P0222: Throttle/Pedal Position Sensor/Switch B Circuit Low Input
Can you still drive? Drive with extreme caution only if necessary. Limp mode limits speed and power. Have the vehicle towed if throttle response is severely impaired.
What Does P0222 Mean?
Code P0222 indicates that the secondary throttle position sensor (TPS B) is reporting a voltage below the expected minimum threshold. This typically points to a short to ground, a broken sensor, or a wiring problem. The ECM relies on dual TPS signals for safe throttle control, and a low-voltage fault on TPS B will trigger limp mode.
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Browse OBD-II Scanners on AmazonCommon Causes
- Short to ground in TPS B signal wire
- Failed throttle position sensor B
- Corroded or disconnected TPS connector
- Damaged wiring harness at throttle body
- Faulty electronic throttle body
Symptoms
- Check engine light on
- Engine enters limp mode
- Vehicle will not accelerate normally
- Idle may be higher or lower than normal
- Intermittent stalling
Diagnostic Steps
- 1Read TPS B voltage with scan tool (should increase smoothly from about 0.5V to 4.5V)
- 2Check for short to ground on TPS B signal wire
- 3Inspect throttle body connector for corrosion or water intrusion
- 4Verify 5V reference voltage at the TPS connector
- 5Compare TPS A and TPS B voltage curves during throttle sweep
- 6Replace throttle body or TPS if sensor output is stuck low
Recommended Parts & Tools
throttle body assembly
throttle body cleaner
electrical contact cleaner
wiring repair kit
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $100 - $700 |
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Frequently Asked Questions
What does 'low input' mean on P0222?
Low input means the TPS B sensor voltage is below the minimum expected value. This usually indicates a wiring short to ground or a failed sensor rather than a mechanical throttle issue.
Can water cause P0222?
Yes, water intrusion into the throttle body connector is a known cause, especially after driving through deep puddles or after engine washing. Dry the connector and apply dielectric grease.
Community Fix Reports
Community reports are user-submitted and not verified by Auto AI Buddy. Results may vary.
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