C5 reduced engine mode
Thread Starter
Intermediate
Joined: Aug 2025
Posts: 32
Likes: 2
From: Orange County
C5 reduced engine mode
Hey guys so I have this problem of whenever I drive my 2002 C5 vette it Dosent go over 2k rpm and whenever I try to get on it and hit the gas it throws it into reduced engine mode/Service traction control system , I just want your guy’s opinion on what it could be because I had a couple of guys check it out and they can’t really figure it out because the codes aren’t straight forward or at least they don’t look like it , these are the codes I’m getting , I already tried clearing them because they are history codes but they keep coming back also another detail that may help is one time the windows didn’t wanna go up after driving which leads me to believe that it could be something electrical or a ground wire , this is just assumptions tho I’m not a mechanic so I’m just guessing at this point
P1125 H
P1280 H
P1281 H
C1278 H
B0367 H
P1626 H
U1301 H
C1278 H
U1016 H
U1255 H
U1016 H
U1096 H
U1301 H
U1255 H
U1064 H
U1040 H
U1088 H
U1176 H
U1096 H
U1160 H C
B0367 H
U1016 H
U1096 H
U1300 H
U1255 H
U1016 H
U1064 H
U1016 H
P1280 C
P1281 C
PO154 C
PO134 C
P1125 H
P1280 H
P1281 H
C1278 H
B0367 H
P1626 H
U1301 H
C1278 H
U1016 H
U1255 H
U1016 H
U1096 H
U1301 H
U1255 H
U1064 H
U1040 H
U1088 H
U1176 H
U1096 H
U1160 H C
B0367 H
U1016 H
U1096 H
U1300 H
U1255 H
U1016 H
U1064 H
U1016 H
P1280 C
P1281 C
PO154 C
PO134 C
Melting Slicks
Joined: Sep 2021
Posts: 2,555
Likes: 1,213
I would check the wiring harness that runs through the accordion to the module in the driver's door. If you lose power or ground to that module it throws all kinds of codes and most of your gauges quit working.
Thread Starter
Intermediate
Joined: Aug 2025
Posts: 32
Likes: 2
From: Orange County
