Question about Chevrolet Cars & Trucks
Pmd has been replaced and this just happened again for the second time in a week and alt locked and vacuum pump had issue code P0260
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Posted on Jan 02, 2017
From what I can gather, the engine cuts out and then the check engine light comes on, not the other way around, check engine light and then cut out?
If you switch on the ignition but do not start the engine, you will see that the check engine light is on. It won't go out until you start the engine.
When the engine cuts out, it is just as though you have switched on the ignition without starting the engine, the key is in the exact same position, and therefor the check engine light comes on purely and simply because the engine isn't running, not because it has sensed a problem, hence you have no fault codes, its perfectly normal.
If, however, the light comes on then the engine cuts out, then the reason for the lack of codes could be a short term electrical failure. If the power to the ECM were briefly cut then the codes would be erased immediately, but this would have to be a complete failure because there is a KAM (Keep Alive Memory) wire, which supplies permanent power to the ECM if I'm not mistaken. A good candidate for a complete failure is a bad main ground cable (loose or broken).
Wiring problems a just the worst ever to trace.
Just a thought to hopefully point you in the right direction.
Very best regards
Posted on Jun 10, 2008
SOURCE: code po370 po238
put a mechanical fuel gauge and long fuel hose on the bleed valve on water crossover run it in the cab and opserve pressure, should be 3 psi at idle and min 1 psi wide open trottle. on steady run fuel pressure should stay steady too,about 3-4 psi, if it fluctuates from o psi to whatever, it could be interupted power to the LP. failing OPS ??
Try above first.
what are the codes for??
Posted on Jul 12, 2008
SOURCE: 20 amp ECM B fuse
check again the fuel pump. check the resistance if too low. or unplug the pump and put a fuse again, if the fuse will not blow, then the pump went bad again.
tnx 4 using fixya,
Posted on Oct 27, 2008
SOURCE: ecm fuse keeps blowing
just fixed this problem, change your fuel pump module, fuel sending unit shorts out on fuel level swing arm blue wire... unfortinately you must replace it as unit because of the design, fuel pump and tank guage fuel level sending unit are a one peice item, fuel tank has to come out to change unit, about a $ 700.00 repair too... fuel pump module runs about 350 to 700 $ depending on aftermarket or factory, try to find one with a lifetime warranty even if it is $ 50.00 more worth it..labor is about $ 250 to $ 400 depending on shop labor rate... definate problem though I ahve no doubt, common problem on GM... please rate my help, thanks...
Posted on Aug 06, 2009
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