Reduced Engine Power in My Silverado - Need Help!

Technical Issues
1

I recently started experiencing the dreaded ‘Reduced Engine Power’ message in my Chevy Silverado, and I’m at my wits’ end trying to figure out what’s going on. Here’s a bit of background on the situation:

Symptoms

  • The warning light comes on intermittently.
  • Performance drops significantly while driving.
  • It feels like the engine is struggling to get power, especially when accelerating.

What I’ve Done So Far

  • Checked for Codes: I plugged in a code reader, and the only code that popped up was P2135 - Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation.
  • Inspection: I looked at the throttle body, and while it looks clean, I’m not sure if there’s an underlying issue.
  • Replaced Air Filter: Did a routine maintenance item, and it was pretty dirty, but I don’t think it’s the root cause.

Questions

  1. Throttle Position Sensor: How do I know if the throttle position sensor is the issue? Is it something that I can test myself?
  2. Wiring Issues: Could there be wiring problems that lead to this condition? I’d rather not dive into a costly repair if it’s just a bad wire.
  3. Other Recommendations: Any other troubleshooting tips or fixes you can suggest?

Community Experiences

I’d love to hear from anyone who’s faced this problem before. What worked for you? Did you end up going to a dealership, or were you able to sort it out yourself?

Thanks in advance for your help! I really appreciate any advice you can offer as I navigate this frustrating issue.

2

If you’re experiencing reduced engine power, it could be a number of factors. Faulty sensors, particularly the mass airflow sensor, are common culprits. They can send incorrect readings to the engine control unit, impacting performance.

3

Another issue to consider could be the throttle body. A buildup of carbon or a malfunction can definitely restrict airflow, leading to power loss.

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4

I had a similar issue recently, and it turned out to be a clogged fuel filter. It’s worth checking your fuel system if the sensors and throttle body seem fine.

5

Great tip! Don’t forget that a failing fuel pump can also contribute to reduced power. If your truck is stumbling during acceleration, it could be fuel delivery-related.

6

Another thing to check is the spark plugs. Worn or fouled plugs can misfire, causing a noticeable drop in power. It’s an easy fix if that’s the issue.

7

Hopefully, it’s just sensors or plugs! I love my Silverado. Check the codes; they can help pinpoint the issue. Good luck!

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8

I had reduced power once too, and after a visit to the mechanic, it was just a loose battery cable! Sometimes the easiest fixes go overlooked.

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9

That last comment made me giggle! It’s true, though. Regular maintenance can catch these things early, so don’t skip those check-ups!

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10

What year is your Silverado? Certain models have specific recalls and known issues for reduced power. That info can help narrow down the possibilities!

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11

Good point! If it’s a late model, check for a software update. Those can affect engine performance considerably.

12

I agree with all of the above. Don’t forget about the possibility of a vacuum leak, as that can lead to performance issues as well. Make sure to inspect the hoses!

13

Honestly, it sounds like a puzzle! Each part plays a role in the engine’s performance. Try to isolate where the problem might lie based on symptoms!

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14

Absolutely! If only we could talk to our trucks, right? ‘Hey, why do you feel sluggish today?’

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15

Does anyone know how reliable those OBD2 code readers are? I’m thinking of investing in one to help diagnose these issues myself.

16

They can be quite handy! Just make sure to get one compatible with your Silverado for accurate readings.

17

I experienced reduced engine power in my Silverado too! First, you should check for any stored check engine light codes using an OBD-II scanner. It’s a great tool for pinpointing issues.

18

That’s solid advice! Also, don’t forget to check the air filter. A clogged filter can affect performance significantly.

19

You can also look into the fuel system. Sometimes a weak fuel pump or clogged fuel filter can cause reduced power. Has anyone checked those parts?

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20

Great point! I replaced my fuel filter last year, and it made a huge difference. Always good to keep that maintained.