1. What is P0638?

The P0638 OBD-II trouble code means a problem in the Throttle Actuator Control Range/Performance. It occurs when the ECU detects abnormal throttle response or actuator position.

2. Common Causes of P0638

• Faulty throttle actuator motor (Ford F-150 EcoBoost)
• Corroded connectors (Volkswagen Tiguan throttle actuator)
• Broken wiring harness between ECM and throttle body
• ECU software miscalibration
• Carbon buildup inside throttle body

3. Symptoms

• Check Engine Light with P0638 code
• Reduced throttle response
• Rough idle and hesitation
• Engine entering limp mode
• Higher fuel consumption

4. Models Affected

• Ford: F-150 EcoBoost, Explorer
• Chevrolet: Malibu, Equinox
• Volkswagen: Tiguan, Jetta

5. Diagnostic Steps with ICARZONE UR800

• Scan vehicle with ICARZONE UR800 for P0638 and related codes
• Check live throttle actuator data (position, voltage, current)
• Inspect connectors and wiring for corrosion
• Clean throttle body and reset ECU
• Perform ECM software update if necessary

6. Fixes for P0638

• Replace faulty throttle actuator motor
• Repair/replace wiring harness
• Clean throttle body and connectors
• Update ECU software

7. Repair Costs & Safety Tips

• Throttle actuator motor replacement: $200–$450
• Wiring harness repair: $80–$150
• ECU reprogramming: $50–$100
• Tip: Always disconnect the battery before servicing

8. Prevention

• Inspect throttle body every 20,000 miles
• Use ICARZONE UR800 scanner to check live data regularly
• Keep connectors clean and corrosion-free
• Update ECU software when available

9. FAQ

Can I drive with P0638? Yes, but performance will be reduced; repair promptly.

Does cleaning throttle body fix it? Sometimes, but actuator replacement may be required.

Is ICARZONE UR800 useful? Yes, it provides live data and accurate diagnostics for throttle actuator issues.

10. Summary

P0638 indicates a Throttle Actuator Control Range/Performance issue. It affects Ford F-150, Chevrolet Malibu, Volkswagen Tiguan and others. Using the ICARZONE UR800 scanner, you can quickly identify causes, fix wiring or actuator faults, and restore performance.