What Does B1297 Mean?
This code indicates the Body Control Module (BCM) has detected an open circuit in the power supply sensor circuit. The BCM monitors voltage feedback from a sensor that tracks power distribution to body systems, and has detected that the circuit is incomplete or broken. This prevents the BCM from properly monitoring power supply status to various body control functions.
Common Causes
40%
Broken or corroded wiring in the power supply sensor circuit between BCM and sensor connector
30%
Faulty power supply sensor with internal open circuit or failed solder joints
20%
Loose or disconnected electrical connector at power supply sensor or BCM
10%
Failed or corroded BCM internal circuit board trace or power monitoring input
Diagnostic Steps
1
Step 1: Perform visual inspection of all wiring and connectors between the BCM and power supply sensor, checking for obvious damage, corrosion, loose connections, or disconnected plugs. Repair any visible issues found.
2
Step 2: Using a digital multimeter, check for continuity in the power supply sensor signal circuit from the sensor connector to the BCM connector with ignition off and connector(s) disconnected. Reading should show less than 5 ohms resistance; infinite resistance confirms open circuit.
3
Step 3: At the power supply sensor connector (disconnected), measure resistance across sensor terminals per manufacturer specifications (typically 500-5000 ohms depending on sensor type). Out-of-range or infinite reading indicates failed sensor.
4
Step 4: Check BCM power and ground circuits with multimeter - verify battery voltage on power feed and less than 0.5 volts on ground circuits with ignition on. Poor BCM power or ground can cause false open circuit detection.
5
Step 5: If all wiring and sensor test good, perform BCM voltage input test by back-probing the power supply sensor signal wire at BCM connector with ignition on. Should read 5V reference voltage if BCM circuit is functional.
6
Step 6: Clear codes, reconnect all components, cycle ignition, and verify repair by monitoring live data for power supply sensor voltage reading (should show normal operating voltage) and confirm code does not return.
Estimated Repair Cost
$100 - $800
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an open circuit in the power supply sensor circuit. The BCM monitors voltage feedback from a sensor that tracks power distribution to body systems, and has detected that the circuit is incomplete or broken. This prevents the BCM from pro...
The most common cause of B1297 (Power Supply Sensor Circuit Open) is: Broken or corroded wiring in the power supply sensor circuit between BCM and sensor connector
Typical repair costs for B1297 range from $100 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Generally safe to drive short distances, but loss of power monitoring may affect various body control functions like lighting, door locks, or power accessories. Repair should be completed promptly to prevent potential electrical system damage or loss of critical body functions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1297 to identify the root cause.
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Quick Info
Category
Body
System
Body Control System
Difficulty
Type
Manufacturer
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