Vehicle Speed Sensor "B"
The Vehicle Speed Sensor (VSS) B circuit is malfunctioning or not communicating properly with the PCM. This sensor provides critical speed data for transmission shifting, ABS operation, and speedometer function. The code sets when the PCM detects an electrical problem or signal issue with the secondary speed sensor.
What You Might Notice
- Speedometer and odometer not working or reading incorrectly
- Antilock brake system (ABS) malfunction or reduced effectiveness
- Brake or ABS warning light illuminated on dashboard
- Erratic or delayed automatic transmission shifting
- Engine RPM limiter may reduce maximum engine speed
Most Common Causes
- 1
Faulty Vehicle Speed Sensor B
The VSS B sensor itself may be defective or failing, unable to generate proper signal output to the PCM. This is the most common cause of this code.
- 2
Damaged wiring or connectors
Broken, frayed, corroded, or loose wiring and connectors in the VSS B circuit prevent proper signal transmission. Check for damage along the sensor harness.
- 3
Incorrect tire size configuration
The PCM may be programmed for a different tire size than what is currently installed on the vehicle, causing incorrect speed calculations. This often occurs after tire changes.
- 4
PCM configuration or software issue
The powertrain control module may have incorrect programming, outdated software, or internal communication faults that prevent proper VSS B signal processing.
How to Diagnose It
- 1
Check Faulty Vehicle Speed Sensor B — The VSS B sensor itself may be defective or failing, unable to generate proper signal output to the PCM. This is the most common cause of this code.
- 2
Check Damaged wiring or connectors — Broken, frayed, corroded, or loose wiring and connectors in the VSS B circuit prevent proper signal transmission. Check for damage along the sensor harness.
- 3
Check Incorrect tire size configuration — The PCM may be programmed for a different tire size than what is currently installed on the vehicle, causing incorrect speed calculations. This often occurs after tire changes.
- 4
Check PCM configuration or software issue — The powertrain control module may have incorrect programming, outdated software, or internal communication faults that prevent proper VSS B signal processing.
How to Fix It
- 1
Replace Vehicle Speed Sensor B
Locate the VSS B sensor (typically at the transmission output or wheel area), disconnect the harness, remove the mounting fastener, and install a new OEM or quality aftermarket sensor. Clear the code after installation.
- 2
Repair wiring and connectors
Inspect the entire VSS B circuit harness for breaks, corrosion, and loose connections. Repair or replace damaged wiring, clean corroded connectors, and ensure all connections are secure.
- 3
Verify and correct tire size configuration
Confirm the tire size currently on the vehicle matches the PCM programming. If tires were recently changed, reprogram the PCM with the correct tire size specification through the vehicle's diagnostic interface or dealer software.
- 4
Reprogram or replace PCM
If wiring and sensor checks pass, the PCM may require software update or reprogramming. In rare cases, the module itself may be defective and require replacement. Consult a dealer for PCM programming.
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