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FAULT CODE P0203 FIAT - Cars & Trucks

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Have a 2005 f-150 5.4.having trouble with codes. p0053,p0203,p0303 and pO453. Where to start and can u fix one thing to cancel out 2 or more codes.


code p0053 refers to heated oxygen sensor (HOS) bank 1-circiut malfunction===causes --wiring --- HO2S
code p0203 refers to injector 3 circuit malfunction==causes---wiring--injector ---ECM
code p03030refers to cylinder 3-- misfire detected===causes--engine mechanical fault--wiring---ignition/ fuel system---injector---ECT/MAF sensor---ECM
code p0453 refers to Evaporative emissions(EVAP) pressure sensor--high input==causes---wiring short to positive--EVAP sensor---ECM
code po203 and po303 both have injector as possible fault but the others you will have to fix separately. I doubt an ECM fault as there would be more problems evident so check that one last as it big dollars.

Sep 22, 2013 | Cars & Trucks

1 Answer

Code p0203


Code 203 is for a problem with the injector for cylinder 3.
You would need to test the injector and the circuit.

Sep 01, 2013 | Cars & Trucks

1 Answer

Code p0203


P0203 - Cylinder 3 Injector Circuit Malfunction

P0203
means that the PCM detected a fault in the injector or the wiring to the injector. It monitors the injector and when the injector is activated, the PCM expects to see the voltage pulled "low" or close to zero. When the injector is switched off, the PCM expects to see a voltage that is close to battery voltage or "high". If it doesn't see the expected voltage the PCM will set this code. The PCM also monitors resitance in the circuit. If the resistance is excessively low or high it will set this code.

The symptoms for this code will likely be a misfire and a rough running engine. Poor acceleration. The MIL will also be illuminated.

The causes of a P0203 engine light code could be any of the following:
Bad injector. This is usually the cause of this code but doesn't rule out the possibility of one of the other causes
Open in the wiring to the injector
Short in the wiring to the injector
Bad PCM

Hope this helps and just keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa.
Jose.

Oct 23, 2011 | 2001 Dodge Ram 2500 Truck

1 Answer

Got Check engine light. Read code P0203. Have


Probable cause
1. Injector failed
2. Open or shorted injector circuit, or loose connector
3. Engine control module failed

let me know

Sep 23, 2009 | 2000 Hyundai Sonata

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