03 with po477 po201 po202 po203 codes

[HullD]

I have a stock 03 305 ho truck with 107000 on the clock.

I was driveing down the road when the check engine light came on and it started missing.

I was able to limp on home and pluged in my scanner.

It is throwing po477 po201 po202 po203 codes.

Anyone have any ideas?

 

[p-Bar]

P0201 Fuel Injector 1 Circuit
P0202 Fuel Injector 2 Circuit
P0203 Fuel Injector 3 Circuit
P0477 Exhaust pressure control relay low

 

[HullD]

I have the code designations but was wondering if there is a comon problem that causes these codes ?

 

[E7mack96]

had that happen on an ISL, ended up needing a new ECM.

 

[cerberusiam]

Injector harness connection at the ECU or vlave cover both are a known problem area. There is a TSB for sealing the ECU plug and stopping corrosion on it and the VC gasket is just a replacement. Check all the harness connections also to make sure they are clean and tight.