Question about 2008 Cadillac Cts

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2008 Cadillac CTS returning P0303 after replacing spark plug and coil pack

Was getting codes P0300, P0303, P0304, P0305. Changed all spark plugs and coil packs on 3,4,5. Still returned P0303 so I tested by switching out coil pack to 1 and spark plug to 5. It returned a P0305 so I changed the sparked plug again. It cleared the problem until driving about 25 miles and then got P0303 again. At a loss, what now?

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P0303 code occurs when there is no spark or the spark voltage was too weak to ignite the fuel due to a failed wire or plug.. P0303 (Cyl. 3 misfire) only indicates no spark or a weak spark. There are other codes for other conditions and systems.

Posted on Apr 01, 2015

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Error Code: P0303
Description:
Cylinder 3 - Misfire Detected
Possible Cause:
Wiring harness, igniter and fuel injector connectors.
Ignition system. (Spark plugs gaps)
Fuel injector No. 3.
Fuel pressure.
Running out of fuel.
EVAP canister purge valve.
Evaporative emission system.
Low compression, cylinder No.3. (check valve clearance and throttle plate for excessive wear)
Engine control module (ECM).

Posted on Feb 27, 2014

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P0303................3........
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I would check your spark plugs first if Ok you need to make sure the coils are working ok for this you need an osciloscope to check output voltage if your not sure then take to a qualified mechanic with Cadilac experience it could be caused by an air leak,bad ECT sensor or even Mass air flow sensor ,codes only tell you the result not the cause

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