Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC P1721: General Description
The park pawl actuator driver unit controls the park pawl actuator to switch to and unlock the P position. The park pawl actuator driver unit monitors the information from the IG1 signal to switch the park pawl actuator into operational control mode. If the IG1 signal information detected by the powertrain control module (PCM) and received via the F-CAN is ON and the IG1 signal information detected by the park pawl actuator driver unit is OFF for a set time, the PCM receives a malfunction from the park pawl actuator driver unit and stores a DTC.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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