Codes P0405, P1516, and P2101, knock in top end?

2007 CHEVROLET EQUINOX
140,000 MILES • 3.4L • 6 CYL • AUTOMATIC
Avatar
ED&DESI
  • MEMBER
  • 3 POSTS
We replaced the rocker arms and lifters changed oil and filter it still has knock in the top end but drives fine. The codes that come up are P0405 P1516 and P2101, what else could be the problem?
Aug 10, 2023 at 10:48 AM
Advertisement
Avatar
STRAILER
  • ✓Experienced Mechanic
  • 55,594 POSTS
It sounds like you may have carbon on top of a piston which is common, if you upload a short video of the noise I can tell for sure. Please go over this guide

https://www.2carpros.com/articles/understanding-and-repairing-engine-knocking-noise-an-in-depth-guide


P0405 - Exhaust Gas Recirculation (EGR) Sensor A Circuit Low:

P1516 - Throttle Actuator Control (TAC) Module Throttle Actuator Position

P2101 - Throttle Actuator Control Motor Circuit Range/Performance:

None of these codes will create an engine knocking sound. Please upload pictures or videos of the problem so we can see what's going on.
Aug 11, 2023 at 4:43 AM
Avatar
ED&DESI
  • MEMBER
  • 3 POSTS
That is with the back value cover off.
Video (Click to enlarge)
Attached Media
Aug 11, 2023 at 7:39 AM
Avatar
STRAILER
  • ✓Experienced Mechanic
  • 55,594 POSTS
It looks like the spark plug wires could have been installed incorrectly. Can we please double check it?

Firing Order .................... 1 - 2 - 3 - 4 - 5 - 6

Check out the images (below). Please let us know what happens.
Images (Click to enlarge)
Attached Media
Attached Media
Attached Media
Attached Media
Attached Media
Aug 12, 2023 at 2:16 AM
Avatar
ED&DESI
  • MEMBER
  • 3 POSTS
They are In the right place.
Aug 12, 2023 at 5:33 AM
Avatar
STRAILER
  • ✓Experienced Mechanic
  • 55,594 POSTS
You might have a head gasket blown between two cylinders, let's do a compression test to see what's going on.

https://www.2carpros.com/articles/how-to-test-engine-compression

Please go over this guide and get back to us.
Aug 14, 2023 at 3:53 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle