P2551 Fault Code

Torque Management Request Input Signal B High

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2551 fault code indicates that the Torque Management Request Input Signal B is reporting a high value, which can lead to issues with the vehicle's performance. This signal is part of the torque management system, designed to optimize engine power output and improve drivability. When the signal is excessively high, it may affect how the engine responds under load, potentially triggering reduced power and other performance issues.

What are the symptoms of the P2551 code?

Drivers may experience several symptoms when the P2551 fault code is present, such as:

• Decreased engine power or acceleration performance.
• Hesitation or stumbling during acceleration.
• Activation of the check engine light.
• Erratic transmission shifting or operation.
• Warning messages related to engine performance on the dashboard.

What causes the P2551 code?

Common causes for the P2551 fault code include:

• Faulty or shorted wiring in the torque management input circuit.
• Malfunctioning torque management sensors or components.
• Poor ground connections or electrical issues.
• An issue with the engine control module (ECM) or transmission control module (TCM).
• Software glitches or outdated firmware in the control modules.

How to fix P2551?

To resolve the P2551 fault code, the following steps may be taken:

• Inspect the wiring and connectors associated with the torque management system for damage or corrosion.
• Test the torque management sensors for proper operation and replace them if faulty.
• Check the ground connections and ensure they are secure and free of corrosion.
• Update or reprogram the ECM or TCM software to the latest version if applicable.
• Clear the fault code from the vehicle's computer and perform a road test to ensure the issue is resolved.