Throttle Position Sensor Output Circuit Open
The P2620 code indicates an open circuit in the throttle position sensor (TPS) output circuit. The TPS is a potentiometer that sends a voltage signal to the engine control module (ECM) indicating throttle plate angle. An open circuit means there is a break in the wiring or a failed sensor, causing the ECM to receive no or erratic signal. This can lead to poor engine performance, reduced power, and potential stalling.
01. Most Common Causes
- Open or broken wire in TPS signal circuit
- Corroded or damaged TPS connector
- Failed throttle position sensor
- Faulty ECM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor acceleration or hesitation
- Engine stalling or rough idle
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify code P2620 and check for other related codes.
Step 2: Visually inspect the TPS wiring and connector for damage, corrosion, or loose pins.
Step 3: With key on engine off, measure voltage at TPS signal wire (typically 0.5-1.0V at closed throttle, 4.5V at wide open). If no voltage, check for open circuit.
Step 4: If wiring is intact, test TPS resistance across its terminals; replace if out of spec.
Step 5: Clear code and test drive; if code returns, check ECM for faults.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The vehicle may experience reduced power, stalling, or unresponsive throttle, which can be dangerous in traffic.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on whether it's a wiring repair or sensor replacement.