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.
Detection Condition
DTC P1464 indicates A/C Control Signal (ACCS) input to PCM was high during self-test. When A/C cycling switch opens, PCM will turn off A/C clutch. The A/C cycling switch circuit to PCM provides a voltage signal which indicates when A/C is requested. When A/C demand switch is turned on, both the A/C cycling switch and high pressure contacts of A/C high pressure switch are closed, voltage is supplied to ACCS circuit at PCM. If ACCS signal is not received by PCM, PCM will not allow A/C to operate.
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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.