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EO12 Code No Distributor Signal


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The other day my 1992 Seville just died out on me as I was waiting at a stop light. My daughter's and I pushed it into a nearby parking lot where I tried to restart it to no avail. It sounded like it wanted to turn over but only kept cranking. My husband had it hauled to our house where we ran the on-board diagnostic. Code EO12 came up, which is "no distributor signal".

The question we have is, does this mean the whole distributor needs to be replaced, or just a part of it, and how can we tell what would need to be replaced? The car started a couple of times, but died out shortly after. It did, however, give my husband a chance to hear that the distributor is making a whining noise...if that helps anyone give us a tip on what needs replacing!

As always...thanks much!

April

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The other day my 1992 Seville just died out on me as I was waiting at a stop light. My daughter's and I pushed it into a nearby parking lot where I tried to restart it to no avail. It sounded like it wanted to turn over but only kept cranking. My husband had it hauled to our house where we ran the on-board diagnostic. Code EO12 came up, which is "no distributor signal".

The question we have is, does this mean the whole distributor needs to be replaced, or just a part of it, and how can we tell what would need to be replaced? The car started a couple of times, but died out shortly after. It did, however, give my husband a chance to hear that the distributor is making a whining noise...if that helps anyone give us a tip on what needs replacing!

As always...thanks much!

April

Despite there might be several culprits, the easiest way is pulling the ignition control module (ICM) out of the distributor. It is a $20 part. Take ICM to Advance or NAPA to let them test it. If it is defective, install new one with thermoconductive silicon grease (replacing old module is a good idea even it is good, because it will fail soon). There will be brittle connectors inside the distributor, so be careful, and if you do break some plastic parts. make sure you remove debris. The Hall effect switch could fail as well. As for whining noise... new cap and rotor? You chose! LOL

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The saddest thing in life is wasted talent

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I believe there is a cam sensor that is on the distributor also - that can go bad and case a no distributor signal. Corrosion on the cam sensor contacts can cause a no distributor signal when the cam sensor is good.

Kevin
'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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I would check the wiring and connectors before I replaced any pats.

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I believe there is a cam sensor that is on the distributor also - that can go bad and case a no distributor signal. Corrosion on the cam sensor contacts can cause a no distributor signal when the cam sensor is good.

KHE, I believe the Hall effect switch is the cam sensor.

The saddest thing in life is wasted talent

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Sorry I haven't gotten back to you guys!

Thank you for your wisdom once again! I'm glad we didn't have to change the whole distributor!

Last night my husband changed the cap, rotor and the ICM. My baby started right up!!! Then my husband reset the computer and no codes came up, so it's all good! :hatsoff:

Thanks for saving the day again (and saving us a bunch of money!)

April

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Sorry I haven't gotten back to you guys!

Thank you for your wisdom once again! I'm glad we didn't have to change the whole distributor!

Last night my husband changed the cap, rotor and the ICM. My baby started right up!!! Then my husband reset the computer and no codes came up, so it's all good! :hatsoff:

Thanks for saving the day again (and saving us a bunch of money!)

April

Glad you got it all fixed up.

:D :D

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