What Does B1364 Mean?
B1364 indicates the Body Control Module (BCM) has detected an open circuit in the ignition start circuit, which controls the starter motor engagement when the ignition key or start button is activated. This code means the BCM is not receiving proper feedback or cannot complete the circuit path necessary to crank the engine. The open circuit prevents electrical current from flowing through the starter control system, potentially resulting in a no-start condition.
Safety Warning
Vehicle may not start or may experience intermittent starting issues, leaving you stranded. While not immediately dangerous if vehicle is already running, this is a critical repair needed to ensure reliable vehicle operation and should be addressed immediately.
Common Causes
35%
Faulty ignition switch or start button assembly with internal open circuit or worn contacts
30%
Broken, corroded, or loose wiring/connectors in the starter control circuit between BCM and ignition switch
20%
Failed starter relay or starter solenoid with open coil preventing circuit completion
15%
Faulty Body Control Module (BCM) with internal circuit failure in starter control output
Diagnostic Steps
1
Step 1: Perform visual inspection of ignition switch/start button wiring harness and connectors for obvious damage, corrosion, or loose connections. Check for pushed-back pins in connectors and repair as needed.
2
Step 2: Using a multimeter, check for continuity and proper voltage at the ignition switch connector. With key in START position, verify switch closes circuit properly (continuity present) and releases when key returns to RUN position.
3
Step 3: Test the starter relay by removing it and performing bench test with multimeter for coil resistance (typically 50-120 ohms) and contact continuity when energized. Swap with known-good relay of same type if available.
4
Step 4: Backprobe the BCM connector at the starter control output circuit with a multimeter while monitoring voltage during start attempt. Verify BCM is sending proper signal (typically 12V) when start is commanded.
5
Step 5: Check wiring continuity between BCM and ignition switch, and between BCM and starter relay using wiring diagram. Look for resistance readings above 5 ohms indicating damaged wiring.
6
Step 6: After repair, clear codes and perform start function test multiple times to verify proper circuit operation and confirm no code returns.
Estimated Repair Cost
$100 - $650
Parts + labor, varies by vehicle and location
B1364 indicates the Body Control Module (BCM) has detected an open circuit in the ignition start circuit, which controls the starter motor engagement when the ignition key or start button is activated. This code means the BCM is not receiving proper feedback or cannot complete the circuit path neces...
The most common cause of B1364 (Ignition Start Circuit Open) is: Faulty ignition switch or start button assembly with internal open circuit or worn contacts
Typical repair costs for B1364 range from $100 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may not start or may experience intermittent starting issues, leaving you stranded. While not immediately dangerous if vehicle is already running, this is a critical repair needed to ensure reliable vehicle operation and should be addressed immediately.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1364 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Body
System
Starting System / Body Control
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
