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P2548

Torque Management Request Input Signal B

General electrical fault on the second torque-management request input B. Used when more than one module needs to request torque adjustments — typically TCM on input A and ABS/ESC on input B, or chassis vs powertrain. With B invalid, only the A-side request is honoured.

  • Check engine light: Yes
  • Emissions related: No
  • Repair difficulty: hard

Common causes

Ordered by how often each turns out to be the cause.

  • Open or shorted wire / invalid CAN messageCommon

Parts involved

  • Torque Management Input B

P2548 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.