I am throwing codes 41, 42 and 51. The car feels fine but i dont think i would be throwing these codes if nothing were wrong. My question is i know 41 and 42 are ignition related but i dont know what 51 is. I was hoping yal could help me diagnose my problem so i could fix it. Thanks.

PS: The opti and coil are new and have been in for about 6 months with no problems yet. Maybe my ignition module? Thanks


Chris

 

41: No Igntion control circuit
42: Ignition Control Circuit
51: PROM/EEPROM Error

Hope this helps,
Keith

 

My shop manual says the only fix for 51 is to replace the PCM. try resetting the codes and see if it returns. If it does see if you can find a PCM in a salvage yard.

Sorry to hear about your trouble. Good luck

 

what are you using on a 95 to read codes?

 

A scan tool or scanning software and cable is required.


95z28 -quicksilver:

Your situation could have just been a hiccup. I would reset the pcm, check your power and ground connections and keep an eye on it.

 

Funny Im getting codes 16,41,42,51. Im guessing its the ignition module or the ecm(probably the ecm). This has happen to me about 4 times in the last 6 months. Everytime at idle, I start to let out the clutch and it will stumble and shut off, then the car wont start, I have to let it sit for a few minutes and it cranks up again. I can clear the codes and its fine for another month or so. Also every now and then at part throttle usually from a stop the car will stumble hard as if it lost spark for a second(no trouble codes on this one). Any ideas?

 

New development. Cleared codes, drove fine for a couple of days with no problems. Got n 2 races today, a 98SS and a turbo stealth and beat both of them so the car was running fine. Then when i got in to start it a couple of minutes ago, IT WONT START!!! It is throwing code 16. Thats it. What would make it not start like this? I did a search i heard that it is probably the ignition module. I guess i will replace that. Any other ideas? Thanks.


Chris

 

I've been having the same problems.....let me know what works and how to figure out what it is.

 

Code 16 would probably be related to a bad pcm not the ignition module. By the way did it eventually start up or is it dead?

 

Car cranks but wont start. Can anybody tell me what code 16 is? Thanks.



Chris

 

Optispark-no low resolution pulse. Check the opti harness connections before assuming the worst.

 

By opti harness connectors do you mean where the plug wires go into the opti? And is there ANY way the low resolution could be du to the ignition module being faulty?



Chris

 

I think i will just check the opti connections and replace the ignition module. If that does not work i dont know what else to do. How can you check for a faulty PCM? Is there any way?


Chris

 

Yes, check for corrosion on the plug to the opti, itself and the other end of that harness is up by the EVAP solenoid.

DTC 16 is only caused by the opti or it's connection. The ICM would not be the cause of that code.

 

Shoebox,
Say the ecm is the culprit, wouldnt it be possible to still throw code 16? Example: ecm powers the opti, opti gets no power, ecm therefore does not detect low resolution pulse.
I am still leaning torwards the ecm being bad. I changed my opti recently and checked the opti cable(power,resistance...), it was fine. Thought I would wait for it to totally die before i started sinking any more money into my ride.