Hello All,

This week the MIL light on my Suburban came on. I read the following codes:

P07E5 - Unknown Powertrain DTC (SAE Controlled; Transmission)
P0003 - Fuel Volume Regulator Control Circuit Low
P0400 - EGR Flow
P0103 - Mass or Volume Air Flow Sircuit High Input
P0100 - Mass or Volume Air Flow Circuit
P01E5 - Unknown Powertrain DTC (SAE Controlled; Fuel and Air Metering)

Along with this, the Engine runs a tad rough at idle. I am looking at replacing the MAS, since I am receiving 2 DTC's for that alone.
Any suggestions on where to start? If it were a single code or 2 it would probably be easier to diagnose, but with this many, I don't really know where to start.

Please help!
TIA,
Mark

 

Check you basics,
Make sure the air filter is clean
Make sure the air snorkel is firmly connected and sealed
Check all wiring connections to those items
Check battery voltage and battery connections
Clean the MAF sensor
Add fuel additive like BG or Techron and get gas at a different station
Write down the codes and clear them and see what comes back
If any recent work was done on / in the engine bay, recheck that work.

 

Welcome to the forum. The DTCs don't necessarily tell you what part to replace. They really tell you where to start on the fault tree in the factory service manual.