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 64, App No. 3 Circuit Low (Models With Pcm): Notes
Accelerator Pedal Position (APP) module provides a voltage signal that changes relative to accelerator position. There are 3 sensors located within APP module that are scaled differently. DTC 64 will set when voltage is less than .25 volt for 2 seconds on APP No. 3 sensor.
PCM will default to input from APP No. 3 sensor being ignored. A current and history DTC will set but will not turn on SERVICE THROTTLE SOON light. Throttle will operate normally as long as there is only one sensor malfunctioning. If 2 different APP sensors have a malfunction, SERVICE THROTTLE SOON light will light and PCM will limit power. If 3 APP sensors malfunction, SERVICE THROTTLE SOON light will light and PCM will only allow engine to operate at idle.
- This step determines if DTC 64 is result of a hard failure or an intermittent condition.
- This step checks PCM and wiring.
- This step checks PCM and sensor signal circuit.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.