost
$75 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a fault in the all-doors unlock relay circuit. The BCM monitors this circuit and sets the code when it detects an open circuit, short circuit, or relay malfunction preventing proper operation of the power door unlock function. This affec...
The most common cause of B2250 (All Doors Unlock Relay Circuit Failure) is: Faulty all-doors unlock relay with internal contacts burned, corroded, or stuck
Typical repair costs for B2250 range from $75 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive with this code. The main inconvenience is loss of convenient all-doors unlock function, requiring manual unlocking of individual doors. This is not a safety hazard but should be repaired for security and convenience reasons.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2250 to identify the root cause.
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Quick Info
Category
Body
System
Body Control System / Central Door Locking
Difficulty
Type
Generic (SAE)
Recommended Tools
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