Rear Parking Sensor Circuit Failure
The B2153 code indicates that the Parking Assist Module (PAM) or Body Control Module (BCM) has detected a fault in the rear ultrasonic sensor circuit, often called the echo sensor. This means the signal is out of range, or there is an open circuit, short to ground, or short to battery in the wiring or the sensor itself, preventing accurate rear distance measurement.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty rear ultrasonic sensor (internal failure or damaged housing)
- Open or short circuit in the sensor's signal, power, or ground wiring
- Corroded, loose, or damaged connector terminals at the sensor
- Internal failure of the Parking Assist Module (PAM) or BCM
- Physical obstruction or mechanical damage to the sensor face (e.g., impact, excessive paint)
3. Symptoms You Will Notice
- Parking assist system inoperative or intermittent
- False or no obstacle detection when reversing
- Audible warning tone continuously on or off
- Parking assist warning light on the dashboard
4. Step-by-Step Diagnosis
Scan the system for codes and verify B2153 is present
Visually inspect the rear ultrasonic sensors for physical damage, dirt, or paint overspray
Check the wiring and connectors for corrosion, damage, or loose connections
Test sensor power, ground, and signal circuits with a multimeter
If wiring is okay, substitute a known-good sensor to see if the fault clears
If the fault persists, test the PAM/BCM for internal failure
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive, but the parking assist system will not function, so you must rely on mirrors and caution when reversing.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, depending on whether the sensor ($50-$150) or the module ($200-$400) needs replacement, plus labor.