Code P0401
August 28th, 2018, 10:24 PM
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Code P0401
Hi everybody, new here to the forum.
Hoping somebody can help me out with this.
1997 Chevy K1500 Z71, 5.7 litre. I keep getting this P0401 code that is "insufficient EGR flow." I have replaced the egr valve and cleaned all the egr passages. I have verified they are clear and I have verified that the valve is not stuck open or closed. I do not know how to check the pins on the wire harness to make sure that the power input to the valve is correct. I have tools, but I don't know what pin is what on the harness. I don't know what else to check, seems like it should be fine, but the code keeps popping back up. The truck does have an old battery and I use a battery tender on it. Starts, runs and drives fine, but I don't know if this could be messing with the computer???
Any advice is greatly appreciated,
Thanks,
Clay
Hoping somebody can help me out with this.
1997 Chevy K1500 Z71, 5.7 litre. I keep getting this P0401 code that is "insufficient EGR flow." I have replaced the egr valve and cleaned all the egr passages. I have verified they are clear and I have verified that the valve is not stuck open or closed. I do not know how to check the pins on the wire harness to make sure that the power input to the valve is correct. I have tools, but I don't know what pin is what on the harness. I don't know what else to check, seems like it should be fine, but the code keeps popping back up. The truck does have an old battery and I use a battery tender on it. Starts, runs and drives fine, but I don't know if this could be messing with the computer???
Any advice is greatly appreciated,
Thanks,
Clay
August 30th, 2018, 8:16 PM
#2
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That code is tied to map sensor also,meaning there is a conflict between the two, harness look ok?clean connections?and it's not messing with ecm,just alerting you of a error
August 31st, 2018, 3:54 PM
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found it, everything looks good, it tests out good. All the components here are good. I don't know if the PCM is sending the signal, and the truck has to be going down the road...