Hello! Question, will B0429 pass inspection? State is New Jersey. Thank you!
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Polishblood
DTC B0429 Temperature Control #3 Rear Circuit Range/Performance which involves the HVAC
should not be a cause to fail of engine smog or safety inspections
should not be a cause to fail of engine smog or safety inspections
Yup - A "B" code is Body, not Powertrain ("P") so it's not an emissions fail.
As posted, it's the blend/routing door for HVAC air to the rear seat console stack.
Which make, model, year, trim level of vehicle do you own? It sure helps when we know what we're repairing.
Bookmark the below link and use it to define codes when you post them. Thanks and Welcome to CF !!!!
obdii.pro
For OBD-II codes -
P = Powertrain
B = Body
C = Chassis
U = electrical, data, circuit faults
As posted, it's the blend/routing door for HVAC air to the rear seat console stack.
Which make, model, year, trim level of vehicle do you own? It sure helps when we know what we're repairing.
Bookmark the below link and use it to define codes when you post them. Thanks and Welcome to CF !!!!
OBDII diagnostics. Trouble codes description for GM
OBDII diagnostics. Trouble codes description for GM
For OBD-II codes -
P = Powertrain
B = Body
C = Chassis
U = electrical, data, circuit faults
2004 Deville Base Model, 175k miles. I ordered the actuator, hopefully it removes the code. Good to know though that it shouldn't cause a failed inspection.
I had a p0410 (Secondary air injection (AIR) system malfunction) code pop up after replacing the TCC solenoid. Check for suction at the air pump inlet (no water) and air flow at the connection to the single check valve. Both suction and airflow was very good. Check valve looked significantly corroded and I replaced it today. p0410 code is gone, however p0171 (system lean, bank 1) and p0174 (system lean, bank 2) popped up immediately after installing the new check valve. Did not trigger check engine light.
I am hoping that after disconnecting/reconnecting the battery and driving the car 100-200 miles, p0171 and p0174 will go away after the computer relearns/adjusts to the new check valve?
Lastly, p0741 (TTC circuit performance/stuck off) has plagued my car permanently since 160k, and comes on each/every time after 41mph plus. Replacing the TCC solenoid a second time did not help, like it did the first time. Neither did changing back to non-synthetic tranny fluid. My deville's transmission only started acting up after switching to full synthetic (Valvoline maxlife) tranny fluid. Going back to non-synthetic actually helped temporarily.
I plan to do the "3rd gear" method , temporarily bypassing p0741, to pass inspection.
It would be such a shame to abandon my deville after being with it for so long and caring for it so well (every 3k with full synthetic). Driven it cross country from NJ to AZ and back. It's been in probably atleast 25 states. Never left me stranded. Other than it's few small yet important flaws, the car is pretty darn dependable. Never had starting issues. Been serviced by the dealership up until 80k. Been mechanically pampered since then.
To see it go because it can't pass inspection with one fault code that doesn't affect the car that much (with p0741 I still get 26mpg+), would be pretty ridiculous.
I will let you guys know how it goes lol. I learned and continue to learn alot by reading this forum!
I had a p0410 (Secondary air injection (AIR) system malfunction) code pop up after replacing the TCC solenoid. Check for suction at the air pump inlet (no water) and air flow at the connection to the single check valve. Both suction and airflow was very good. Check valve looked significantly corroded and I replaced it today. p0410 code is gone, however p0171 (system lean, bank 1) and p0174 (system lean, bank 2) popped up immediately after installing the new check valve. Did not trigger check engine light.
I am hoping that after disconnecting/reconnecting the battery and driving the car 100-200 miles, p0171 and p0174 will go away after the computer relearns/adjusts to the new check valve?
Lastly, p0741 (TTC circuit performance/stuck off) has plagued my car permanently since 160k, and comes on each/every time after 41mph plus. Replacing the TCC solenoid a second time did not help, like it did the first time. Neither did changing back to non-synthetic tranny fluid. My deville's transmission only started acting up after switching to full synthetic (Valvoline maxlife) tranny fluid. Going back to non-synthetic actually helped temporarily.
I plan to do the "3rd gear" method , temporarily bypassing p0741, to pass inspection.
It would be such a shame to abandon my deville after being with it for so long and caring for it so well (every 3k with full synthetic). Driven it cross country from NJ to AZ and back. It's been in probably atleast 25 states. Never left me stranded. Other than it's few small yet important flaws, the car is pretty darn dependable. Never had starting issues. Been serviced by the dealership up until 80k. Been mechanically pampered since then.
To see it go because it can't pass inspection with one fault code that doesn't affect the car that much (with p0741 I still get 26mpg+), would be pretty ridiculous.
I will let you guys know how it goes lol. I learned and continue to learn alot by reading this forum!
why not just clear the codes with the car's built in scanner? then let the car relearn. Wondering if you replaced the TCC solenoid with tranny out or just dropped the cradle a bit.
Did you check the wiring for the TCC?
Here is the schematic showing how it is wired.
Check for 12 volts on the pink wire in cavity U of the connector going into the transmission. The simplest way to check the PCM output that controls the TCC would to use a scan tool capable of commanding the TCC on. You could at least check continuity of the wire from the TCC to the PCM.
Here is the schematic showing how it is wired.
Check for 12 volts on the pink wire in cavity U of the connector going into the transmission. The simplest way to check the PCM output that controls the TCC would to use a scan tool capable of commanding the TCC on. You could at least check continuity of the wire from the TCC to the PCM.
Attachments
Keep in mind if having to go for a smog testing that on-board smog tests can take several drive cycles to get into a complete/passed state
Anytime DTCs are erased either by you or removing battery,
all tests are set back to a non-complete failed state
It is not about elapsed miles alone but how many cold to closed loop drive cycles
Before going to any smog inspection is using a OBD-II scanner is to look at the on-board smog tests and do not go for testing until the scanner shows all tests are in a complete state,
though some states will allow up to just 1 to be non-complete, you would have to check your county if they allow that
Anytime DTCs are erased either by you or removing battery,
all tests are set back to a non-complete failed state
It is not about elapsed miles alone but how many cold to closed loop drive cycles
Before going to any smog inspection is using a OBD-II scanner is to look at the on-board smog tests and do not go for testing until the scanner shows all tests are in a complete state,
though some states will allow up to just 1 to be non-complete, you would have to check your county if they allow that
I found it in a search, read the attached NJ Smog PDF, but in short it states
Non-continuous Monitors
• For gasoline vehicles, there are eight non-continuous readiness monitors:
• catalyst,
• heated catalyst,
• oxygen sensor,
• heated oxygen sensor,
• AC refrigerant,
• exhaust gas recirculation,
• secondary air, and
• evaporative emissions system.
• A vehicle of model year 1996-2000 is permitted to have two non-continuous
monitors not ready and still pass the readiness portion of the OBD test.
• A vehicle of model year 2001 or newer is only permitted to have one non-continuous monitor, not ready. (not-complete)
• There is no requirement for all non-continuous monitors to be supported
Hmm, never seen the refrigerant monitor on the readiness monitor before. Must be on fairly new vehicles. Mass only tests 06 and newer vehicles I believe and allows 1 not ready
A/C has always been part if I/M as to EPA Generic OBD
but for most vehicles show up as unsupported
![Image]()
but for most vehicles show up as unsupported
Here's what you're looking for .......... all too common ........... 1998 and later - from an OLD CF thread in Engines; Northstar.
![Image]()
Update...
Quick summary... replaced plenum/intake seals/injector o-rings and cleaned IAC valve/throttle body/intake manifold. After 15 miles, p0171 and p0174 have not come back. A little too early to tell if problem is fixed. Will update later. Car runs/idles a lot smoother.
Detailed summary... so I sprayed throttle body cleaner around the plenum, no change in idle. Checked for cracks with the snake camera again, could not find the small crack I saw before.
Since the replacement parts arrived (plenum, intake seals, injector o-rings) and I finally some free time, I decided to replace the parts I just mentioned.
I noticed a few things, a long hairline crack in the bottom of the plenum which goes through to the outside (see pictures), lots of oil/gas around the outside the intake seals (see pictures), all intake manifold bolts were finger tight at best, and I think I found where mice have been hiding (see picture).
I wonder if the hairline crack would have let air through. I suspect that intake manifold being loose was a bigger cause of the lean mixture codes. When reinstalling the intake manifold, I torqued the bolts to 89in/lbs, and I could tell that previously those bolts were nowhere close to that torque setting. I was leaning on the intake manifold heavily when replacing the secondary air check valve, so perhaps I moved the manifold slightly and caused it to leak?
Also the dorman intake seals that came with the plenum looked inconsistent with each other. I found a tear in one of the intake seals (see picture). I am glad I also ordered intake seals from fel-pro as well. The fel-pro seals were simply more consistent with each other. Not necessarily thicker or of better material than the ones from dorman. Also the dorman plenum isn't exactly the same as the original plenum (offset is off) however it is good enough.
Fingers crossed that the lean mixture codes are gone! If so, I will do the 3rd gear method for p0741, and hopefully pass inspection! My deville ran great, now is runs even better. I spent probably less than 2hrs taking everything off and putting it back on, however I spent 7-9hrs cleaning everything. It's a shame you can't clean the intake manifold easily. I am sure if you submerge it in some type of liquid for like a week you can get it completely clean out but what that liquid would be, I have no clue!
Quick summary... replaced plenum/intake seals/injector o-rings and cleaned IAC valve/throttle body/intake manifold. After 15 miles, p0171 and p0174 have not come back. A little too early to tell if problem is fixed. Will update later. Car runs/idles a lot smoother.
Detailed summary... so I sprayed throttle body cleaner around the plenum, no change in idle. Checked for cracks with the snake camera again, could not find the small crack I saw before.
Since the replacement parts arrived (plenum, intake seals, injector o-rings) and I finally some free time, I decided to replace the parts I just mentioned.
I noticed a few things, a long hairline crack in the bottom of the plenum which goes through to the outside (see pictures), lots of oil/gas around the outside the intake seals (see pictures), all intake manifold bolts were finger tight at best, and I think I found where mice have been hiding (see picture).
I wonder if the hairline crack would have let air through. I suspect that intake manifold being loose was a bigger cause of the lean mixture codes. When reinstalling the intake manifold, I torqued the bolts to 89in/lbs, and I could tell that previously those bolts were nowhere close to that torque setting. I was leaning on the intake manifold heavily when replacing the secondary air check valve, so perhaps I moved the manifold slightly and caused it to leak?
Also the dorman intake seals that came with the plenum looked inconsistent with each other. I found a tear in one of the intake seals (see picture). I am glad I also ordered intake seals from fel-pro as well. The fel-pro seals were simply more consistent with each other. Not necessarily thicker or of better material than the ones from dorman. Also the dorman plenum isn't exactly the same as the original plenum (offset is off) however it is good enough.
Fingers crossed that the lean mixture codes are gone! If so, I will do the 3rd gear method for p0741, and hopefully pass inspection! My deville ran great, now is runs even better. I spent probably less than 2hrs taking everything off and putting it back on, however I spent 7-9hrs cleaning everything. It's a shame you can't clean the intake manifold easily. I am sure if you submerge it in some type of liquid for like a week you can get it completely clean out but what that liquid would be, I have no clue!
Attachments
Good work. Yes, the Dorman intake port seals are not the cat's meow. Good for FelPro. Mouse and snake nests are common because the intake is dry and open to the valley (warm) at both ends. Keep a wadded up clothes dryer fabric softener sheet stuffed in each end at the intake manifold - rodents hate the smell.
The small crack in the rubber plenum (connector) lower area is common and is the usual cause of the P 0171 / P 0174 codes. (2000 - 2005 Northstar)
The coating inside the intake is of no consequence - condensed oil vapor from the PCV system - which uses a fixed orifice, not a rattle valve.
If you feel you need a new intake manifold, talk to Jake at Northstar Performance in Ontario (across the lake from you) or look in RockAuto.
![Image]()
The P 0741 is NOT going to go away unless you overhaul the transmission. $4700 at a GM dealership - and you'll get an off-the-shelf reman unit. If you ever get that crazy talk to Monster Transmission in Florida.
The small crack in the rubber plenum (connector) lower area is common and is the usual cause of the P 0171 / P 0174 codes. (2000 - 2005 Northstar)
The coating inside the intake is of no consequence - condensed oil vapor from the PCV system - which uses a fixed orifice, not a rattle valve.
If you feel you need a new intake manifold, talk to Jake at Northstar Performance in Ontario (across the lake from you) or look in RockAuto.
The P 0741 is NOT going to go away unless you overhaul the transmission. $4700 at a GM dealership - and you'll get an off-the-shelf reman unit. If you ever get that crazy talk to Monster Transmission in Florida.
Due to the intake manifold not properly torqued down, you can see leaking past all the seals which would affect fuel issues
That rubber coupler cracked would be unmetered air and also affect fuel trims
Mice or whatever nesting on top of valley pan, need to look closely as what wires they were eating and repairing if needed
Clean that up and maybe some type of rodent killer in there
That rubber coupler cracked would be unmetered air and also affect fuel trims
Mice or whatever nesting on top of valley pan, need to look closely as what wires they were eating and repairing if needed
Clean that up and maybe some type of rodent killer in there
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