Where is (CMP) cam pos sensor
02-12-2023, 02:16 PM
#11
Thread Starter
Join Date: 02-09-2023
Location: eagle mountain, ut
Posts: 9
02-12-2023, 04:39 PM
#14
Senior Member
Join Date: 03-29-2022
Location: Davison MI
Posts: 1,037
I'll back up what donbrew said with this. The MAF and RPM are used to determine load. Load is a value used by the TCM to determine shift time and hardness. Any problem with a load value being off will make for strange or erratic shifts
02-12-2023, 04:55 PM
#15
Platinum Member
Join Date: 12-06-2009
Location: Alabama
Posts: 11,130
Uh….Nope. Not the reason for the strange shifts.
02-12-2023, 09:53 PM
#17
Platinum Member
Join Date: 12-06-2009
Location: Alabama
Posts: 11,130
No. I don’t. My HHR is a 5 speed but….
The OP stated he has a code P0102 showing. That is one of several codes that can cause a HHR to go into “ limp mode” (or whatever you call it). The car then will do those harsh shifts.
It’s been discussed on this site for years. Something in the OBD programming will create the harsh shifts to “ Get The Drivers Attention” that the CEL needs to be checked. GM’s way of getting your attention.
Like I said, been listening to the old timers on this forum talk about this for years. I have no reason to doubt this is what the OP is experiencing those hard shifts for.
If you want to tell me your HHR is different, then I’m all ears.
P.S. I turned wrenches for a living many years ago. Haven’t done it for money in a long time. Still work on my own stuff though.
The OP stated he has a code P0102 showing. That is one of several codes that can cause a HHR to go into “ limp mode” (or whatever you call it). The car then will do those harsh shifts.
It’s been discussed on this site for years. Something in the OBD programming will create the harsh shifts to “ Get The Drivers Attention” that the CEL needs to be checked. GM’s way of getting your attention.
Like I said, been listening to the old timers on this forum talk about this for years. I have no reason to doubt this is what the OP is experiencing those hard shifts for.
If you want to tell me your HHR is different, then I’m all ears.
P.S. I turned wrenches for a living many years ago. Haven’t done it for money in a long time. Still work on my own stuff though.
02-13-2023, 08:01 AM
#18
Senior Member
Join Date: 03-29-2022
Location: Davison MI
Posts: 1,037
No. I don’t. My HHR is a 5 speed but….
The OP stated he has a code P0102 showing. That is one of several codes that can cause a HHR to go into “ limp mode” (or whatever you call it). The car then will do those harsh shifts.
It’s been discussed on this site for years. Something in the OBD programming will create the harsh shifts to “ Get The Drivers Attention” that the CEL needs to be checked. GM’s way of getting your attention.
Like I said, been listening to the old timers on this forum talk about this for years. I have no reason to doubt this is what the OP is experiencing those hard shifts for.
If you want to tell me your HHR is different, then I’m all ears.
P.S. I turned wrenches for a living many years ago. Haven’t done it for money in a long time. Still work on my own stuff though.
The OP stated he has a code P0102 showing. That is one of several codes that can cause a HHR to go into “ limp mode” (or whatever you call it). The car then will do those harsh shifts.
It’s been discussed on this site for years. Something in the OBD programming will create the harsh shifts to “ Get The Drivers Attention” that the CEL needs to be checked. GM’s way of getting your attention.
Like I said, been listening to the old timers on this forum talk about this for years. I have no reason to doubt this is what the OP is experiencing those hard shifts for.
If you want to tell me your HHR is different, then I’m all ears.
P.S. I turned wrenches for a living many years ago. Haven’t done it for money in a long time. Still work on my own stuff though.
Anytime you experience shifting issues it's a good idea to look at these values first.
There's nothing wrong with what you mention it's just that it's not the only thing that can cause these issues. A partially plugged exhaust can cause it from the engine not breathing correctly. It can skew the MAF reading.
02-13-2023, 09:12 AM
#19
Moderator
Join Date: 01-23-2009
Location: Fredericksburg,VA
Posts: 24,795
Except that the ECM turns the TCM off when there is a performance related code, then the TCM shifts according to the tables with no feedback.
So, yes and no. Both are correct.
Don't forget the MAF is also the IAT, which has a big effect in extreme temperatures. The MAF and the IAT share the electrical supply in series, if the MAF shorts the IAT goes wonky.
So, yes and no. Both are correct.
Don't forget the MAF is also the IAT, which has a big effect in extreme temperatures. The MAF and the IAT share the electrical supply in series, if the MAF shorts the IAT goes wonky.
02-13-2023, 11:30 AM
#20
Premium Member
Join Date: 03-12-2017
Location: Phoenix
Posts: 1,134
Recently, as I was backing out of a parking space, so was the car on the other side.
We bumped into each other with no damage, but my CEL lit up.
SISU shifted hard (limp mode) all the way home.
I don't remember what the code was but it had somthing to do with a loose wire.
I just figured the 'bump' was just enough to jostle the connector.
Rechecked all connectors and then I then cleared the code and all went back to normal.
We bumped into each other with no damage, but my CEL lit up.
SISU shifted hard (limp mode) all the way home.
I don't remember what the code was but it had somthing to do with a loose wire.
I just figured the 'bump' was just enough to jostle the connector.
Rechecked all connectors and then I then cleared the code and all went back to normal.