I’ve seen a few different ways to solve this but still confused. Had it go into check engine and go into reduced power mode 2 times in the last 2 weeks. I cleared the codes and it seems to be running fine. Any idea what could be causing this? It’s a 2002 TB with 160k.
Not sure if it matters, but cleaned throttle body about 10k ago. Last month did new water pump fan clutch and coolant temp sensor.
Any advice appreciated. Was planning on taking wife and 1 year old on beach with it in 2 weeks, but a bit worried now.
This code is for the APP (accelerator pedal position) sensors. Essentially the code sets when the two of these sensors don't agree about where the accelerator pedal is positioned or one or both of the sensors is reporting an invalid value.
Since the two sensors use different 5 volt reference power supplies if one of those 2 power supplies has an issue like an intermittent short to ground or a high load it can affect the pedal sensor readings.
It is often suggested to disconnect the fan clutch to see if the issue goes away. This is done because the fan clutch uses one of the same power supplies as one of the APP sensors. But if the issue is infrequent this is not likely to be a good option since one should not just drive around for a long time without a working cooling fan.
When I face something like this I capture live data for the systems involved and hope to catch the issue in the act in the recorded data so I know better what to look for. With something that only happens once a week or so that can take quite a bit of time though.
Some will suggest to replace the APP sensor assembly. If money is no concern this may (or may not) help.
Unfortunately there is no simple quick fix for this.