P0638 on VOLKSWAGEN JETTA — Throttle Actuator Control Range/Performance Bank 1

Q: "What does P0638 mean on a VOLKSWAGEN JETTA?"

"P0638 indicates: Throttle Actuator Control Range/Performance Bank 1. This is a computer and output circuits code. 2 VOLKSWAGEN JETTA owners have reported this to NHTSA."

Q: "What are the most common causes of P0638 on VOLKSWAGEN JETTA?"

"Based on 2 NHTSA reports, the most commonly cited components are: Engine, Engine,Fuel/Propulsion System. These percentages are based on the component field in owner complaints."

Q: "Is P0638 serious on my VOLKSWAGEN JETTA?"

"Of 2 NHTSA reports for this code on VOLKSWAGEN JETTA, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my VOLKSWAGEN JETTA shows P0638?"

"1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare."

What P0638 Means on Your VOLKSWAGEN JETTA

P0638 is a diagnostic trouble code indicating: Throttle Actuator Control Range/Performance Bank 1. This code relates to the computer and output circuits system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

2 VOLKSWAGEN JETTA owners have reported this issue to NHTSA across model years 2009-2010. Most reports come from the 2009, 2010 model years. The most commonly reported component is Engine (50.0% of reports).

Real VOLKSWAGEN JETTA Owner Reports

Source: NHTSA Complaints Database

"My 2009 jetta sportwagen tdi has experienced a disturbing no-start condition several times. cranking the engine did not result in a start. only after repeated cranking (5-10 times) did the car actually start."

— 2009 VOLKSWAGEN JETTA owner · ENGINE · Filed 12/20/2012

"Dealership performed 90k mile checkup. also asked them to determine if cel p0472 was covered by warranty. they confirmed code, and said not covered under any warranty. the also advised the car is showing intermittent code of p0638 for throttle actuator control (bank 1)."

— 2010 VOLKSWAGEN JETTA owner · ENGINE,FUEL/PROPULSION SYSTEM · Filed 01/07/2016

All reports filed by vehicle owners directly with the U.S. Department of Transportation.

📊 Complaint Trend by Model Year

1

'09

1

'10

Common Causes on VOLKSWAGEN JETTA

Based on NHTSA complaint component analysis for this vehicle.

ENGINE 50%

ENGINE,FUEL/PROPULSION SYSTEM 50%

What To Do Next

1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.

Frequently Asked Questions

What does P0638 mean on a VOLKSWAGEN JETTA? ▾

P0638 indicates: Throttle Actuator Control Range/Performance Bank 1. This is a computer and output circuits code. 2 VOLKSWAGEN JETTA owners have reported this to NHTSA.

What are the most common causes of P0638 on VOLKSWAGEN JETTA? ▾

Based on 2 NHTSA reports, the most commonly cited components are: Engine, Engine,Fuel/Propulsion System. These percentages are based on the component field in owner complaints.

Is P0638 serious on my VOLKSWAGEN JETTA? ▾

Of 2 NHTSA reports for this code on VOLKSWAGEN JETTA, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my VOLKSWAGEN JETTA shows P0638? ▾

1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare.

P0638 on Other Vehicles

KIA SORENTO

3 reports

→ All codes reported on VOLKSWAGEN JETTA