Engine Oil Pressure sensor/switch issues

whostorm05 · May 20, 2022

Interestingly enough the service manager seemed to not know this was an issue until he talked to the parts department. I think he was geniunely concerned especially after seeing the invoice stated I was sold a mopar oil filter, so perhaps he truly didn't know. I was very polite on the call.

Dusty · May 24, 2022

Margins.

I'm not trying to impugn the motives of the OPs dealer, but depending on the quantity buy of oil filters from Mopar, the dealer cost of a MO-889 is between $9-10 dollars.

Many (most?) of the dealers around here, Ram or otherwise, are using aftermarket oil filters. My dealer and the Ford dealer down the street use a filter labelled, 'Mighty.' I've been told these are about $5 dealer cost. My neighbor's Buick has a white oil filter that doesn't even have a name, just a part number. It is not an AC.

Regards,
Dusty
2019 Ram 1500 Billet Silver Quad Cab 2WD, 5.7 Hemi, 8HP75, 3.21 axle, 33-gallon fuel tank, factory dual exhaust, 18” wheels. Build date: 3 June 2018. Now at 70140miles

whostorm05 · May 24, 2022

So got the new filter on there, still had intermittent oil pressure sensor switch readings.

If you didn't see my other thread, I was also having transmission issues with it intermittently going into 4th manual and not drive.

I decided to try pulling each plug to the PCM on the passenger side of the truck by the firewall. There were 4 plugs total.

The very first plug closest to the passenger side of the truck had visible water standing in it.

I've dried it up as best as I can and sprayed canned air into it. Now my question is where in the world did the water come from and is it in the PCM itself as well and not just the connector.

The other 3 connectors were bone dry.

Does anyone have a diagram which shows what all that very first plug is used for?

So far the oil pressure sensor is reading data again, but the transmission is still intermittently going into 4th.

Dusty · May 25, 2022

whostorm05 said:
So got the new filter on there, still had intermittent oil pressure sensor switch readings.

If you didn't see my other thread, I was also having transmission issues with it intermittently going into 4th manual and not drive.

I decided to try pulling each plug to the PCM on the passenger side of the truck by the firewall. There were 4 plugs total.

The very first plug closest to the passenger side of the truck had visible water standing in it.

I've dried it up as best as I can and sprayed canned air into it. Now my question is where in the world did the water come from and is it in the PCM itself as well and not just the connector.

The other 3 connectors were bone dry.

Does anyone have a diagram which shows what all that very first plug is used for?

So far the oil pressure sensor is reading data again, but the transmission is still intermittently going into 4th.

It's hard to say. Water shorts can most certainly take out a driver or pull-up resister if the right circuits are crossed.

However, the better way to troubleshoot this kind of problem is to start with a trouble code, then troubleshoot the relevant circuitry.

You may have to have a technician pursue this using scan tool diagnostics.

Good luck.

Regards,
Dusty
2019 Ram 1500 Billet Silver Quad Cab 2WD, 5.7 Hemi, 8HP75, 3.21 axle, 33-gallon fuel tank, factory dual exhaust, 18” wheels. Build date: 3 June 2018. Now at 70188 miles

whostorm05 · May 25, 2022

Dusty said:
It's hard to say. Water shorts can most certainly take out a driver or pull-up resister if the right circuits are crossed.

However, the better way to troubleshoot this kind of problem is to start with a trouble code, then troubleshoot the relevant circuitry.

You may have to have a technician pursue this using scan tool diagnostics.

Good luck.

Regards,
Dusty
2019 Ram 1500 Billet Silver Quad Cab 2WD, 5.7 Hemi, 8HP75, 3.21 axle, 33-gallon fuel tank, factory dual exhaust, 18” wheels. Build date: 3 June 2018. Now at 70188 miles

I have tried multiple scan tools and wasn't coming up with much. Is there a seperate TCM on a 2010? I was reading PCM codes.

The oil pressure switch issue has went away once the water was cleaned up. Going to clean up all 4 PCM connectors tomorrow using wd-40 electrical cleaner and then see what the transmission does.

Dusty · May 28, 2022

whostorm05 said:
I have tried multiple scan tools and wasn't coming up with much. Is there a seperate TCM on a 2010? I was reading PCM codes.

The oil pressure switch issue has went away once the water was cleaned up. Going to clean up all 4 PCM connectors tomorrow using wd-40 electrical cleaner and then see what the transmission does.

I believe there was a separate TCM in 2010, and yes, there are specific transmission fault codes (P1Ds, etc.). My son's code reader does not bring up transmission codes, but that may be the result of its age. But I think some readers will not, like some don't read ABS codes.

Regards,
Dusty
2019 Ram 1500 Billet Silver Quad Cab 2WD, 5.7 Hemi, 8HP75, 3.21 axle, 33-gallon fuel tank, factory dual exhaust, 18” wheels. Build date: 3 June 2018. Now at 70366 miles

Engine Oil Pressure sensor/switch issues

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