Code 41 = new ECM? - ZR-1 Net Registry Forums

Weeberone · 04-30-2019

Ok. Washed the car the other day and when I started it after it was idling really high about 2000 rpm and didn't have any power. The fan comes on right when I turn the key even before the engine is started. The ccm code on the Speedo says 41 both current and stored, even after clearing. I can got no ECM codes (by grounding A and B) the light in the DIC doesn't even light up. Code 41 means a loss of communication between the ECM and the CCM

My question is will the car still run fine with a good ECM and a bad link between the CCM or is my ECM fubar?

XfireZ51 · 04-30-2019

Quote:

Originally Posted by Weeberone

Ok. Washed the car the other day and when I started it after it was idling really high about 2000 rpm and didn't have any power. The fan comes on right when I turn the key even before the engine is started. The ccm code on the Speedo says 41 both current and stored, even after clearing. I can got no ECM codes (by grounding A and B) the light in the DIC doesn't even light up. Code 41 means a loss of communication between the ECM and the CCM

My question is will the car still run fine with a good ECM and a bad link between the CCM or is my ECM fubar?

Fans coming on and crap running suggest ur in default or limp home mode.
I would pull BATT neg. then see about re-seating the prom in the ECM.

Weeberone · 04-30-2019

Battery reconnect did nothing. I'll try the prom next

G8nightman · 04-30-2019

Sounds like you wet something.

Weeberone · 04-30-2019

Yeah, my pants when I thought of what it'll cost to replace, let alone even finding one!

G8nightman · 04-30-2019

Ecm are not cheap that is if you can even find one.

Sent from my iPhone using ZR-1 Net Registry

Ccmano · 04-30-2019

Worst case Haibeck can have it rebuilt. I seriously doubt that’s the issue though. Did you wash the engine? In this case its more likely a connector somewhere.
H

-=Jeff=- · 04-30-2019

reseat the connectors on the ECM, there was someone here who had that issue with bad pin connection to the ECM..

XfireZ51 · 04-30-2019

Quote:

Originally Posted by -=Jeff=-

reseat the connectors on the ECM, there was someone here who had that issue with bad pin connection to the ECM..

Sometimes its just a matter of a bit of corrosion that needs some removal.

Weeberone · 04-30-2019

Ok. So after sitting over night and reseating the PROM and 4 connectors to the ECM, it seems to be talking with the CCM again. No more CCM code 41 and "Err" at number 4.

The fan stays off with the engine off now, but when starting there is still a high idle and now the check engine light comes on, which it wasn't doing before. The CCM gives a c12 code, but the ECM gives a code 14 "coolant sensor high temp" and a 41 "cylinder select error"

When I erase these codes and start the car it sounds fine for about a couple seconds the the check engine light comes on and the idle increases and it shows the same 2 codes.

Any suggestions?

04-30-2019	#1
Weeberone Join Date: May 2018 Location: Nanaimo BC Posts: 61	Code 41 = new ECM? Ok. Washed the car the other day and when I started it after it was idling really high about 2000 rpm and didn't have any power. The fan comes on right when I turn the key even before the engine is started. The ccm code on the Speedo says 41 both current and stored, even after clearing. I can got no ECM codes (by grounding A and B) the light in the DIC doesn't even light up. Code 41 means a loss of communication between the ECM and the CCM My question is will the car still run fine with a good ECM and a bad link between the CCM or is my ECM fubar?

04-30-2019	#3
Weeberone Join Date: May 2018 Location: Nanaimo BC Posts: 61	Re: Code 41 = new ECM? Battery reconnect did nothing. I'll try the prom next

04-30-2019	#4
G8nightman Join Date: Dec 2007 Location: NYC Posts: 1,191	Re: Code 41 = new ECM? Sounds like you wet something. __________________ 90 Chevy ZR1 LPE #2315 'SOLD' 90 Chevy ZR1 LPE #2774 'SOLD' 91 Chevy ZR1 Callaway aerobody 91 Chevy ZR1 #1512 91 Chevy ZR1 #951 95 Chevy ZR1 #338 'SOLD' 91 BMW 850i 94 BMW 850csi 95 BMW 850csi 94 Lotus Esprit S4 07 Benz CLS550 06 BMW M5 "SOLD"

04-30-2019	#5
Weeberone Join Date: May 2018 Location: Nanaimo BC Posts: 61	Re: Code 41 = new ECM? Yeah, my pants when I thought of what it'll cost to replace, let alone even finding one!

04-30-2019	#6
G8nightman Join Date: Dec 2007 Location: NYC Posts: 1,191	Re: Code 41 = new ECM? Ecm are not cheap that is if you can even find one. Sent from my iPhone using ZR-1 Net Registry __________________ 90 Chevy ZR1 LPE #2315 'SOLD' 90 Chevy ZR1 LPE #2774 'SOLD' 91 Chevy ZR1 Callaway aerobody 91 Chevy ZR1 #1512 91 Chevy ZR1 #951 95 Chevy ZR1 #338 'SOLD' 91 BMW 850i 94 BMW 850csi 95 BMW 850csi 94 Lotus Esprit S4 07 Benz CLS550 06 BMW M5 "SOLD"

04-30-2019	#7
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	Re: Code 41 = new ECM? Worst case Haibeck can have it rebuilt. I seriously doubt that’s the issue though. Did you wash the engine? In this case its more likely a connector somewhere. H __________________ 90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. Last edited by Ccmano; 04-30-2019 at 12:07 PM.

04-30-2019	#8
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,173	Re: Code 41 = new ECM? reseat the connectors on the ECM, there was someone here who had that issue with bad pin connection to the ECM.. __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978

04-30-2019	#10
Weeberone Join Date: May 2018 Location: Nanaimo BC Posts: 61	Re: Code 41 = new ECM? Ok. So after sitting over night and reseating the PROM and 4 connectors to the ECM, it seems to be talking with the CCM again. No more CCM code 41 and "Err" at number 4. The fan stays off with the engine off now, but when starting there is still a high idle and now the check engine light comes on, which it wasn't doing before. The CCM gives a c12 code, but the ECM gives a code 14 "coolant sensor high temp" and a 41 "cylinder select error" When I erase these codes and start the car it sounds fine for about a couple seconds the the check engine light comes on and the idle increases and it shows the same 2 codes. Any suggestions?