Throttle Position Sensor Circuit Range/Performance
The P212B code indicates that the Engine Control Module (ECM) has detected a signal from the throttle position sensor (TPS) that is outside the expected range or not performing correctly. This sensor monitors the angle of the throttle plate and sends voltage signals to the ECM to adjust fuel delivery and ignition timing. A fault in the circuit or sensor can cause incorrect air-fuel mixture, leading to drivability issues.
1. Most Common Causes
- Faulty throttle position sensor
- Wiring or connector issues in the TPS circuit
- Corrosion or loose connections
- Carbon buildup on throttle body affecting sensor operation
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor acceleration or hesitation
- Rough idle or stalling
- Reduced fuel economy
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect TPS wiring and connectors for damage or corrosion.
Step 3: Test TPS voltage signal with a multimeter while manually opening throttle.
Step 4: Compare readings to manufacturer specifications; replace sensor if out of range.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause poor performance and potential stalling, which may be unsafe.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on vehicle make and model.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.