What Does B1416 Mean?
This code indicates the Body Control Module (BCM) has detected an abnormal voltage condition in the left rear power window motor circuit, specifically a short circuit to battery voltage. The BCM monitors current flow and voltage in the window motor circuit and sets this code when it detects voltage present when it should not be, or when commanded voltage is higher than expected. This typically means power is reaching the motor circuit through an unintended path.
Common Causes
40%
Damaged or chafed wiring harness between BCM/door module and window motor, causing wire insulation to contact battery voltage
30%
Failed window motor with internal short circuit to power
20%
Defective window switch or master switch assembly creating unintended power path
10%
Failed door module or BCM with internal circuit fault
Diagnostic Steps
1
Step 1: Perform visual inspection of left rear door wiring harness from BCM/door module to window motor, checking for chafed, pinched, or damaged insulation, especially at door hinge area and rubber boot. Look for signs of water intrusion or corrosion at connectors.
2
Step 2: Disconnect the left rear window motor connector and measure voltage at the motor connector harness side with ignition on and window switch in neutral position using a digital multimeter. Reading should be 0V; any battery voltage present confirms short to power in the harness or control module.
3
Step 3: With motor disconnected, operate window switch and measure voltage at motor connector. If normal operation voltage appears but code remains stored, suspect failed motor with internal short. If abnormal voltage persists with switch off, isolate harness sections between motor, door module, and BCM to locate short.
4
Step 4: If harness tests good, measure resistance between motor terminals (should be 3-8 ohms typically) and from each terminal to motor case/ground (should be infinite resistance). Low resistance to ground or case indicates failed motor.
5
Step 5: Clear code, reconnect all components, and cycle window operation through full range. Monitor live data for current draw (typically 3-8 amps under load) and verify code does not return. Excessive current or immediate code return indicates repair was unsuccessful.
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an abnormal voltage condition in the left rear power window motor circuit, specifically a short circuit to battery voltage. The BCM monitors current flow and voltage in the window motor circuit and sets this code when it detects voltage ...
The most common cause of B1416 (Power Window LR Motor Circuit Short To Battery) is: Damaged or chafed wiring harness between BCM/door module and window motor, causing wire insulation to contact battery voltage
Typical repair costs for B1416 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This is safe to drive as it only affects passenger comfort (power window operation). The left rear window may be inoperative or stuck in one position. Repair is not urgent but should be addressed to restore window function and prevent potential BCM damage from continued short circuit conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1416 to identify the root cause.
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Quick Info
Category
Body
System
Body Electrical System - Power Window Circuit
Difficulty
Type
Manufacturer
Recommended Tools
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