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 position of the accelerator pedal and sends a signal to the engine control module (ECM). A high voltage reading suggests a short to power, a faulty sensor, or wiring issues. This can cause incorrect air-fuel mixture, leading to poor engine performance.
01. Most Common Causes
- Faulty throttle position sensor
- Short to voltage in sensor circuit
- Damaged wiring or connector
- Corroded terminals
- ECM failure (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor acceleration or hesitation
- Rough idle or stalling
- Increased fuel consumption
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect TPS wiring and connector for damage or corrosion.
Step 3: Test TPS voltage reference (5V) and ground at the connector.
Step 4: Measure signal voltage while slowly pressing accelerator pedal; should vary smoothly from ~0.5V to ~4.5V.
Step 5: If voltage is stuck high or erratic, replace TPS and clear codes.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The vehicle may enter limp mode, limiting speed and acceleration, which can be dangerous in traffic.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on vehicle make and model.