P2161
Vehicle Speed Sensor B Circuit Intermittent/Erratic/High
VSS B signal jumps, drops out, or reads above plausibility — connector or harness issue, or magnetic ring damaged.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Intermittent connectorCommon
- Tone ring chippedPossible
- Connector with intermittent contact under vibrationLess likely
Parts involved
- Vehicle Speed Sensor B
- Speed Sensor Tone Ring
P2161 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.