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I have a 2014 silverado that has the check engine light on…

Customer Question
Hi i have a...

Hi i have a 2014 silverado that has the check engine light on and the code is throttle pedal position sensor p0121 I already replaced the the pedal but light is still coming on with same code

Mechanic's Assistant: Does the light stay on, or does it blink?

Its stays on most of the time but sometimes I notice that the light is off and then after maybe 30 min driving it’ll cine back on

Mechanic's Assistant: Are you fixing your Silverado yourself? What have you tried so far?

Yes I switched the throttle pedal

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

That’ll be it thanks

Submitted: 2 months ago.Category: Car
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Answered in 7 minutes by:
5/28/2018
Auto Mechanic: Greg, Technician replied 2 months ago
Greg
Greg, Technician
Category: Car
Satisfied Customers: 7,492
Experience: 17 years Shop Owner /Technician. 27 years experience,
Verified

Hi, I'm Greg (Indy-Tech).
Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.
Rgds Greg.

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Auto Mechanic: Greg, Technician replied 2 months ago

This is a throttle body code, TPS malfunction .

Now most people go ahead and replace the throttle body and will sort out the problem but i suggest you try this first .

Disconnect the battery .

check the connection on the throttle body ,check wiring harness for damage .if looking good remove and clean the inside of the throttle body making sure the throttle flap is cleaned of all black carbon build up.

When clean reconnect and start the engine let idle for 3 minutes , then turn the ignition off for 60 seconds

start and let idle for 3 minutes again, after the 3 minutes the engine idle should be at the factory set idle speed .

If you still have the P0121 code then replace the throttle body .

For further assistance with this issue please get back to me with the reply box below .
This is not a one answer and done i will stay with you until the problem is sorted out .
Please do not forget to leave positive feedback by clicking on the 3 to 5 stars at the top of your page, i'm not employees of the site and get no credit for spending time with you unless you leave positive feedback.
Before rating 1 to 2 stars please get back to me as i'm here to help you, if i can't or you think i can't i will opt out or you can opt me out so another expert can.
I want to help you with your problem and make you a happy motorist
Rgds Greg

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