What Does B2152 Mean?
This code indicates the Body Control Module (BCM) has detected that the rear seat vertical adjustment motor position is outside its expected operational range. The BCM monitors the motor's position feedback sensor and sets this code when the actual position does not match the commanded position or exceeds calibrated limits. This typically occurs in vehicles equipped with power-adjustable rear seats with height adjustment capability.
Common Causes
35%
Failed or binding seat vertical motor mechanism due to physical obstruction, debris, or internal motor failure
30%
Faulty position sensor or potentiometer providing incorrect feedback to BCM
20%
Damaged wiring harness, corroded connectors, or poor ground connection between motor and BCM
10%
Mechanical binding or seized seat track/lift mechanism preventing normal motor operation
5%
BCM internal fault or corrupted seat position calibration data
Diagnostic Steps
1
Step 1: Perform visual inspection of rear seat vertical motor assembly and wiring harness for physical damage, disconnected connectors, corrosion, or visible obstructions preventing normal seat travel. Manually test seat movement range for binding or resistance.
2
Step 2: Using a digital multimeter, test motor power and ground circuits at the motor connector with ignition on and seat switch activated. Verify battery voltage (12-14V) on power feed and less than 0.5V on ground circuit. Check for voltage drop across connectors.
3
Step 3: Access live data on scan tool to monitor seat position sensor voltage/values while manually moving seat through full vertical range. Compare actual readings to expected range (typically 0.5-4.5V). Erratic or out-of-range values indicate sensor failure.
4
Step 4: If electrical circuits test normal, disconnect motor and apply direct 12V power to motor terminals to verify motor operation independent of vehicle systems. Motor should run smoothly without binding. Reverse polarity to test both directions.
5
Step 5: Inspect seat track mechanism and mounting points for mechanical binding, broken components, or foreign objects. Lubricate tracks with appropriate lubricant if dry or corroded. Check all mounting bolts for tightness.
6
Step 6: After repairs, perform BCM seat position relearn/calibration procedure using scan tool (if available) or manual method per manufacturer specifications. Clear codes and cycle seat through full range to verify proper operation and confirm code does not return.
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected that the rear seat vertical adjustment motor position is outside its expected operational range. The BCM monitors the motor's position feedback sensor and sets this code when the actual position does not match the commanded position or e...
The most common cause of B2152 (Seat Rear Vertical Motor Position Out of Range) is: Failed or binding seat vertical motor mechanism due to physical obstruction, debris, or internal motor failure
Typical repair costs for B2152 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this does not affect vehicle operation or primary safety systems. This is a comfort feature failure that should be repaired when convenient to restore full seat adjustment functionality.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2152 to identify the root cause.
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Quick Info
Category
Body
System
Body Comfort and Convenience Systems
Difficulty
Type
Generic (SAE)
Recommended Tools
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