Throttle Position Sensor Circuit Low
The P212C code indicates that the Engine Control Module (ECM) has detected a low voltage signal from the throttle position sensor (TPS) circuit. This sensor is critical for determining the driver's throttle input and adjusting fuel delivery accordingly. A low voltage condition can result from a faulty sensor, wiring issues, or a malfunctioning throttle body. This can lead to poor engine performance, reduced fuel economy, and potential stalling.
01. Most Common Causes
- Faulty throttle position sensor
- Open or shorted wiring in the TPS circuit
- Corroded or loose connector at the TPS
- Malfunctioning throttle body
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or hesitation
- Poor acceleration or surging
- Engine stalling or rough idle
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Visually inspect the TPS connector and wiring for damage, corrosion, or loose connections.
Step 3: Test the TPS voltage signal with a multimeter; compare to manufacturer specifications.
Step 4: If voltage is low, check the reference voltage (typically 5V) and ground circuits.
Step 5: Replace the throttle position sensor if it fails the voltage test and wiring is intact.
04. Commonly Affected Makes
05. 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 and stalling, which may lead to an accident.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the vehicle and shop rates.