P2638: The torque management feedback signal A gives readings outside the normal range
The torque management feedback signal A gives readings outside the normal range. It is usually the part, its wiring or a connector with poor contact.
| Code | P2638 |
|---|---|
| System | Engine and transmission |
| Group | P26xx, Auxiliary outputs and cooling |
| Type | Generic: it means the same on every make |
How to read and clear P2638 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P2638 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P2634 The fuel pump B control gives a higher signal than normal
- P2635 Fuel pump A has low flow or performs below expectations
- P2636 Fuel pump B has low flow or performs below expectations
- P2637 Fault in the torque management feedback signal between units
- P2639 The torque management feedback signal A gives a lower signal than normal
- P263A The control gives a lower signal than normal
- P263B The control gives a higher signal than normal
- P263C The glow plug control driver gives readings outside the normal range
What does code P2638 mean?
The torque management feedback signal A gives readings outside the normal range. It is usually the part, its wiring or a connector with poor contact.
How do you clear P2638?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P2638 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
