P2135 and Reduced Engine Power

Tech discussions on the L77 6.0L V8.
thirdgenfarmer
Posts: 64
Joined: Sat Apr 29, 2017 4:47 pm

P2135 and Reduced Engine Power

Post by thirdgenfarmer » Tue Mar 20, 2018 3:16 pm

Interesting issue I've had twice, about a full year apart.

Code P2135 Throttle Position Sensor A/B Voltage Correlation. Results in car entering a reduced power mode, loss of stabilitrak and abs.

Both times has occurred on the highway, and I had to pull off very quickly as I could not maintain a highway speed. Brakes did not work correctly - very pulsey and lots of weird vibration. Engine was shaking quite badly - maintaining about 1000 rpms at idle and in park. I cleared the code while the car was running and everything went back to normal - no check engine, stabiltrack or abs lights - and idle returned to normal.

My car stumbles a little bit at idle but not bad enough to be an issue by itself, however I think the issues are likely related.

From my research it looks like this is more common with some of the GM trucks - and is cured by replacing the TPS which means the whole throttle body if I'm not mistaken. Before I throw money at it (I think throttle body is ~$130-200+) I wanted to see if anyone else had solved this problem?
2011 9c1

"It's got a cop motor, a 364-cubic-inch plant. It's got cop tires, cop suspension, cop shocks..."

thirdgenfarmer
Posts: 64
Joined: Sat Apr 29, 2017 4:47 pm

Re: P2135 and Reduced Engine Power

Post by thirdgenfarmer » Thu Mar 22, 2018 3:44 pm

Happened two more times - back to back yesterday. Disconnected battery for 30 seconds or so, cleared code and was able to make it home.

Gave the throttle body a good cleaning, on the off chance that there was enough carbon build up to be effecting the deflection/reading of the sensor.

Will keep updating - if it happens again I will likely replace the TB.
2011 9c1

"It's got a cop motor, a 364-cubic-inch plant. It's got cop tires, cop suspension, cop shocks..."

thirdgenfarmer
Posts: 64
Joined: Sat Apr 29, 2017 4:47 pm

Re: P2135 and Reduced Engine Power

Post by thirdgenfarmer » Fri Jul 27, 2018 4:54 am

Just wanted to post a short update, have not had another issue. Will continue to monitor.
2011 9c1

"It's got a cop motor, a 364-cubic-inch plant. It's got cop tires, cop suspension, cop shocks..."

9C1fanatic
Posts: 428
Joined: Wed Dec 31, 2014 2:58 am
Location: Texas Hill Country

Re: P2135 and Reduced Engine Power

Post by 9C1fanatic » Mon Jul 30, 2018 7:18 pm

Any updated information on this? How many miles were on your car. One of our agencies' 2015 Caprices is doing this exact thing. Been to the shop three times with no success.
Garner Ames



1975 Pontiac Grand Am L77 - 14.82 @ 92.89
1991 Chevrolet C1500 L31 Vortec/5 Speed
2014 Chevrolet Caprice 9C1 L77 - 13.60 @ 105.87
SS Roto-Fab CAI, Solo axle backs

2015 Chevrolet Caprice 9C1 6.0L (owned by the tax payer in all of us)

Solo axle backs

lastcall190
Posts: 567
Joined: Mon Sep 11, 2017 10:17 am
Location: North Jersey

Re: P2135 and Reduced Engine Power

Post by lastcall190 » Tue Jul 31, 2018 1:26 am

https://www.g8board.com/forums/5-v8-eng ... -code.html" onclick="window.open(this.href);return false;

Maybe something to go on?

-J
2012 Caprice
2008 CVPI

Both gone but not forgotten...

AKB360
Posts: 16
Joined: Mon Jul 24, 2017 8:21 pm

Re: P2135 and Reduced Engine Power

Post by AKB360 » Thu Aug 02, 2018 4:31 am

Had an issue similar to this 2 times, lost communication with multiple modules, put the car in reduced power mode, it said service stabliltrak, power steering, 2014 PPV

thirdgenfarmer
Posts: 64
Joined: Sat Apr 29, 2017 4:47 pm

Re: P2135 and Reduced Engine Power

Post by thirdgenfarmer » Wed Jun 26, 2019 4:41 pm

Update - I have not had the same trouble code appear in some time (likely since my last update). However, when under heavy acceleration (say holding the throttle to ~100% for multiple seconds) the car will give a blinking check engine light and stabilitrak is disabled temporarily. Letting off the throttle and the CEL disappears and I am able to continue driving without issue. No code is stored or able to be retrieved - i will attempt to repeat the process with my code reader on the car - but that's a bit hard given it seems i need to be @ 100% throttle for this to occur.

Anyone have any experience with this? Again leaning towards a t/b replacement due to what i have read regarding certain GM trucks - just wish i had more to go on.
2011 9c1

"It's got a cop motor, a 364-cubic-inch plant. It's got cop tires, cop suspension, cop shocks..."

s/c'd cav
Posts: 971
Joined: Mon May 30, 2016 8:12 am
Location: PHOENIX AZ

Re: P2135 and Reduced Engine Power

Post by s/c'd cav » Wed Jun 26, 2019 5:32 pm

FLASHING CEL is a engine missfire

nsaturday
Posts: 2
Joined: Thu May 16, 2019 9:05 am

Re: P2135 and Reduced Engine Power

Post by nsaturday » Thu Jun 27, 2019 8:54 am

s/c'd cav wrote:
Wed Jun 26, 2019 5:32 pm
FLASHING CEL is a engine missfire
Agreed.

Sounds like you have two issues, the stumble and rough idle, plus the blinking CEL under full throttle is a misfire issue.

The correlation code sounds like a TB issue.



All his videos are very informative.

rcodea1
Posts: 21
Joined: Fri Jun 07, 2019 5:58 pm

Re: P2135 and Reduced Engine Power

Post by rcodea1 » Wed Feb 19, 2020 7:24 pm

I am getting something similar but have not been able to figure out the source. in logs i can see there is a large difference between TPS1 and TPS2, but wires, TB and tune all seem to be agreeing.

Can someone with a '14-16 PPV log or see the following data....this may help myself and others.

Acc Pedal Position 1
Acc Pedal Position 2
TPS1 %
TPS1 Volts
TPS2 %
TPS2 Volts

My data is all found on this thread:
http://newcaprice.com/forum/viewtopic.p ... 2c34ee6ea5
~Ryan
Charleston, SC

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