Diagnostic Trouble Code
P0220 — Throttle Position Sensor B — Circuit Malfunction
Throttle Position Sensor B — Circuit Malfunction
Definition
The ECM has detected a fault in the secondary throttle position sensor (TPS B), which provides a redundant signal to verify the primary TPS A reading. Modern electronic throttle systems require both sensors to agree for safe operation.
Common Causes
- Failed electronic throttle body with integrated dual TPS
- Wiring damage in the TPS B signal circuit
- Connector corrosion or intermittent contact
- ECM driver circuit failure (rare)