Code P2162 indicates the control module has detected an irrational relationship between the signals from Vehicle Speed Sensor A and Vehicle Speed Sensor B. This discrepancy suggests one sensor is providing inaccurate data compared to the other while the vehicle is in motion. The system compares these inputs to verify vehicle speed for transmission shifting and engine management.
Harness chafing, corrosion, or loose pins in the sensor circuit are the most frequent cause of signal correlation errors.
Internal failure within Vehicle Speed Sensor A or B can cause intermittent signal loss or incorrect frequency output.
Physical damage to the reluctor wheel or tone ring prevents the sensor from reading speed accurately.
High resistance in the sensor ground circuit can cause voltage drops that skew the signal data.
Metallic debris or transmission fluid buildup on a magnetic sensor can interfere with signal generation.
Internal PCM processor failure is rare and should only be considered after all external circuits and sensors are verified.
No, PCM failure is rare for this code; wiring or sensor faults are the primary cause and should be ruled out first.
Caution is advised as speedometer errors and shifting issues can affect safety and transmission health.
Yes, an active Check Engine Light typically results in an automatic emissions test failure.
Often yes, as the PCM frequently compares transmission speed data with wheel speed data from the ABS system.