Code Problems

[gmaredd]

I keep having the same three codes coming up in my Excursion - P1391, P1393 and P1248. I just put in a new GPR and it didn't help. Am I looking at glow plugs, valve cover gaskets and a new wiring harness next? The crazy thing is that the truck starts fine and no white smoke. HELP PLEASE!

[blk99]

P1248 Turbo Boost Pressure Not Detected
P1391 Glow Plug Circuit Low Input Bank No. 1(Right)
P1393 Glow Plug Circuit Low Input Bank No. 2 (Left)

for 1248, check the connection at your MAP sensor and the hose going from the spyder to the MAP sensor... also check the boots on the intercooler pipes... your looking for any rips, tears, or cracks where a boost leak can occur....

1391 and 1393 together means that none of the glow plugs are getting power... so either you have another bad GPR, or its hooked up backwards, or both the left and right connections on the UVC harness's have come loose... they make upgraded clip so that wont happen again...

[gmaredd]

Originally Posted by blk99

P1248 Turbo Boost Pressure Not Detected
P1391 Glow Plug Circuit Low Input Bank No. 1(Right)
P1393 Glow Plug Circuit Low Input Bank No. 2 (Left)

for 1248, check the connection at your MAP sensor and the hose going from the spyder to the MAP sensor... also check the boots on the intercooler pipes... your looking for any rips, tears, or cracks where a boost leak can occur....

1391 and 1393 together means that none of the glow plugs are getting power... so either you have another bad GPR, or its hooked up backwards, or both the left and right connections on the UVC harness's have come loose... they make upgraded clip so that wont happen again...

I will check these things tonight. Is there any way to clean the MAP sensor or am I just looking for bad connections? As for the boots - are these just the ones up on top of the motor or are there more I should look at? Thanks for your help.

[gmaredd]

I checked the connection and hose on the MAP sensor and everything looks fine. Actually it all looked brand new, tight and clean. No cracks in any of the boots and all connections are tight. I found the connections on both valve covers and they were tight also.

So- I cleared the codes, plugged in and called it a night in hope things would clear up . NOT! I turned the key on this morning and waited for the wait to start light to go off - then the SES light turned on immediately just like before. So am I to assume that maybe both valve cover gaskets need to be replaced next or possibly the glow plugs as well? How can I check the valve covers without replacing them?

[blk99]

does the SES light go off after you start it?

[gmaredd]

Originally Posted by blk99

does the SES light go off after you start it?

No - stays on with the same three codes.
P1391
P1393
P1248