What Does B1383 Mean?
This code indicates the Body Control Module (BCM) has detected an abnormal voltage condition in the oil level warning lamp circuit, specifically a short to battery voltage (12V+). The BCM monitors the oil level indicator lamp circuit and has detected current flow when the circuit should be off, or voltage present above normal operating parameters. This electrical fault prevents proper operation of the oil level warning system.
Common Causes
40%
Damaged wiring harness with insulation worn through, causing direct contact with battery voltage source
30%
Failed Body Control Module with internal short circuit in lamp driver output stage
20%
Faulty instrument cluster with internal short in oil level lamp circuit or bulb socket
10%
Corroded or damaged connector terminals causing cross-circuit contamination or moisture intrusion
Diagnostic Steps
1
Step 1: Perform visual inspection of instrument cluster and BCM connectors for signs of corrosion, pin damage, or moisture. Check for any aftermarket installations or recent repairs that may have damaged wiring near the dashboard area.
2
Step 2: Disconnect the instrument cluster connector and use a digital multimeter to measure voltage on the oil level lamp circuit wire at the harness side (BCM side). Key on, engine off - reading should be 0V or switching voltage. Constant 12V+ indicates short to power in the harness between BCM and cluster.
3
Step 3: If voltage is present at cluster connector with cluster disconnected, disconnect BCM connector and check for continuity between the oil level lamp circuit wire and known battery voltage sources. Inspect harness routing for pinch points, especially near metal brackets, steering column, or where harness passes through firewall.
4
Step 4: If no short found in harness, reconnect BCM and measure voltage at BCM connector oil level lamp output pin while monitoring for 12V constant. Compare to service manual specifications for proper lamp driver output behavior. If BCM output shows internal fault, BCM replacement required.
5
Step 5: If harness and BCM test normal, inspect instrument cluster internally for solder joint failures, burned traces, or lamp socket shorts. Test cluster on bench if possible or substitute known-good cluster to confirm.
6
Step 6: After repair, clear codes, cycle ignition multiple times, and verify oil level lamp operates normally during bulb check and that code does not return. Road test and monitor for code recurrence.
Estimated Repair Cost
$100 - $800
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an abnormal voltage condition in the oil level warning lamp circuit, specifically a short to battery voltage (12V+). The BCM monitors the oil level indicator lamp circuit and has detected current flow when the circuit should be off, or v...
The most common cause of B1383 (Oil Level Lamp Circuit Short To Battery) is: Damaged wiring harness with insulation worn through, causing direct contact with battery voltage source
Typical repair costs for B1383 range from $100 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but the oil level warning lamp will not function properly, preventing notification of actual low oil conditions which could lead to engine damage if oil level drops unnoticed. Verify oil level manually until repaired and monitor for other warning lamps.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1383 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
Instrument Panel / Warning Lamp System
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
