After engine swap the engine went into limp mode

JACOB WORDEN

MEMBER
2003 CHEVROLET 1500
V8
2WD
AUTOMATIC
135,000 MILES

My wife before we met had her brother change the engine in her 2003 1500HD with a 6.0. With another 6.0. After she had blew a rod on the first one. Didn’t change anything. Just the engine. About a week after the truck went into limp mode. And we don’t know why.

I was thinking because they didn’t switch the computer with the engine. But I have no idea.

I am looking on where to start. Do we have to get it reprogrammed or I just don’t know because I wasn’t around when the job was done but she been hounding me to try to get this fixed.

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,758 POSTS

Hi,

If the engine was from the same year, make, and model, the computer should be fine. Have you scanned it for diagnostic trouble codes?

If you haven't, you really should start there to see what is stored. Do that and let me know what codes are found. If you already have, just send me the codes.

Here is a quick video showing how it is done:

https://youtu.be/YV3TRZwer8k

Let me know.

Joe

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Thursday, July 1st, 2021 AT 11:44 PM

JACOB WORDEN

MEMBER
2 POSTS

Yes, and the only code I keep getting is for a throttle position sensor and replace that but still get the same code. And the dash was saying low oil pressure so we replaced that sensor on the back of the engine by the fire wall. It starts up fine. And will run. But just in a limp mode.I try to pull the codes again when I get home this afternoon.

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Friday, July 2nd, 2021 AT 3:42 AM

JACOBANDNICKOLAS