What Does B1755 Mean?
This code indicates the Body Control Module (BCM) has detected a short to battery voltage in the hazard flasher output circuit. The BCM monitors the hazard light circuit and has identified that voltage is present on the output wire when it should not be, meaning the circuit is receiving unwanted power from the battery. This prevents proper control of the hazard flasher system and may cause hazard lights to operate incorrectly or remain on continuously.
Common Causes
45%
Damaged or chafed wiring harness causing short to power in hazard flasher circuit between BCM and hazard switch or flasher relay
30%
Faulty hazard flasher switch with internal short to power
15%
Failed hazard flasher relay or module with internal short circuit
10%
Body Control Module internal driver circuit failure causing false detection or actual short
Diagnostic Steps
1
Step 1: Perform visual inspection of hazard flasher switch, wiring harness around steering column, and all connectors in the hazard circuit for signs of damage, corrosion, or chafing against metal surfaces
2
Step 2: Disconnect the hazard flasher switch connector and use a digital multimeter to measure voltage on the BCM output wire (hazard control circuit) at the switch connector with ignition on - should read 0V or battery voltage only when hazard is commanded on
3
Step 3: If voltage is present at disconnected switch connector when hazards are off, disconnect BCM connector and check for voltage on the hazard output circuit wire - presence of voltage indicates wiring harness short to power between BCM and switch
4
Step 4: If no voltage found with BCM disconnected, reconnect BCM and measure resistance between hazard output circuit and battery positive - reading below 10k ohms indicates short in wiring or BCM internal failure
5
Step 5: Isolate hazard flasher relay/module by disconnecting it and rechecking circuit - if code clears, relay is faulty; if code persists, trace and repair wiring harness short or replace BCM
6
Step 6: After repairs, clear codes, cycle hazard switch on/off multiple times, and verify proper operation with no code return
Estimated Repair Cost
$100 - $650
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a short to battery voltage in the hazard flasher output circuit. The BCM monitors the hazard light circuit and has identified that voltage is present on the output wire when it should not be, meaning the circuit is receiving unwanted pow...
The most common cause of B1755 (Hazard Flash Output Circuit Short Battery) is: Damaged or chafed wiring harness causing short to power in hazard flasher circuit between BCM and hazard switch or flasher relay
Typical repair costs for B1755 range from $100 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is generally safe to drive, but hazard lights may not function properly which creates a safety risk during roadside emergencies or breakdowns. Repair within a few days to ensure emergency signaling capability is restored.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1755 to identify the root cause.
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Quick Info
Category
Body
System
Body Electrical System - Exterior Lighting
Difficulty
Type
Manufacturer
Recommended Tools
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