P2622 — Throttle Position Output Circuit High #

Note: The code label for P2622 may vary depending on the vehicle manufacturer. Always refer to your vehicle’s service manual for the specific description used by your OEM (Original Equipment Manufacturer).

• Throttle Position Output Circuit High (Generic/SAE)
• Throttle Position Sensor Output High Voltage (Ford)
• Accelerator Pedal Position Output Circuit High (Toyota)
• TP Sensor Output Circuit High (GM, Chrysler)

Summary of DTC P2622 #

P2622 is a Diagnostic Trouble Code (DTC) that indicates the engine control module (ECM) has detected an unusually high voltage in the throttle position sensor (TPS) output circuit. The TPS is a critical component that monitors the position of the throttle plate and sends this information to the ECM, which uses the input to adjust engine performance. When the voltage signal from this sensor remains higher than the expected range, the ECM sets the P2622 code and may store it as either a pending or confirmed fault. This code is commonly associated with drivability issues, including erratic idling and poor throttle response. It’s important to address this code promptly to avoid potential safety risks and further engine complications.

Common Symptoms for DTC P2622 #

When the P2622 code is triggered, drivers may notice several symptoms that impact the drivability and performance of the vehicle. These symptoms can vary based on the vehicle make, model, and how the ECM reacts to the detected fault. If you’re experiencing any of the following, a scan for P2622 is recommended:

• Check Engine Light illuminated or flashing
• Unstable or high engine idle
• Poor throttle response or hesitation
• Increased fuel consumption
• Possible limp mode activation (reduced power)
• Engine stalling, especially at idle or low speeds

Most Likely Causes of DTC P2622 #

The P2622 code typically stems from problems within the throttle position sensor circuit, but other related issues may also trigger it. Here are the most common causes, listed in order of frequency:

1. Faulty Throttle Position Sensor (TPS): Internal sensor failure or worn contacts.
2. Wiring Issues: Short to voltage, corroded, broken, or loose wires/connectors in the TPS circuit.
3. Malfunctioning ECM: Rare, but possible if the ECM cannot properly interpret the sensor signal.
4. Aftermarket Modifications: Unapproved throttle body replacements or wiring changes.
5. Sensor Circuit Contamination: Water ingress, oil, or debris affecting the connector or sensor.

Step-by-Step Diagnostic for P2622 #

Diagnosing P2622 requires a systematic approach to isolate the root cause. Even seasoned technicians follow a logical sequence to avoid parts swapping and wasted time. Here’s how you can proceed:

• 1. Scan for Additional Codes: Check for related DTCs (e.g., P0120-P0124, P2135) that may offer clues.
• 2. Visual Inspection: Inspect the TPS and harness for visible signs of damage, corrosion, or loose connections.
• 3. Check TPS Voltage: With a digital voltmeter, monitor the TPS signal wire. Key on, engine off; voltage should typically range from ~0.5V (closed throttle) to ~4.5V (wide open). A reading stuck high (>4.5V) confirms the issue.
• 4. Wiring Continuity Test: Check the TPS circuit for short to power or ground using a wiring diagram.
• 5. Substitute with Known Good Sensor (if possible): Swap the TPS to rule out sensor failure.
• 6. ECM Testing: If all else checks out, consult OEM procedures for ECM testing or reprogramming.

Possible Repairs for P2622 #

Once the source of the high voltage condition is identified, appropriate repairs can be made. Always clear the code and test drive the vehicle to confirm the fix. Depending on the root cause, the following repairs are common:

• Replace a faulty throttle position sensor (TPS)
• Repair or replace damaged wiring/connectors in the TPS circuit
• Clean contaminated connectors and apply dielectric grease
• Secure all loose harnesses and connectors
• Reflash or replace the ECM (only if verified as faulty)
• Reverse unapproved aftermarket modifications

Can You Drive With Code P2622? #

Driving with P2622 is not recommended except in emergencies. While the vehicle may still run, the high voltage from the TPS can cause unpredictable throttle behavior, surging, or limp mode activation. This poses a safety risk, especially in traffic or at highway speeds. Address the code as soon as possible to avoid engine stalling or loss of power.

Vehicles Most Commonly Affected by P2622 #

P2622 is a generic OBD-II code, so it can appear on a wide range of vehicles, especially those with drive-by-wire throttle systems. However, it’s more frequently reported on certain makes due to sensor placement and wiring design:

• Ford (Focus, Fusion, Escape, F-150)
• General Motors (Chevrolet Silverado, Malibu, GMC Sierra)
• Toyota (Camry, Corolla, Tacoma)
• Honda (Civic, Accord, CR-V)
• Chrysler (Dodge Ram, Jeep Grand Cherokee)

Common Mistakes & Best Practices for P2622 #

Diagnosing P2622 can trip up even experienced DIYers. Avoid these frequent errors and follow these best practices for an efficient repair:

• Replacing the TPS without confirming voltage or wiring faults first
• Overlooking corroded or loose connectors at the sensor or ECM
• Ignoring related DTCs that may help pinpoint the cause
• Forgetting to clear codes and perform a test drive after repairs
• Skipping the use of a high-quality digital voltmeter for accurate readings

Express FAQ — P2622 #

Here are quick answers to the most common questions about P2622:

• Q: Will replacing the TPS always fix P2622?
  A: Not always. While a failed TPS is common, wiring faults or connector issues can produce the same symptom. Always diagnose thoroughly.
• Q: Can I reset the code and ignore it if my car drives fine?
  A: Clearing the code without fixing the root cause may result in unsafe driving conditions or the code returning. Always address the issue.