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Code 41 - EST Circuit (Electronic Spark Timing) or CMP Sensor, No distributor Reference pulses to the PCM at specified engine Vacuum, A malfunctioning ignition module can very easily cause this code to set. If the EST circuit is either open or grounded it may very well cause the same problem. Hope this helps.
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Code 12 for 1994 Chevy Astro van?
i have a code 12 on my chevy astro van what it means
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Ckp sencer
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Trouble code list for 1993 Chevy Camero?
http://chevythunder.com/199295_lt1_trouble_codes.htm
