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P0203 check engine light

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Code p0203


code p0203 refers to injector 3 circuit malfunction===causes --wiring--injector---ECM
check the wiring connections to the injector are clean and tight
I may be a circuit in the injector that is breaking down from overheating so consider replacing that injector with a new one
It may also be a tip failure ( seizing when hot) but with a new injector that problem will be eliminated

Jul 31, 2015 | Cars & Trucks

1 Answer

Po 203


P0203 - Injector Circuit Malfunction Cylinder 3
Possible causes- Fuel Injector 3 harness is open or shorted
- Fuel injector 3 circuit poor electrical connection

- Faulty fuel injector
- Faulty Engine Control Module (ECM) When is the code detected?The P0203 is set if the Engine Control Module (ECM) detects a low or high voltage drop or resistance at the number 3 engine cylinder injector.

Aug 16, 2012 | Cars & Trucks

1 Answer

P0203 fuel injector circuit malfunction - #3 hyundai tucson 2010 diesel


Hi there:
Check in THIS LINK the description about your problem, work to your engine and DTC (DIagnostic Trouble Code) find it:

I suggest to check and confirm you no problem with the wiring between the injector connector pins and the ECM (Engine Control Module) and you have good pin tension at the injector. Also test good pin tension at the ECM and good continuity between the injector and injector fuse. If in fact this is so, you have a bad ECM.


Hope this helps; also 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, have a nice day.

Jun 25, 2012 | 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

Trac off light came on and off then stayed on while driving, p0203p0204 p0300 codes when scanned with little machine better read open circuts in both injectors loss of power


P0203 - Injector Circuit Malfunction Cylinder 3

Powertrain Control Module (PCM) or Electronic Control Module (ECM) checks the injectors circuit resistance and monitors the voltage drop during normal operation. The PCM/ECM will trigger the P0203 code when the resistance or voltage drop at the injector #3 is out of specifications.

Causes:
- Open or shorted wiring harness to the injector #3
- Bad injector #3
- Bad PCM/ECM

Solutions:
- If damage, repair injector wire harness or connector
- Replace injector
- Replace PCM or ECM


P0204 - Injector Circuit Malfunction Cylinder 4

Same info as the P0203 DTC


P0300 - Random/Multiple Cylinder Misfire Detected

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the crankshaft position (CKP) sensor (POS) signal to vary, Powertrain Control Module (PCM) or Electronic Control Module (ECM) can determine that a misfire is occurring.

Causes:
- Improper spark plug
- Insufficient compression
- Incorrect fuel pressure
- The injector circuit is open or shorted
- Fuel injectors may be faulty
- Intake air leak
- The ignition signal circuit is open or shorted

Solutions:
- Perform Injector Service
- Replace Spark Plugs
- Replace Injectors
- Replace Ignition Coils

Feb 03, 2011 | 2001 Pontiac Sunfire

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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