I have a 2004 crossfire limited. My fuel gauge sending unit is faulty. Ot reads a half tank although full and reads empty even though it will only take 5 gallons. I know its full because i remo ed the sending unit to put in a new one (which was the wrong one). I reassembled it until i got a new one. I was driving and shortly after the light came on the car started losing power and then died and would not restart. I added 2 gallons and it started up and ran perfectly. My question is could this false fuel reading tri k the ecm to shut down? I got 2 codes P0453 and P0151.

 

You said that you used the wrong unit. Have you replaced it with the correct unit?
I did a little searching and came up with these links for the codes that you stated. Hopefully, these will be helpful.
LINK - Po453

LINK - P0151

 

I did put the original back in so at lrast i had some indication of fuel level. The replacement would'nt register anything. I checked those codes. When i googled it this morning my own post was referenced, which i thought was funny. But the reply suggested that a false reading could cause the ECM to shut down the engine.

Fuel Pump Shutdown When EmptyThe fuel pump itself does not shut down solely because the fuel gauge reads empty. The fuel gauge and the fuel pump are separate systems, although they share a common electrical circuit through the fuel sending unit. The gauge reading empty is typically a symptom of a problem with the fuel sending unit, wiring, or gauge cluster, not a direct signal to shut down the pump. However, a faulty fuel sending unit can cause the fuel gauge to display an incorrect reading, such as empty when the tank is full. In some cases, a malfunctioning sending unit can lead to a loss of signal or an open circuit, which might be interpreted by the vehicle's Engine Control Module (ECM) as a critical fault. For instance, a user reported that their 2004 Chrysler Crossfire experienced a loss of power and engine shutdown after the fuel gauge falsely indicated empty, which coincided with the vehicle's inability to restart until fuel was added. The user received diagnostic trouble codes P0453 and P0151, suggesting the ECM may have reacted to the erroneous signal, potentially triggering a safety shutdown. Here is the google response. While the pump is not directly shut down by the gauge reading, an incorrect signal from the sending unit can lead to the ECM taking protective actions, such as limiting engine performance or preventing restarts, especially if the system interprets the signal as a critical fuel level issue. Therefore, although the pump does not shut down due to the gauge reading empty, a faulty sending unit can indirectly cause engine shutdowns by providing erroneous data to the ECM.

 

It sounds like the Po453 code indicates high or low pressure in the fuel tank. I assume that ma effect being able to pump / dispense fuel?

 

It sounds like the info you provided in your second post "Fuel Pump Shutdown When EmptyThe fuel pump itself does not shut down solely because the fuel gauge reads empty. The fuel gauge and the fuel pump are separate systems, although they share a common electrical circuit through the fuel sending unit. The gauge reading empty is typically a symptom of a problem with the fuel sending unit, wiring, or gauge cluster, not a direct signal to shut down the pump. However, a faulty fuel sending unit can cause the fuel gauge to display an incorrect reading, such as empty when the tank is full. In some cases, a malfunctioning sending unit can lead to a loss of signal or an open circuit, which might be interpreted by the vehicle's Engine Control Module (ECM) as a critical fault. For instance, a user reported that their 2004 Chrysler Crossfire experienced a loss of power and engine shutdown after the fuel gauge falsely indicated empty, which coincided with the vehicle's inability to restart until fuel was added. The user received diagnostic trouble codes P0453 and P0151, suggesting the ECM may have reacted to the erroneous signal, potentially triggering a safety shutdown. Here is the google response. While the pump is not directly shut down by the gauge reading, an incorrect signal from the sending unit can lead to the ECM taking protective actions, such as limiting engine performance or preventing restarts, especially if the system interprets the signal as a critical fuel level issue. Therefore, although the pump does not shut down due to the gauge reading empty, a faulty sending unit can indirectly cause engine shutdowns by providing erroneous data to the ECM." was generated by AI. IGNORE IT!

The malfunctioning full indicator may be the cause of your P0453 DTC. Repair the faulty tank full/empty valve. Clear all codes and take a few test drives. Scan the car again and see what DTC are set.

 

I had a high pressure in my fuel system. I had gas in my charcoal canister and issue with the Purge Valve sucking in excess gas from the charcoal canister causing unreliable running. Read through my thread, it might help.

https://www.crossfireforum.org/forum...-canister.html