Reduced engine power...what causes this? Tune? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

San2cci · 11-06-2018, 06:52 AM

I was driving down the road after driving all morning and my car started violently shaking and I could only get up to about 10mph. Every light came on the dash. I pulled over and let the car sit and then it started up fine. Now I have a CEL code P2135. I've had an SS 4 years before my ZL1 and never had this happen. I just recently got a email tune from Steve at RDP. That's the only thing I've done differently. Should I flash back to stock? Any help is appreciated. Thanks.

el ess A · 11-06-2018, 07:42 AM

P2135 has something to do with your throttle plate position to the signal it's sending to the PCM. It's a starting point.

BAH2SS · 11-06-2018, 08:10 AM

Quote:

Originally Posted by San2cci

I was driving down the road after driving all morning and my car started violently shaking and I could only get up to about 10mph. Every light came on the dash. I pulled over and let the car sit and then it started up fine. Now I have a CEL code P2135. I've had an SS 4 years before my ZL1 and never had this happen. I just recently got a email tune from Steve at RDP. That's the only thing I've done differently. Should I flash back to stock? Any help is appreciated. Thanks.

Either throttle body or accelerator pedal position sensor

SSEssence · 11-06-2018, 09:20 AM

Do you have a VTC? that usually causes that

WoodBoss · 11-06-2018, 10:47 AM

What the P2135 code means. This particular trouble code indicates that the Power Control Module (PCM) has detected an erroneous reading regarding the voltages transmitted by throttle position sensor A or B, the accelerator pedal position sensor and or the actual throttle plate. A ported throttle body or one of those Vitesse units could cause this.

San2cci · 11-06-2018, 10:58 AM

I dont have either a ported throttle body or whatever this vitesse thing is. The only thing done differently was the email tune I got from Steve at RDP. Could any of the parameters that get tuned cause this? I'm afraid to drive the car in the event that this will happen on a highway. Thanks guys

SSEssence · 11-06-2018, 11:02 AM

I would reach out to Steve directly, he's usually pretty helpful for troubleshooting.

HyperV117 · 11-06-2018, 11:50 AM

I assume the tune flashed without any problems?

Edit: I see Steve is already on it. I'm sure you guys will figure it out.

fz4k98 · 11-06-2018, 06:36 PM

Quote:

Originally Posted by HyperV117

I assume the tune flashed without any problems?

Edit: I see Steve is already on it. I'm sure you guys will figure it out.

Try removing and cleaning the throttle body and mag sensor. It is a known problem on gm vehicles and I had success doing it. The carbon buildup is not much but messes with tps.

PeteD · 11-06-2018, 08:22 PM

Be sure to check the wires going into the throttle body. These cars are notorious for having issues in the harness at that location

oslouie · 11-06-2018, 09:05 PM

Quote:

Originally Posted by BAH2SS

Either throttle body or accelerator pedal position sensor

^^^this. I had the same issue and gradually got worse, enough to the point where it happened 90% of the time leaving work. After some research, I ended up replacing the throttle body and accelerator pedal. The problem never came back. It has something to do with one not being able to communicate with the other, which puts your car into limp mode. You can find a way to troubleshoot whichever part need to be replaced but both were cheap enough on eBay that I didn't bother with narrowing it down.

christianchevell · 11-07-2018, 07:20 AM

Solid advice from over the years..... its the throttle body needing cleaned tightened etc...or even more likely the Pedal assembly which has the dang potentiometer in it that limits the power by delay with drive by wire.... and others have had to replace one or the other.

San2cci · 12-24-2018, 10:58 PM

Just an update: I installed a new throttle position sensor ($50) rather than installing a whole new throttle body. So far so good. I've driven the car multiple times and I haven't had the issue return. Before it would happen pretty much every time I drove for more than 10 minutes.

This install was pretty easy and straightforward. Just a matter of removing the throttle body assembly from the car and removing a few clips which hold the position sensor in place. May need to adjust the throttle body plate into different positions to get the new sensor to line up correctly. Install new clips and bolt throttle body assembly back on. I also took it upon myself to clean the throttle body while I had it out. It did have some buildup on the plate which cleaned up fairly easily. Also I checked on the connection of the accelerator pedal harness. I removed it and reinstalled it to make sure it had a good connection.

If it does occur again my next step will be to replace the accelerator pedal assembly (about $120).

Merry Christmas!

San2cci · 04-20-2019, 12:41 PM

Some more updating....swapping the throttle position sensor did not solve the issue. It eventually returned. The next thing I did was replaced my accelerator pedal assembly. This also did nothing for me. At this point I returned my car back to the stock tune, and it still eventually went into the reduced engine mode. I brought it to Chevy and they ran some tests and said the wiring is fine and suggested I replace my throttle body. They wanted close to $700 for this so I just picked my car up and ordered an OEM AC Delco throttle body through advanced auto. Had a $50 off coupon so it cost about $180 shipped to my house. I'm reusing the throttle body gasket as it is in great condition. These do not come with the new throttle body and cost about $15. Replacing the throttle body is very simple. I'll update in a few weeks, hoping the new throttle body will correct the issue.

11-06-2018, 06:52 AM	#1
San2cci Drives: 2013 silver ice metallic ZL1 Join Date: Jan 2013 Location: Camden County, NJ Posts: 730 View My Garage	Reduced engine power...what causes this? Tune? I was driving down the road after driving all morning and my car started violently shaking and I could only get up to about 10mph. Every light came on the dash. I pulled over and let the car sit and then it started up fine. Now I have a CEL code P2135. I've had an SS 4 years before my ZL1 and never had this happen. I just recently got a email tune from Steve at RDP. That's the only thing I've done differently. Should I flash back to stock? Any help is appreciated. Thanks.

11-06-2018, 07:42 AM	#2
el ess A Older Than Dirt Drives: 2010 & 2013 Camaros Join Date: Apr 2010 Location: Aiken, SC Posts: 4,563	P2135 has something to do with your throttle plate position to the signal it's sending to the PCM. It's a starting point. __________________ 2010 2SS TE, 1 of 822/2013 Camaro ZL1 vert, 1 of 54

11-06-2018, 09:20 AM	#4
SSEssence Instagram: Sangstah Drives: 2019 Camaro 1LE Join Date: Sep 2016 Location: Buena Park, CA. Posts: 2,800 View My Garage	Do you have a VTC? that usually causes that __________________ 2019 SS 1LE - "CaSSandra" 2014 SS - "AleSSandra - Sold" 94 Z28 - Sold Follow the build https://www.camaro6.com/forums/showthread.php?t=612717

11-06-2018, 11:02 AM	#7
SSEssence Instagram: Sangstah Drives: 2019 Camaro 1LE Join Date: Sep 2016 Location: Buena Park, CA. Posts: 2,800 View My Garage	I would reach out to Steve directly, he's usually pretty helpful for troubleshooting. __________________ 2019 SS 1LE - "CaSSandra" 2014 SS - "AleSSandra - Sold" 94 Z28 - Sold Follow the build https://www.camaro6.com/forums/showthread.php?t=612717

11-06-2018, 11:50 AM	#8
HyperV117 Drives: 2010 Camaro 1SS Join Date: Nov 2015 Location: CA Posts: 358	I assume the tune flashed without any problems? Edit: I see Steve is already on it. I'm sure you guys will figure it out. __________________

11-06-2018, 10:47 AM	#5
WoodBoss "Old School" Drives: 2010 2SS L99 Join Date: Apr 2015 Location: Sherrills Ford, NC Posts: 1,295	What the P2135 code means. This particular trouble code indicates that the Power Control Module (PCM) has detected an erroneous reading regarding the voltages transmitted by throttle position sensor A or B, the accelerator pedal position sensor and or the actual throttle plate. A ported throttle body or one of those Vitesse units could cause this.

11-06-2018, 10:58 AM	#6
San2cci Drives: 2013 silver ice metallic ZL1 Join Date: Jan 2013 Location: Camden County, NJ Posts: 730 View My Garage	I dont have either a ported throttle body or whatever this vitesse thing is. The only thing done differently was the email tune I got from Steve at RDP. Could any of the parameters that get tuned cause this? I'm afraid to drive the car in the event that this will happen on a highway. Thanks guys

11-06-2018, 08:22 PM	#10
PeteD Drives: 2012 2SS Victory Red with white st Join Date: Jun 2016 Location: NC Posts: 1,612	Be sure to check the wires going into the throttle body. These cars are notorious for having issues in the harness at that location __________________ My YouTube channelhttps://www.youtube.com/channel/UCid...AUbfN2HOE71B9w

11-07-2018, 07:20 AM	#12
christianchevell old school chevy rodder Drives: 2013 2SS/RS Manual,DM exhaust,CRT Join Date: Jul 2012 Location: Oregon Posts: 5,588 View My Garage	Solid advice from over the years..... its the throttle body needing cleaned tightened etc...or even more likely the Pedal assembly which has the dang potentiometer in it that limits the power by delay with drive by wire.... and others have had to replace one or the other. __________________ 2021 Wild Cherry ZL1 A10, Sunroof, Data, Carbon, Nav, RotoFab Dry CAI, Elite x2, Borla ATK, Driveshaft shop

12-24-2018, 10:58 PM	#13
San2cci Drives: 2013 silver ice metallic ZL1 Join Date: Jan 2013 Location: Camden County, NJ Posts: 730 View My Garage	Just an update: I installed a new throttle position sensor ($50) rather than installing a whole new throttle body. So far so good. I've driven the car multiple times and I haven't had the issue return. Before it would happen pretty much every time I drove for more than 10 minutes. This install was pretty easy and straightforward. Just a matter of removing the throttle body assembly from the car and removing a few clips which hold the position sensor in place. May need to adjust the throttle body plate into different positions to get the new sensor to line up correctly. Install new clips and bolt throttle body assembly back on. I also took it upon myself to clean the throttle body while I had it out. It did have some buildup on the plate which cleaned up fairly easily. Also I checked on the connection of the accelerator pedal harness. I removed it and reinstalled it to make sure it had a good connection. If it does occur again my next step will be to replace the accelerator pedal assembly (about $120). Merry Christmas!

04-20-2019, 12:41 PM	#14
San2cci Drives: 2013 silver ice metallic ZL1 Join Date: Jan 2013 Location: Camden County, NJ Posts: 730 View My Garage	Some more updating....swapping the throttle position sensor did not solve the issue. It eventually returned. The next thing I did was replaced my accelerator pedal assembly. This also did nothing for me. At this point I returned my car back to the stock tune, and it still eventually went into the reduced engine mode. I brought it to Chevy and they ran some tests and said the wiring is fine and suggested I replace my throttle body. They wanted close to $700 for this so I just picked my car up and ordered an OEM AC Delco throttle body through advanced auto. Had a $50 off coupon so it cost about $180 shipped to my house. I'm reusing the throttle body gasket as it is in great condition. These do not come with the new throttle body and cost about $15. Replacing the throttle body is very simple. I'll update in a few weeks, hoping the new throttle body will correct the issue.