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 TPS 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 throttle position, leading to poor engine performance, reduced fuel economy, and potential drivability issues. Common causes include a faulty TPS, a short circuit to voltage in the wiring, or a malfunctioning ECM.
1. Most Common Causes
- Faulty throttle position sensor
- Short circuit to battery voltage in TPS signal circuit
- Corroded or damaged TPS connector
- ECM internal failure (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor acceleration or hesitation
- Reduced fuel economy
- Engine stalling or rough idle
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify the code and check freeze frame data.
Step 2: Visually inspect the TPS connector and wiring for damage, corrosion, or shorts.
Step 3: With key on engine off, measure TPS signal voltage at the sensor connector (should be 0.5-4.5V). If voltage is above 4.5V, suspect a short to voltage.
Step 4: Disconnect the TPS and check if voltage drops to 0V. If not, repair short circuit in wiring.
Step 5: If wiring is okay, replace the throttle position sensor.
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, stalling, or reduced power, which may lead to unsafe driving conditions.
How much does it cost to fix?▼
The cost 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.