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Discussion Starter · #1 ·
Recently replaced the engine (4.2L) with a used engine. Original engine had 215,000 miles on it and was siezed up during a test drive when it was for sale. Used engine was complete and only had 60,000 miles. Engine now runs great but keeps throwing a P1221 code. Took to dealer and they said it needed a coolant fan clutch and computer (ECM). replaced both and reprogramed. Still setting same code and reduced engine power and SES light on. Please help!!!
 

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P1221 has to do with the fuel pump circuit. My lights came on today and then went off. I'll consider it a fluke until I find out otherwise.

If you find anything out, be sure to post the result.
 
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