2001 Grand Am The TRAC OFF, ABS and check engine soon light are on. Checked with computer and code reads "misfire on # 3. Doesn't make sense.

Asked by Feb 25, 2017 at 06:38 AM about the Pontiac Grand Am

Question type: Maintenance & Repair

1 Answer

89,095

The scanner you used must not be capable of reading ABS codes. Need to find someone with a scanner that can do this for the ABS codes. The Service Engine Soon light is on because of the po303 code, a engine code which is different than ABS codes.....P0303 PONTIAC - Cylinder 3 Misfire Detected...Possible causes; Faulty spark plug 3, Clogged or faulty fuel injector 3, Faulty ignition coil 3, Fuel injector 3 harness is open or shorted, Fuel injector 3 circuit poor electrical connection, Ignition coil 3 harness is open or shorted, Ignition coil 3 circuit poor electrical connection, Insufficient cylinder 3 compression, Incorrect fuel pressure, Intake air leak...The P0303 code means that the cylinder 3 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 3. If the problem persist more tests needs to be done to diagnose problem.

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