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2007 G35 COUPE AT P1564, P1757, P0021 - Possible Transmission issues
so my 2007 g35 coupe is having some issues, most likely transmission replacement is needed. It is very very sluggish accelerating from a dead stop. Sometimes at red lights you can take your foot off the break and it will not move at all, and on the highway it sometimes is going above 4500 RPM and struggling to get to 60 mph. Two mechanics believe it is slipping gears and the faulty transmission is the issue. It is generating the following 3 codes, P1564, P1757, P0021. Has anyone experienced this before? Also does anyone have any recommendations on the best site to shop used and rebuilt transmissions? Thank you in advance. I'm ready to let the vehicle go, but this is the worst time to be car shopping I've ever seen. The mileage is currently at 120k
P0021 the ECM is sending the signal to advance the bank2 intake cam but the cam sensor is showing that it's not advancing enough.
This is a somewhat common and notorious issue on the HR engine due to cracking galley gaskets, on the DE though it's usually associated with the camshaft solenoid getting debris on the little internal screens or just due to not fully snapping open. You can bench test the solenoid, look up a youtube video. Usually though you just disassemble it and see if there is a bunch of crap all over the screens blocking oil flow.
There are other possible reasons but on the DE it's usually from the solenoid being worn like I described.
P1564, ASCD (cruise control) switch malfunction. Flip the switch back and forth and see if it's sticky, sometimes people will do things like spill a sugary coffee or soda drink on their steering wheel and it gums up the switch so it doesn't return to where it's supposed to rest. Check ALL the cruise buttons, the on/off, set, and speed up/down switches. If they seem ok then it's probably the clock spring in the steering wheel which is another somewhat common fail item on these cars.
P1757 is a transmission code for a failing front brake solenoid circuit, usually it's not actually the solenoid itself but rather the flat wire/pin that attaches the harness to the TCM snapping. Fairly simple to diagnose and repair but if that pin isn't damaged then have another solenoid handy to replace the other one with. They do fail with age but it's almost ALWAYS the pin snapping on the harness. Here is a picture of what it looks like. Another easy fix with some basic soldering skills, if you need to see how to remove the TCM look up an installation for the TransGo shift kit for this car, it's pretty straightforward, just a handful of bolts on a few components. Torque specs are in both the TransGo instructions as well as the FSM section AT - Automatic Transmission.
So what If u have p1757 but u have an internal tcm I changed front brake solenoid nothing an how many quarts of transmission fluid does it take after taking out valve body
So the issue has returned. I know a place that sells used g35 transmissions from Japan that are removed at 60k miles. I was ready to put one in but a tranmission shop told me unless you have some kind of aftermarket consulate 3 workaround, these transmission are unique to the VIN number and Infiniti will work with you on reprogramming them. The place selling the replacement transmission says there is only about a 2% chance of these needing to be reprogrammed and its based on a certain chasis. The guy an the Transmission shop was very knowledgeable of this common Nissan issue and deals with a lot of him so I'm not sure who to agree with. Before I drop $500 plus install on a used 60k transmission from Japan can any one tell me if this would work or not work? info on my car is below. Thank you. I'm very attached to my baby and not ready to let her go yet, but solenoid valve replacement are so high right now that this would be over 4k to rebuild and install at the present moment so the used transmission from Japan would be a big money saver if I know it will work.
Infiniti G35 VIN Decoder
2007 INFINITI G35 Coupe 2dr Auto
Summary Style & Trim Equipment Colors Tech Specs Narrow Down By Style 2dr Auto
Manufactured ByJapan Infiniti Passenger CarSuspension Type - FrontMulti-Link Suspension Type - RearMulti-Link Front Tire SizeP225/45WR18, P225/40YR19, P225/50VR17 Rear Tire SizeP245/45WR18, P245/40YR19, P235/50VR17 Brake ABS System4-Wheel Front Brake Rotor Diam x Thickness12.6 x 1.1 in Rear Brake Rotor Diam x Thickness12.1 x 0.6 in Wheelbase112.2 in 112.2 min 112.2 max
Used transmissions don't need to be reprogrammed, just make sure that the donor transmission is the same HARNESS PLUG on the tranny. The older ones uses 3 harnesses that were 2green 1black and mounted to the side of hte tranny with external wiring, the newer style harness is just a single plug on the transmission.
A NEW TCM will require programming, a USED TCM (like from a JDM importer) will not.
Also, you would just use the existing TCM from your transmission and put it in the donor tranny, it requires removing the valve body and unbolting the TCM from the back of it.
Out of curiosity, what exactly was the fix the last time? Did the tranny shop find a broken pin like that video I linked?
Used transmissions don't need to be reprogrammed, just make sure that the donor transmission is the same HARNESS PLUG on the tranny. The older ones uses 3 harnesses that were 2green 1black and mounted to the side of hte tranny with external wiring, the newer style harness is just a single plug on the transmission.
A NEW TCM will require programming, a USED TCM (like from a JDM importer) will not.
Also, you would just use the existing TCM from your transmission and put it in the donor tranny, it requires removing the valve body and unbolting the TCM from the back of it.
Out of curiosity, what exactly was the fix the last time? Did the tranny shop find a broken pin like that video I linked?
So the issue was exactly as you described. It was fixed but the codes and troubles came back a month later. Right now they have a JDM replacement in there, but the issue may be the shifter. It wouldn't allow me to upload the video. They are working on it now. It won't allow me to upload the video
Post the video to youtube and then put the link here. It will automatically embed the video.
So the shifter issue is resolved. A pin realignment was needed. The JDM transmission swap was completed and it still has the same acceleration issue. The mechanic says he is pretty sure it must be the throttle bodies need replaced. Any thoughts?
I'm very suspicious of the problem being a throttle body, usually they either work or they throw a code if not working on these vehicles. Hopefully it fixes your issue though, they will need to perform both the throttle closed position and idle air recalibration after removing/cleaning the throttle body.
If they work the butterfly plate by hand they're just going to break the thing and then you'll end up buying a new throttle body. You have to keep it plugged in and have someone stand on the gas pedal to open it using it's own motor when cleaning it, or put a brick on the gas pedal to hold it down.
Since you previously threw a P0021 code I'd be more focused on doing things like cleaning the cam actuator on that bank, swapping the cam sensors from bank1 to bank2 to see if that code shifts over to bank1, things of that nature. P0021 means the ECM target cam angle (cam actuator duty cycle) isn't matching what the actual cam angle is as read by the cam phase sensor.
P0021 or a cam advance issue will definitely cause a huge drop in power especially at mid/high rpm.
Got this back from the mechanic We are not getting any codes. Besides the clock spring the oddest thing I have seen
Pedal was relearning with the Autel and the snap on scanner
We pulled the cats and looked they are fine good air flow
Swapped the mass air flow with a know good one. Oil level is great
The same way you brought it in.
07-12-2021, 10:53 PM
