Thread: New Member running in V4 mode

Hello to all, just joined the forum. I have an 08 GXP and its the first ls4 powered car ive owned so far.
I have owned other ls powered cars and trucks but first time ive run across DOD/AFM. So as soon as i bought car
it ran fine with the DOD working as it should switching between 8 and 4 cylinder modes. I decided to
disconnect the oil pressure sensor under throttle to disable DOD temporarily and it worked great never went into 4 cylinder mode.
I drove car this way for two days no issues and one day i drove up a parking ramp and it immediately switched to V4 mode
No more 8 cylinder functionality. Codes that I am getting are p0102 maf low voltage, p3401 p3425 p3441 p3449 basically cylinders
1,4,6,7 are deactivated no other codes present. Changed the maf with no difference in change. It starts runs and drives in V4 with no issues. Runs great in 4 cylinder mode.
Could this be maf wiring, ecm, I have no idea where to start, any hints would be very much appreciated, a plus is the fuel economy but its very dangerous in traffic, slow and all.

I run a Range DOD delete plug on my suburban. Keeps it in V8 mode all the time. It plugs into the OBDII port. I think it was $150.


Sent from my iPhone using Tapatalk

Ok so I will check fuses, didnt know maf sensor was tied into ign fuse. Thank you all for relpies will keep you posted.

did you try plugging the thing back in ?

I plugged the oil sensor back in no change. Checked all fuses related to the ecm/ign all good. What should i be checking for in the maf plug as far as voltage? Is ecm not sending proper voltage, allowing for deactivation?

Noticed that the ecm under the intake is not bolted down, going up ramp could the ecm have moved and possibly damage internally?

Has anyone with an ls4 powered car ever encounter this situation? Ive heard of getting stuck in v8 mode, I will start to check for voltage signals from the connector but would like to know what to look for in values. Thank you for the responses so far.

ok, Im going to inspect the harness, the maf voltage low is a parameter that sets the deactivation on? Thank you for the help will keep posted.

I did get a new maf carquest brand from advance. So i should just change that maf for an oem unit.

Originally Posted by Scottydoggs

the 2013 ss camaro i just bought has DOD. i tuned that crap off. made a difference in how it feels for sure.

I agree ! No drone after the switchover and responsive thru the whole throttle range.

I do not have a tuner [emoji3166] ( maybe i should) or even know if the 2012 suburban can be tuned. But heard stories and knew a guy at work who had to have the dealer tear into it and replace the DOD lifters and it does not sound fun.

So it was a cheap fix for me.

Not even sure i can say the gas mileage dropped 1/2 mpg. So i see no benefit for DOD other than CAFE marketing.


Sent from my iPhone using Tapatalk