Engine light stays on after jumping ald no flashing after jumping aldl

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Put a new ECM in my blazer and other sensors that read bad, ran great for a week this morning I went to start my truck and it just cranks, no start. Jump a and b on aldl and engine light stays on and will not flash codes. What do I do now? It does start by jumping a and b on aldl. Pulled a and b jumper off with key off then it started right up and runs normal. Reconnected a and b and now reads a constant 12 no codes/normal. What do you think? Maybe a glitch in ECM or replace the new ECM?

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in Portland OR

Jun 14, 2020

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RepairPal Certified shops can diagnose and repair your 1994 Chevrolet Blazer. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

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What is your question?

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Engine light stays on after jumping ald no flashing after jumping aldl

What is your question?

Visitor

in Portland OR

Jun 14, 2020

1 Reply

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DaveJMon Jun 15, 2020

Why the new ECM? Replacing your ECM usually fixes nothing, unless there has been water intrusion or a melted connector or something like that. Put your old ECM back in -- what was the original symptom?

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Popular Answer

What are the best Chevrolet repair shops?

RepairPal Certified shops can diagnose and repair your 1994 Chevrolet Blazer. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.