Question about 1992 GMC Yukon

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No start code 43 and 54

Fuel pump not coming on and no spark

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Code 43 knock sensor signal
54 Fuel pump circuit - voltage low Wiring open circuit/short circuit to ground, fuel pump relay, fuel pump, engine oil pressure warning lamp switch, ECM hope it helps

Posted on Apr 07, 2014

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Posted on Jan 02, 2017

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