DSX flex fuel issues CODE P0178

20Bluezl1 · 03-22-2021, 12:08 PM

Hello guys so I have a little issue going on and I can't seem to figure it out. I installed a DSX flex fuel sensor and I have got a remote tune and I'm getting code P0178 has nobody git this before?

I have made sure pin 38 is in correctly and took it apart 2 times to double check. And yes I removed the blue cover to make sure pin is even with the rest.

Is there a way to check power of some sort?

closs2sx · 03-22-2021, 12:43 PM

check your ground

Trochoidal · 03-22-2021, 12:46 PM

Make sure you’re connections are good. P0178 is low circuit. I’d suspect you’ll find a wiring issue.

20Bluezl1 · 03-22-2021, 12:47 PM

Quote:

Originally Posted by closs2sx

check your ground

Which ground? I don't remember the instructions having to ground anything.

Stephen12ZL1 · 03-22-2021, 01:24 PM

Bad sensor is possible and double check obvious connections

20Bluezl1 · 03-22-2021, 01:32 PM

Quote:

Originally Posted by Stephen12ZL1

Bad sensor is possible and double check obvious connections

Is there a way to determine a bad sensor?

20Bluezl1 · 03-22-2021, 02:20 PM

Picture of pin installed on 38

Trochoidal · 03-22-2021, 05:19 PM

You’re definitely in #38. Where are you getting power for the sensor? Coil?

20Bluezl1 · 03-22-2021, 05:37 PM

Quote:

Originally Posted by Trochoidal

You’re definitely in #38. Where are you getting power for the sensor? Coil?

I'm assuming yes I spoke to DSX and the plug from the sensor has 12v on the purple wire ground is good but im supposed to have 5v on the white wire coming from pin 38 and I have 1v. Don't know what it could be.

Trochoidal · 03-22-2021, 05:52 PM

Quote:

Originally Posted by 20Bluezl1

I'm assuming yes I spoke to DSX and the plug from the sensor has 12v on the purple wire ground is good but im supposed to have 5v on the white wire coming from pin 38 and I have 1v. Don't know what it could be.

I’m gonna backtrack here. Do you have HPTuners? Did DSX ask you to check the frequency to confirm your ground is good and also sensor is good?

20Bluezl1 · 03-22-2021, 06:19 PM

Quote:

Originally Posted by Trochoidal

I’m gonna backtrack here. Do you have HPTuners? Did DSX ask you to check the frequency to confirm your ground is good and also sensor is good?

Yes I have HPTuners.
This is exactly what they told me.

1.Turn key on
2. Unplug sensor
3. Test power on purple wire should be 12V ( I have)
4. Test power on white wire should be 5V ( don't have)
5. Test ground for continuity. ( I have)

So I figured out a way to test the ECU for 5V from pin 38. The power is there. I pulled pin out for the 20th time and noticed that the pin is a little defective. Might be the issue.

Scottyz · 03-22-2021, 06:39 PM

If you have a male pin, do a pin drag test. That should give you an idea if the pin is damaged or weak. Maybe the pin is actually pushing back into the connector. I’ve seen this many times over the years. I’ve at times wither replaced the pin or if I’ve been under pressure to get the machine going I will bend the retaining tab to get the pin to seat in the connector.
Check the connector too to make sure the retaining tooth isn’t broken or missing or damaged. If it is then you will need to order a new pin housing.

20Bluezl1 · 03-22-2021, 07:00 PM

Going to order this pig tail, it sucks that I'm in a time crunch and now this happens. It's the easiest mod and it's all screwed up.

Scottyz · 03-22-2021, 07:05 PM

Errr. Butt connector. In a pinch this will work or should but a better method I believe through experience is to solder that wire to the existing wire. My experience on all sorts of cars and different equipment. If it was lights I wouldn’t say much but for ecm stuff we as in my coworkers and I will typically solder unles it’s super windy amd snowing/rainy like a biotch.

03-22-2021, 12:08 PM	#1
20Bluezl1 Drives: 2020 Zl1 A10 Riverside Blue Join Date: Mar 2020 Location: NJ Posts: 1,227	DSX flex fuel issues CODE P0178 Hello guys so I have a little issue going on and I can't seem to figure it out. I installed a DSX flex fuel sensor and I have got a remote tune and I'm getting code P0178 has nobody git this before? I have made sure pin 38 is in correctly and took it apart 2 times to double check. And yes I removed the blue cover to make sure pin is even with the rest. Is there a way to check power of some sort?

03-22-2021, 12:43 PM	#2
closs2sx Drives: 1970 chevelle Join Date: Aug 2011 Location: Central NH Posts: 1,427	check your ground __________________ On Order 2018 ZL1 1LE Garnet Red Tint Coat Metallic MY Car 2015 Z06 Z07 Daytona Sunrise Orange Metallic Dads Car 2013 ZL1 vin 963 Crystal Red Tint Coat/Black Wheels Exposed Carbon Fiber Insert 6 Spd Manual

03-22-2021, 01:24 PM	#5
Stephen12ZL1 Drives: '21 ZLE A10 Join Date: May 2012 Location: Mechanicsville, VA Posts: 6,808	Bad sensor is possible and double check obvious connections __________________ '21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60' '17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold) '15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold) '12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold)

03-22-2021, 02:20 PM	#7
20Bluezl1 Drives: 2020 Zl1 A10 Riverside Blue Join Date: Mar 2020 Location: NJ Posts: 1,227	Picture of pin installed on 38 Attached Images

03-22-2021, 05:19 PM	#8
Trochoidal Drives: 2017 Camaro 2SS A8 Join Date: May 2019 Location: USA Posts: 1,656	You’re definitely in #38. Where are you getting power for the sensor? Coil? __________________ Roto-Fab w/sound tube delete, Katech ported TB, Pray IM, Velossa, DD side markers, DSX FF, UPR Catch can, Halo brace, My custom vent gauge pod Originally Posted by arpad_m - “Aww, yet another oil thread with almost the same question in the OP“

03-22-2021, 12:46 PM	#3
Trochoidal Drives: 2017 Camaro 2SS A8 Join Date: May 2019 Location: USA Posts: 1,656	Make sure you’re connections are good. P0178 is low circuit. I’d suspect you’ll find a wiring issue. __________________ Roto-Fab w/sound tube delete, Katech ported TB, Pray IM, Velossa, DD side markers, DSX FF, UPR Catch can, Halo brace, My custom vent gauge pod Originally Posted by arpad_m - “Aww, yet another oil thread with almost the same question in the OP“

03-22-2021, 06:39 PM	#12
Scottyz 2019 ZL1 1LE MY GOON Drives: 1980 Z28 Big Red. Join Date: Dec 2018 Location: Stoney Creek Posts: 2,061	If you have a male pin, do a pin drag test. That should give you an idea if the pin is damaged or weak. Maybe the pin is actually pushing back into the connector. I’ve seen this many times over the years. I’ve at times wither replaced the pin or if I’ve been under pressure to get the machine going I will bend the retaining tab to get the pin to seat in the connector. Check the connector too to make sure the retaining tooth isn’t broken or missing or damaged. If it is then you will need to order a new pin housing.

03-22-2021, 07:00 PM	#13
20Bluezl1 Drives: 2020 Zl1 A10 Riverside Blue Join Date: Mar 2020 Location: NJ Posts: 1,227	Going to order this pig tail, it sucks that I'm in a time crunch and now this happens. It's the easiest mod and it's all screwed up. Attached Images

03-22-2021, 07:05 PM	#14
Scottyz 2019 ZL1 1LE MY GOON Drives: 1980 Z28 Big Red. Join Date: Dec 2018 Location: Stoney Creek Posts: 2,061	Errr. Butt connector. In a pinch this will work or should but a better method I believe through experience is to solder that wire to the existing wire. My experience on all sorts of cars and different equipment. If it was lights I wouldn’t say much but for ecm stuff we as in my coworkers and I will typically solder unles it’s super windy amd snowing/rainy like a biotch.

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