2024 Silverado RST 6.2l v8 missfire

[Silverado8810]

Just purchased a 2024 Silverado RST with the 6.2l v8, 17k miles. A few days ago I noticed a stutter while driving, lasted about 10-15 seconds then disappeared. Next day it did the same thing again. Later that night the stutter returned much worse, definitely a missfire, then check engine light started flashing and service stability system light came on. Attempted to pull over and before I could come to a stop the lights went off and the missfire disappeared. Drove it home about 20 miles and it ran fine the whole way. Hooked my reader up and it showed 34 active codes the first being p2255 O2 sensor negative current. Next two codes read manufacturer specific blah blah blah, scrolled to the fourth code and all codes dissapeared from the reader. Re-scanned and no codes (active, stored, or pending). Tried another scan tool and that also read no codes. Driven it the last 2 days to work and back with no issues. Today I had a coworker try his 2 code readers for a sanity check and they also show 0 codes. Being intermittent definitely seems like an electronic issue to me but outside that I’m lost. I talked to the dealership and have an appointment scheduled for next week but without codes I don’t have much faith that they will be able to locate the issue. Any insight is appreciated.

Edited April 23, 2025 by Silverado8810

[Bikerjon]

1 hour ago, Silverado8810 said:

Just purchased a 2024 Silverado RST with the 6.2l v8, 17k miles. A few days ago I noticed a stutter while driving, lasted about 10-15 seconds then disappeared. Next day it did the same thing again. Later that night the stutter returned much worse, definitely a missfire, then check engine light started flashing and service stability system light came on. Attempted to pull over and before I could come to a stop the lights went off and the missfire disappeared. Drove it home about 20 miles and it ran fine the whole way. Hooked my reader up and it showed 34 active codes the first being p2255 O2 sensor negative current. Next two codes read manufacturer specific blah blah blah, scrolled to the fourth code and all codes dissapeared from the reader. Re-scanned and no codes (active, stored, or pending). Tried another scan tool and that also read no codes. Driven it the last 2 days to work and back with no issues. Today I had a coworker try his 2 code readers for a sanity check and they also show 0 codes. Being intermittent definitely seems like an electronic issue to me but outside that I’m lost. I talked to the dealership and have an appointment scheduled for next week but without codes I don’t have much faith that they will be able to locate the issue. Any insight is appreciated.

Just a guess. Check the ground strap in the engine compartment. Its on the passenger side. It connects the firewall to the frame. Lots of issues have been caused by a poor connection there.

[GMCustomerService]

3 hours ago, Silverado8810 said:

Just purchased a 2024 Silverado RST with the 6.2l v8, 17k miles. A few days ago I noticed a stutter while driving, lasted about 10-15 seconds then disappeared. Next day it did the same thing again. Later that night the stutter returned much worse, definitely a missfire, then check engine light started flashing and service stability system light came on. Attempted to pull over and before I could come to a stop the lights went off and the missfire disappeared. Drove it home about 20 miles and it ran fine the whole way. Hooked my reader up and it showed 34 active codes the first being p2255 O2 sensor negative current. Next two codes read manufacturer specific blah blah blah, scrolled to the fourth code and all codes dissapeared from the reader. Re-scanned and no codes (active, stored, or pending). Tried another scan tool and that also read no codes. Driven it the last 2 days to work and back with no issues. Today I had a coworker try his 2 code readers for a sanity check and they also show 0 codes. Being intermittent definitely seems like an electronic issue to me but outside that I’m lost. I talked to the dealership and have an appointment scheduled for next week but without codes I don’t have much faith that they will be able to locate the issue. Any insight is appreciated.

We understand this is far from the ownership experience you would hope for. We are relieved to hear you are working with your GM dealership to address this stutter, though our team would like the opportunity to act as an extra layer of assistance. When you have a moment, please send us an email at [email protected] so we can help. By sending us a message, you consent to the information you provide being monitored and recorded by GM or those acting on GM’s behalf, subject to the GM Privacy Statement: https://www.gm.com/privacy-statement.

[Silverado8810]

1 hour ago, Bikerjon said:

Just a guess. Check the ground strap in the engine compartment. Its on the passenger side. It connects the firewall to the frame. Lots of issues have been caused by a poor connection there.

I will check on this tomorrow. Thanks for the insight

[Silverado8810]

On 4/23/2025 at 8:02 PM, GMCustomerService said:

We understand this is far from the ownership experience you would hope for. We are relieved to hear you are working with your GM dealership to address this stutter, though our team would like the opportunity to act as an extra layer of assistance. When you have a moment, please send us an email at [email protected] so we can help. By sending us a message, you consent to the information you provide being monitored and recorded by GM or those acting on GM’s behalf, subject to the GM Privacy Statement: https://www.gm.com/privacy-statement.

No response

[GMCustomerService]

On 4/25/2025 at 11:38 PM, Silverado8810 said:

No response

We apologize that we have not yet replied. In your email, please include "GM FORUM/Silverado8810" in the subject line so we can locate it ASAP.

[Silverado8810]

Update: Had the service with the dealership and as I feared, they couldn’t find anything wrong or replicate the problem. They did find a P02F5 code which is a fault in the fuel system and a P0300 misfire code but those were not currently active and just in the history so they said they could do nothing unless the CEL returned. Also, with the new recall on the 6.2, they could not address that either as it is still showing pending.