What Does B2474 Mean?
This code indicates the Body Control Module (BCM) has detected an abnormal short-to-ground condition in the passenger door lock switch circuit. The BCM monitors the electrical signal from the passenger door lock switch and has identified that the circuit voltage is being pulled to ground when it shouldn't be, preventing normal lock/unlock operation. This typically occurs when damaged wiring insulation, a faulty switch, or corrosion creates an unintended path to vehicle ground.
Common Causes
40%
Damaged, chafed, or pinched wiring in the passenger door harness causing insulation breakdown and direct contact with ground
30%
Failed passenger door lock switch with internal short circuit to ground
20%
Water intrusion or corrosion in door lock switch connector causing short to ground through corrosion path
10%
Faulty Body Control Module with internal circuit failure on the door lock switch input channel
Diagnostic Steps
1
Step 1: Perform visual inspection of passenger door lock switch and connector for obvious damage, corrosion, water intrusion, or bent pins. Disconnect the switch connector and inspect terminals for corrosion or pushed-back pins.
2
Step 2: Using a digital multimeter, measure resistance between the door lock switch signal wire (at the BCM side with switch disconnected) and vehicle ground. Reading should be infinite ohms (open circuit); any measurable resistance indicates a short to ground in the wiring.
3
Step 3: Inspect the door harness boot area between door jamb and door body for pinched, chafed, or damaged wires. Flex the harness while monitoring resistance to ground to identify intermittent shorts. Check for wire damage where harness passes through metal grommets.
4
Step 4: If wiring tests good, test the door lock switch itself by measuring resistance across switch terminals per manufacturer specifications. A shorted switch will show low resistance to ground on the signal circuit regardless of switch position.
5
Step 5: Repair or replace identified faulty components (wiring, connector, or switch). Clear codes and verify repair by operating the passenger door lock switch multiple times while monitoring for code recurrence.
Estimated Repair Cost
$75 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an abnormal short-to-ground condition in the passenger door lock switch circuit. The BCM monitors the electrical signal from the passenger door lock switch and has identified that the circuit voltage is being pulled to ground when it sho...
The most common cause of B2474 (Passenger Door Lock Switch Circuit Shorted to Ground) is: Damaged, chafed, or pinched wiring in the passenger door harness causing insulation breakdown and direct contact with ground
Typical repair costs for B2474 range from $75 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This code does not affect vehicle safety or drivability and the vehicle is safe to operate. The primary concern is inconvenience due to loss of passenger door lock/unlock function from that switch, though remote keyless entry and other door switches should still operate normally.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2474 to identify the root cause.
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Quick Info
Category
Body
System
Body Control and Security System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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