Throttle Position Sensor Circuit High Voltage
The P2622 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the throttle position sensor (TPS) that is higher than the expected range. This typically occurs when the sensor's output voltage exceeds the normal operating range (usually above 4.5 volts). The TPS is a potentiometer that tells the ECM the position of the throttle plate. A high voltage reading can cause the ECM to misinterpret the throttle position, leading to poor engine performance, reduced fuel economy, and potential drivability issues.
01. Most Common Causes
- Faulty throttle position sensor
- Short to voltage in the TPS signal circuit
- Damaged wiring or connector at the TPS
- Corroded or loose electrical connections
- Faulty ECM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor acceleration or hesitation
- Engine stalling or rough idle
- Reduced fuel economy
- Inability to rev past a certain RPM
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for any additional codes.
Step 2: Visually inspect the TPS wiring and connector for damage, corrosion, or loose pins.
Step 3: With the ignition on, measure the TPS signal voltage at the sensor connector. It should be around 0.5-1.0V at closed throttle and 4.5-5.0V at wide open throttle.
Step 4: If voltage is high (e.g., 5V) at closed throttle, check for a short to 5V reference or battery voltage in the signal wire.
Step 5: Test the TPS by disconnecting it and checking resistance across the terminals; replace if out of specification.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code, as it can cause unpredictable throttle response, stalling, or reduced power, which may be dangerous in traffic.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150, including parts and labor. A new TPS sensor costs around $20-$60, and labor is about $30-$90.