What Does B2153 Mean?
B2153 indicates the Body Control Module (BCM) has detected a malfunction in the rear parking assist ultrasonic sensor circuit. This code is part of the parking assist or collision avoidance system that uses ultrasonic sensors mounted in the rear bumper to detect obstacles. The BCM has identified an open circuit, short circuit, or signal failure from one of the rear echo/ultrasonic sensors preventing proper distance measurement.
Common Causes
45%
Damaged or corroded rear parking sensor or sensor connector due to water intrusion, road debris impact, or corrosion
30%
Broken, chafed, or shorted wiring harness between the rear sensor and BCM
15%
Faulty Body Control Module (BCM) unable to process sensor signals correctly
10%
Poor ground connection at sensor mounting point or harness ground
Diagnostic Steps
1
Step 1: Perform visual inspection of all rear bumper-mounted ultrasonic sensors for physical damage, cracks, water intrusion, or paint/debris blockage. Check sensor mounting integrity and inspect connectors for corrosion, pushed-back pins, or moisture.
2
Step 2: Using a digital multimeter, backprobe the suspected rear sensor connector and measure resistance across sensor terminals (typical reading 50-200 ohms depending on manufacturer). Compare readings to known-good sensors on the same vehicle.
3
Step 3: Check voltage supply and ground at sensor connector with ignition on (typically 5V or 12V reference depending on system design). Verify signal wire continuity from sensor connector back to BCM connector using wiring diagram and multimeter resistance test.
4
Step 4: If wiring and power/ground are intact, swap suspected faulty sensor with a known-good sensor from opposite side of vehicle and clear codes. Test parking assist system operation to confirm if fault follows the sensor (sensor failure) or stays with circuit (wiring/BCM issue).
5
Step 5: Repair or replace identified faulty component (sensor, wiring, or connector). Clear codes, perform parking assist system calibration if required by manufacturer, and verify proper operation with road test backing toward obstacles at various distances.
Estimated Repair Cost
$100 - $450
Parts + labor, varies by vehicle and location
B2153 indicates the Body Control Module (BCM) has detected a malfunction in the rear parking assist ultrasonic sensor circuit. This code is part of the parking assist or collision avoidance system that uses ultrasonic sensors mounted in the rear bumper to detect obstacles. The BCM has identified an ...
The most common cause of B2153 (Rear Echo Sensor Circuit Failure) is: Damaged or corroded rear parking sensor or sensor connector due to water intrusion, road debris impact, or corrosion
Typical repair costs for B2153 range from $100 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this only affects parking assistance functionality. The parking assist system will be disabled or provide inaccurate warnings, requiring extra caution when reversing, but vehicle operation is not impaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2153 to identify the root cause.
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Quick Info
Category
Body
System
Parking Assist / Driver Assistance System
Difficulty
Type
Generic (SAE)
Recommended Tools
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