Where is (CMP) cam pos sensor
Thread Starter
Joined: 02-09-2023
Posts: 9
From: eagle mountain, ut
Senior Member
Joined: 03-29-2022
Posts: 1,241
From: Davison MI
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
Platinum Member
Joined: 12-06-2009
Posts: 11,721
From: Alabama
Uh….Nope. Not the reason for the strange shifts.
Platinum Member
Joined: 12-06-2009
Posts: 11,721
From: Alabama
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.
Senior Member
Joined: 03-29-2022
Posts: 1,241
From: Davison MI
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.
Moderator
Joined: 01-23-2009
Posts: 26,539
From: Fredericksburg,VA
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.
Premium Member
Joined: 03-12-2017
Posts: 1,250
From: Phoenix
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.
