03 GMC Envoy 4.2 no start. No signal @ coils, Is this a PCM problem?

Asked by Sep 29, 2017 at 10:41 AM about the 2003 GMC Envoy XL SLT 4WD

Question type: Maintenance & Repair

8 Answers

3,880

Have you tested crankshaft and camshaft sensors? Any check engine light?

118,415

Maybe, but like mentioned above I'd be looking at sensor problems first, if you don't have a scanner, either buy a good one, make sure it has live data and freeze frame capabilities. Or if your in the right area some parts store will rent one out.

Yes, both crank & cam sensors are providing feedback.

No codes.

118,415

They are not suppose to show feedback, you should see a good clean signal pulse on both of the sensors, if it is showing any "feedback" or "static" check the wiring for chafing then if that is good replace the sensors.

sorry, wrong word, pulse is what I should have said.

118,415

Ok so next check to see if the ECM is sending out a signal on the spout wire at the ECM for each coil, if no signal the you have an ECM problem, if you have an spout signal then you have a wiring issue.

1 people found this helpful.

no signal at ECM, must be ECM. Checked continuity, all spout wires ck out.

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