What Does B1867 Mean?
This code indicates that the Body Control Module (BCM) or a related control module has detected an abnormal short-to-ground condition in the battery power supply circuit feeding an Electronic Control Unit (ECU). The monitoring system detected voltage levels below expected threshold, indicating current is flowing directly to ground instead of through the intended circuit. This typically affects multiple electrical systems as the power supply integrity to one or more control modules is compromised.
Common Causes
45%
Damaged, chafed, or pinched wiring harness creating direct ground contact in the ECU power supply circuit
25%
Corroded or moisture-damaged ECU connector pins causing internal short to ground
20%
Failed or internally shorted ECU with compromised power supply input stage
10%
Damaged fuse box or distribution block with internal short in ECU power feed circuit
Diagnostic Steps
1
Step 1: Perform visual inspection of ECU power supply wiring harness from battery/fuse box to ECU connector, checking for chafing, pinch points, heat damage, or exposed copper wire particularly at sharp edges, routing clips, and grounding points
2
Step 2: Disconnect the affected ECU connector and inspect pins for corrosion, pushed-back terminals, moisture intrusion, or physical damage. Use multimeter to measure resistance from ECU power supply pin to ground with harness-side connector disconnected (should read >10k ohms; low resistance indicates wiring short)
3
Step 3: Check voltage at ECU power supply circuit at the harness connector with ignition on (should match battery voltage, typically 12-14V). If voltage is present at connector but code persists, suspect internal ECU failure
4
Step 4: Inspect fuse box and power distribution center for signs of overheating, melted components, or corrosion at the ECU power supply fuse location. Test fuse holder integrity and check for voltage drop across connections
5
Step 5: If wiring and connections test normal, perform ECU power consumption test by measuring current draw with ammeter in series (typical draw 50-500mA depending on module). Excessive current indicates internal ECU short
6
Step 6: After repair, clear codes, cycle ignition, and perform functional test of all systems controlled by the affected ECU. Monitor live data for proper voltage levels and verify code does not return
Estimated Repair Cost
$100 - $1,200
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) or a related control module has detected an abnormal short-to-ground condition in the battery power supply circuit feeding an Electronic Control Unit (ECU). The monitoring system detected voltage levels below expected threshold, indicating curre...
The most common cause of B1867 (Battery Power Supply ECU Circuit Short To Ground) is: Damaged, chafed, or pinched wiring harness creating direct ground contact in the ECU power supply circuit
Typical repair costs for B1867 range from $100 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may be drivable but could experience intermittent electrical failures, loss of critical safety systems, or complete shutdown of affected control modules. Repair should be completed promptly to prevent cascading electrical damage and ensure reliable operation of safety-related systems.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1867 to identify the root cause.
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Quick Info
Category
Body
System
Body Control and Power Distribution System
Difficulty
Type
Manufacturer
Recommended Tools
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