P1689 GMC Code - Traction Control Delivered Torque Output Circuit

P1689 indicates an issue with the Traction Control Delivered Torque Output Circuit, which is responsible for communicating torque data between the engine control module (ECM) and the traction control system.

Symptoms may include the traction control or check engine light illuminating, reduced engine power, poor traction control performance, or erratic throttle response.

Common causes include wiring issues, a malfunctioning throttle actuator, a faulty ECM or traction control module, or poor electrical connections within the circuit.

While you may be able to drive, it is not recommended as you may experience reduced engine power and compromised traction control, which can affect safety.

Start by inspecting the wiring and connections in the traction control system for damage or corrosion. Use a scan tool to monitor data from the ECM and traction control module for irregularities.

Repairs may include fixing damaged wiring, cleaning or reconnecting electrical connectors, updating or reprogramming the ECM, or replacing faulty components like the throttle actuator or traction control module.

A diagnostic scan tool, a multimeter for electrical testing, and possibly a service manual for wiring diagrams will be needed to troubleshoot this code effectively.

Yes, a weak or failing battery can cause voltage irregularities that may trigger this code, so it’s important to check the battery's condition as part of the diagnosis.

Repair costs vary depending on the root cause. Minor wiring repairs could cost $100-$200, while replacing a throttle actuator or traction control module might cost $300-$800 or more.

Simply clearing the code without addressing the underlying issue will not fix the problem, and the code is likely to return. Proper diagnosis and repair are necessary.