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Dan, Technician
Category: Jeep
Satisfied Customers: 24416
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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Check engine light, code 304 and 2311, replaced coil,

Customer Question

check engine light, code 304 and 2311, replaced coil, checked wires no help, thinking PCM computer
JA: Does the light stay on, or does it blink?
Customer: both,
JA: What is the make/model/year of your car?
Customer: 2006 liberty sport 3.6 engine
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: will fix myself, switch spark plug and coil, also checked wires with meyer, all look ok
JA: Anything else you think the mechanic should know?
Customer: engine was running great happened all at once, also cleared trouble codes and disconnected battery to reset PCM
Submitted: 1 year ago.
Category: Jeep
Expert:  Dan replied 1 year ago.

Hello, my name is***** agree the PCM is the cause if you replaced coil/plug. Next step is to check resistance on wiring between PCM and coil, if good replace the PCM. There is also a reflash available which you may want to try first. Here is a wiring diagram to help with testing, let me know if you have more questions. Thanks.