Error code

OBD2 P2638

OBD2P2638
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Torque Management Feedback Signal 'A' Range/Performance.

Severity

moderateCan drive, but performance may be affected and the issue could worsen over time.

Summary

P2638 indicates an issue with the torque management system's feedback signal A, which is related to performance or range problems in the engine control module (ECM) or transmission control module (TCM).

Common Causes

  • Wiring issues
  • Faulty ECM
  • Defective TCM

Fixes

FAQ

What does P2638 mean?

P2638 indicates a problem with the torque management system's feedback signal A, affecting performance or range in the ECM or TCM.

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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