DTC P0121 Throttle Position (TP) Sensor Performance error code - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Buick When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 06-10-2013, 12:06 AM   #1
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Dec 2010
Posts: 66
Thanked 0 Times in 0 Posts
Bretton65 is on a distinguished road
Default DTC P0121 Throttle Position (TP) Sensor Performance error code

Been driving the Buick around and the SES lit up. It was the DTC P0121 Throttle Position (TP) Sensor Performance error code. I found Danthur’* post https://www.gmforum.com/obd-ii-troub...9/#post1390955 I installed a new AC Delco one and it is amazing what a difference that made. The throttle response is now significantly faster and smoother. Thanks to Danthur for posting that fix! When the TPS is acting up it really can show a lot of different symptoms. I was getting intermittent hesitation/stumble on acceleration but until the SES lit up I really had no idea where to look.
Bretton65 is offline   Reply With Quote
Old 06-10-2013, 09:21 AM   #2
Senior Administrator








Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Horseheads, NY
Posts: 15,643
Thanked 997 Times in 774 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

Glad you found Dan'* writeup helpful!

I betcha if you had scanned for codes you probably would have found a PENDING P0121. Even though your CEL was not illuminated, the code would still be in the PCM. Each P-code has a specific rule for it. Some will trip the CEL light the first time the PCM sees an error and others will trip 3 times before the PCM will trip the light.

With today'* newer cars and complex sensors, I cannot stress enough to people to at LEAST purchase a $50 pocket scanner. It saves you trips to Autozone to have them scan etc.
Mike is offline   Reply With Quote
Old 06-11-2013, 10:31 PM   #3
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Dec 2010
Posts: 66
Thanked 0 Times in 0 Posts
Bretton65 is on a distinguished road
Default That is interesting about the codes stored in memory.

Thanks for the info. I never considered using a scanner before the ses light went on.
Bretton65 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
A Bad TPS sensor or something else (Throttle position sensor) DeathDealer General GM Chat 17 03-27-2017 10:30 PM
1997 Bonneville with error codes P0121 and P0108 Ws10drf 1992-1999 6 02-05-2009 12:25 AM
1992 SSEi TPS throttle position sensor plug question Code 22 gtpsuprchrgd03 1992-1999 2 09-09-2008 11:47 AM
More findings-FIXED!! - 93 SSE: DTC (Code) 42 & DTC 18 93RedSled-SSE 1992-1999 45 04-21-2008 03:21 PM
Changed intake gaskets, now P0121 TPS performance code ! 1997_LeSabre 1992-1999 2 01-12-2005 01:54 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 05:30 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.