What Does P2160 Mean?
The powertrain control module (PCM) has detected an abnormally low voltage signal from Vehicle Speed Sensor B circuit. This sensor provides redundant speed data to ensure accurate vehicle speed readings for transmission, cruise control, and stability systems.
Common Causes
35%
Failed or internally shorted Vehicle Speed Sensor B
30%
Damaged wiring harness or corroded connector pins in sensor circuit
20%
Short to ground in VSS B signal wire
10%
Damaged reluctor ring or tone wheel on transmission/axle
5%
PCM internal fault or poor ground connection
Diagnostic Steps
1
Step 1: Locate Vehicle Speed Sensor B (typically on transmission, transfer case, or rear differential) and inspect connector for corrosion, damage, or moisture intrusion
2
Step 2: Using a digital multimeter, backprobe the sensor connector and verify reference voltage (typically 5V or 12V depending on sensor type) with key on, engine off
3
Step 3: Check signal wire for short to ground by measuring resistance between signal wire and chassis ground with sensor disconnected (should be infinite resistance)
4
Step 4: Monitor live VSS B data with scan tool while rotating wheel or output shaft by hand to verify sensor generates signal
5
Step 5: If sensor and wiring test good, inspect reluctor ring/tone wheel for damage, missing teeth, or excessive air gap between sensor and ring
Estimated Repair Cost
$150 - $450
Parts + labor, varies by vehicle and location
The powertrain control module (PCM) has detected an abnormally low voltage signal from Vehicle Speed Sensor B circuit. This sensor provides redundant speed data to ensure accurate vehicle speed readings for transmission, cruise control, and stability systems.
The most common cause of P2160 (Vehicle Speed Sensor "B" Circuit Low) is: Failed or internally shorted Vehicle Speed Sensor B
Typical repair costs for P2160 range from $150 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may experience erratic speedometer operation, transmission shifting issues, or disabled cruise control. ABS and traction control systems may also be affected, reducing vehicle stability in emergency maneuvers.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2160 to identify the root cause.
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Quick Info
Category
Powertrain
System
Vehicle Speed Sensor System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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