Throttle Position Sensor Circuit High
The P212D code indicates that the throttle position sensor (TPS) or switch circuit is reading a higher voltage than expected. This sensor monitors the throttle plate angle and sends a signal to the engine control module (ECM). A high voltage reading can be caused by a faulty sensor, wiring issues, or a problem with the ECM. This can lead to poor engine performance, reduced fuel economy, and potential stalling.
1. Most Common Causes
- Faulty throttle position sensor
- Short to voltage in the sensor circuit
- Damaged wiring or connector
- Corroded terminals
- Faulty ECM (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor acceleration or hesitation
- Reduced engine power
- Rough idle or stalling
- Increased fuel consumption
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for other related codes.
Step 2: Visually inspect the throttle position sensor wiring and connector for damage, corrosion, or loose connections.
Step 3: Test the sensor voltage with a multimeter; compare to manufacturer specifications.
Step 4: If voltage is high, check for a short to power in the signal wire.
Step 5: Replace the throttle position sensor if it fails testing.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause unpredictable throttle response, reduced power, and stalling, which may lead to unsafe driving conditions.
How much does it cost to fix?▼
The cost to fix P212D typically ranges from $50 to $150 for parts and labor, depending on the vehicle and whether the sensor or wiring needs replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.