Error code

OBD2 P0639

OBD2P0639
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Throttle Actuator Control Range/Performance.

Severity

moderateCan drive, but may experience poor acceleration and hesitation.

Summary

P0639 indicates a throttle actuator control issue on bank 2, related to range or performance problems. This can affect how the engine responds during acceleration.

Symptoms

  • Stored trouble code
  • Illuminated warning light
  • Poor acceleration or hesitation
  • Hard start conditions
  • Rough idle or stalling

Common Causes

  • Damaged, burnt, shorted, corroded, or disconnected wiring and connectors
  • Defective throttle actuator
  • Defective throttle actuator position switch
  • Unauthorized performance settings in PCM
  • Failed or failing PCM or other control module

Diagnosis

  1. Record all fault codes and freeze frame data.
  2. Inspect wiring and connectors for damage or corrosion.
  3. Perform electrical checks on the throttle actuator circuit.
  4. Clear code after repairs and test drive to see if it returns.

Fixes

  • Replace damaged wiring, connectors, or faulty components like the throttle actuator or position switch.

FAQ

Can I fix P0639 myself?

DIY repair is possible for simple issues like wiring problems. However, complex CAN bus system faults may require professional diagnosis and repair.

What does 'bank 2' mean in this context?

'Bank 2' refers to the side of the engine that does not contain cylinder #1 on engines with two cylinder heads.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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