← Back to list

2001 Nissan Altima P0640 Code: Causes and Symptoms - Car Won't Stay Running

Model: 2001 Nissan Altima Fault Code: P0640 Posted: 2017-11-05 10:37

I'm experiencing a P0640 fault code on my 2001 Nissan Altima, and my car's RPM stays extremely low—making it impossible to keep the engine running. When I turn the key, the engine starts but immediately cuts off. Could this be related to the fuel level sensor or is there another underlying issue? I've already replaced the catalytic converter, flex pipe O2 sensor, and knock sensor with no improvement. The car also shows other codes: P325 and P731. Any insight into what might be causing this behavior?

Related fault codes

P0640

Comments (2)

Anonymous 2017-11-06 07:48

P0640 indicates a fault in the Intake Air Heater Control Circuit. This could affect engine temperature regulation, potentially contributing to unstable idle or engine shutdowns.

Anonymous 2017-11-06 08:54

The P0640 code may not directly cause RPM issues, but if the intake air heater circuit is malfunctioning, it can lead to poor combustion and intermittent engine shutdown. Since your car still cuts off even after replacing multiple sensors, consider checking the intake air temperature sensor or wiring harness for faults. Also, verify that the ECU has proper power and ground connections related to this circuit.