Well here's another P2135 issue. Seems that this is a chronic problem with everything GM has built for some time.

I have a 2011 HHR 2.2 l with 44000 miles. First occurrence of the problem was about 6 weeks ago. Happened once and went away after the ignition was switched off and the car sat a few minutes. Was fine for a month and then started to fail frequently. The problem always clears after shutting down and restart. Obviously an intermittent issue.

Step one was get the code read at Auto Zone. P2135, Throttle position sensor 1 - 2 correlation. ECM has detected that TPS 1 and TPS 2 disagree more than 4.5 percent for less than 1 second.

OK. I've read numerous posts regarding this issue and went out and bought both Chilton and Haynes manuals for this thing. Neither manual has the electrical schematic for the engine control system in it. Wonderful!!

I read somewhere that the APP sensor on the gas pedal is TPS 1 and the throttle plate sensor in the throttle body is TPS 2. Please advise if this is correct? Or are both TPS 1 and TPS 2 on the throttle body? A redundant setup similar to what would be used in an aviation.

So far I have replaced the Accel Pedal assy, spraying it's connector with contact cleaner and applying dielectric lube. No help.

I've removed the 2 connectors from the PCM and sprayed them with contact cleaner, no help.

I've disassembled the connector on the throttle body and cleaned and lubed as above. After doing so the problem went away for about a week. Came back today. So I went out and soldered the wires on the connector, just in case of bad crimp. No help. I can find no evidence of broken wires at the throttle body connector or at the APP connector. I'm a little intimidated by the PCM connectors since I have no schematic to refer to.

Can anyone tell me which wires on the throttle body connector are the wires for the sensor? Which pins do they go to on which of the PCM connectors. Same for the APP sensor. This would help immensely. Or better yet, where can I get the schematics for this system?

I am about to order a new throttle body from GM parts direct. Even after shipping it's 100 bucks cheaper than buying from a dealer.

Sorry for the long past. Any help appreciated.

 

Since it's a 2011, have you considered seeing if it's covered by the powertrain warranty?

 

I know that tps 1 is on the accelerator pedal and sensor 2 is built into the throttle body. The code is saying that the computer is not seeing the throttle body tps sensor move when it sees the tps sensor on the pedal move. (Simple terms).

Popular problems is in the wiring (broken or loose pins) or the throttle body gears strip.

You stated that after you unplugged clean the throttle body connector you problem was no longer there for a short time. I myself would look at the throttle body wiring a little more it souls like you may have been close to the problem.

Pull on the wires at the throttle body and make sure the wires are not broken inside the insulation.

 

Firemangeorge has a good point. Don't hurt to ask that question.

Here is a youtube video that shows some good inspections of the throttle body wiring. It is not an hhr or the code your chasing but the inspection procedure is the same.

 

Hey Al,

Sorry to hear that you have been experiencing this with your HHR. I'd be happy to help if you decide that the repair is more than you wanted to take care of yourself.

Sincerely,

Jonathan A.
Chevrolet Customer Care

 

Jonathan

I need to get hands on some schematics for this system. No diagrams for it in Haynes or Chilton. Can't properly troubleshoot without the prints. Can you help with that?

This thing only faults when the accel pedal is in idle position. It's happened at 55 mph, it's happened while stopped and in park. But always the accel pedal has no pressure on it when the fault occurs.

I'm certain that the wires at the throttle body and within a foot of same are OK. Should be no trouble with the connector itself. The socket crimps have been soldered to eliminate any crimp issues. The accel pedal assy has been replaced.

The car faulted on me 4 times today on an 11 mile round trip to my gym. Just for grins, I took a small hammer and did some light maletizing on various points on the throttle body. Drove the car 30 miles after that with no faults. No, I don't think it's fixed. Just
"adjusted".

I have a strong suspicion that the sensor pots or whatever they are inside the throttle body have an intermittent issue in the idle position. So I ordered one from GM Parts Direct.

Do you have any further wisdom for me? Wiring diagrams??

 

Al, have you noticed the SEARCH box at the top of the page? If you were to put your OBDII code into it you would find many threads on the subject.

And then read them, they would probably be helpful.

 

So. My question about possibly being covered by warranty?????

Fwiw. Jonathan or ChevroletCustomerService, is just an internet middle man that can get you in touch with a dealer or rep. They don't diagnois. Don't give repair advice. And surely don't give out wiring diagrams.

 

I don't know what possible good wiring diagrams would be. A wire goes from the accel pedal to the computer; A wire goes from the computer to the throttle body. There is a sort of step motor relationship.

 

Hi Al Chapman,

We aren't able to post any information publicly. But we've sent you a private message that will hopefully help with your search. Please let us know if you haven't received it yet.

Amber N. (assisting Jonathan)
Chevrolet Customer Care