Low oil pressure warning

[Shammy]

Received a low oil pressure warning on start up. Scanner revealed 5 codes:
- P06DB - engine oil pressure control circuit low
- P0034 - turbo bypass valve A control circuit low
- P06A0 - variable A/C compressor control circuit
- P2602 - coolant pump A control circuit low
- P2682 - engine coolant bypass valve A control circuit low

Gave her an oil change (some comments that oil nearing end of life could cause oil pressure issue on this engine), no joy. I also don't see any way to see actual oil pressure from PCM. I have a nice Autel MX808 scanner, the Ford app has no live data (that I can find anyway).

My first move would normally be swapping in a new oil pressure sensor but, only 12K on the truck and that's a lot of codes to all be secondary. Appreciate any experience, advice the community has on this.

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[Bsthroop]

Wondering with that many errors possibly a module issue. Also maybe low battery voltage?

 

[Shammy]

Wondering with that many errors possibly a module issue. Also maybe low battery voltage?

12.5v at startup, 15.2v at idle. No harm in charging the battery but seems fine. Bad PCM seems like a good candidate and simple enough to test ... for a dealer who has one laying around anyway. Anyone know if these engines have a history of ECU/PCM failure?

 

[RangerBill]

Received a low oil pressure warning on start up. Scanner revealed 5 codes:
- P06DB - engine oil pressure control circuit low
- P0034 - turbo bypass valve A control circuit low
- P06A0 - variable A/C compressor control circuit
- P2602 - coolant pump A control circuit low
- P2682 - engine coolant bypass valve A control circuit low

Gave her an oil change (some comments that oil nearing end of life could cause oil pressure issue on this engine), no joy. I also don't see any way to see actual oil pressure from PCM. I have a nice Autel MX808 scanner, the Ford app has no live data (that I can find anyway).

My first move would normally be swapping in a new oil pressure sensor but, only 12K on the truck and that's a lot of codes to all be secondary. Appreciate any experience, advice the community has on this.

These control solenoids are all fed with fuse F12 in the Battery Junction Box (BJB). I would check that fuse.

Also, Forscan can monitor engine oil pressure, but I think your problem lies with that fuse.

 

[Shammy]

These control solenoids are all fed with fuse F12 in the Battery Junction Box (BJB). I would check that fuse.

Also, Forscan can monitor engine oil pressure, but I think your problem lies with that fuse.

Fuse, you nailed it Bob. Thank you!!

 

[Dereku]

Fuse, you nailed it Bob. Thank you!!

Dang what an odd ball problem and awesome fix! Glad it worked out.

 

[IdahoRanger]

Interesting to see if it happens again but glad it was just a fuse.

 

[Frenchy]

If a fuse was blown i would start looking at different parts of the harness. Why you ask? Possible something rubbed and cause a short wich would cause the fuse to pop

 

[Shammy]

If a fuse was blown i would start looking at different parts of the harness. Why you ask? Possible something rubbed and cause a short wich would cause the fuse to pop

yea, I hear you. In the mean time I now have a 5 pack of those silly 3 prong fuses

 

[SigOris]

I’d schedule an appointment with the dealer, put bad fuse back in, have them replace and document issue in the event you other issues under warranty

 

[D Fresh]

I’d schedule an appointment with the dealer, put bad fuse back in, have them replace and document issue in the event you other issues under warranty

This.

Just replacing a fuse without finding out why it blew rarely fixes anything.

 

[Shammy]

I’d schedule an appointment with the dealer, put bad fuse back in, have them replace and document issue in the event you other issues under warranty

This.

Just replacing a fuse without finding out why it blew rarely fixes anything.

Unless you use a larger fuse . Joking. Agree, chasing electrical ghosts is no fun tho. Need to see how intermittent this is. I’ll keep this thread updated as the story unfolds.

 

[rydfree]

Unless you use a larger fuse . Joking. Agree, chasing electrical ghosts is no fun tho. Need to see how intermittent this is. I’ll keep this thread updated as the story unfolds.

Using a larger fuse usually tells you where the problem is though

 

[FunInTheSun]

Received a low oil pressure warning on start up. Scanner revealed 5 codes:
- P06DB - engine oil pressure control circuit low
- P0034 - turbo bypass valve A control circuit low
- P06A0 - variable A/C compressor control circuit
- P2602 - coolant pump A control circuit low
- P2682 - engine coolant bypass valve A control circuit low

Gave her an oil change (some comments that oil nearing end of life could cause oil pressure issue on this engine), no joy. I also don't see any way to see actual oil pressure from PCM. I have a nice Autel MX808 scanner, the Ford app has no live data (that I can find anyway).

My first move would normally be swapping in a new oil pressure sensor but, only 12K on the truck and that's a lot of codes to all be secondary. Appreciate any experience, advice the community has on this.

The most important clue here is the "control circuit" key word. If there was only a low reading from the oil pressure sensor, you would see the "Oil Pressure low" DTC. But the PCM is telling you that in addition to a low sensor reading, the 12V excitation (the control circuit) to the sensor is also out of limits (low), so it sets this DTC and not the "Oil Pressure Low" DTC.

Most sensors have several DTCs like this for any given sensor. They give a "sanity check" on a low reading. Other sanity checks exist, like the accelerator position sensor actually has two sensors in the same housing, and they have to match within a certain ratio limit, or this will set a DTC.

Very helpful for troubleshooting, as you can see.
(And as @Ranger Bill has so cleverly demonstrated.)
??️‍

 

[Jason B]

These control solenoids are all fed with fuse F12 in the Battery Junction Box (BJB). I would check that fuse.

Also, Forscan can monitor engine oil pressure, but I think your problem lies with that fuse.

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