Code 43 - ESC (electronic spark control) - ZR-1 Net Registry Forums

VetteMed · 03-09-2012

Got a check engine light today, code 43. Happened right after startup, when the motor was already fully warmed up.

Haven't done any troubleshooting yet, but the next time I started the motor, the code was not active. Seems to be running fine (though I took it very easy when the CEL was illuminated, due to the secondary port throttles being eliminated).

I did install an aftermarket knock sensor when I replaced the motor. Wondering if the ECM is not liking it...

Any thoughts?

Edit:
I found the diagnostic chart in the FSM, so I'll follow that tomorrow and see if I can narrow down the issue at all. I fear it may all check out normal, given that the CEL is not currently illuminated, so it may end up being a case where I buy a different knock sensor anyway...

03-09-2012	#1
VetteMed Join Date: Mar 2009 Location: Orlando, FL Posts: 1,828	Code 43 - ESC (electronic spark control) Got a check engine light today, code 43. Happened right after startup, when the motor was already fully warmed up. Haven't done any troubleshooting yet, but the next time I started the motor, the code was not active. Seems to be running fine (though I took it very easy when the CEL was illuminated, due to the secondary port throttles being eliminated). I did install an aftermarket knock sensor when I replaced the motor. Wondering if the ECM is not liking it... Any thoughts? Edit: I found the diagnostic chart in the FSM, so I'll follow that tomorrow and see if I can narrow down the issue at all. I fear it may all check out normal, given that the CEL is not currently illuminated, so it may end up being a case where I buy a different knock sensor anyway... __________________ 2004 Z06/Z16 LeMans Commemorative Edition 1991 ZR-1 #302 White/Gray (sold) 1991 ZR-1 #1147 Red/Saddle (sold) Last edited by VetteMed; 03-09-2012 at 10:05 PM.