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Discussion Starter · #1 · (Edited)
If your XC60 engine stutters and you find these random misfire codes, check the gas cap. I feel a bit foolish after a trip out of town yesterday. Car started running rough with CEL message to "Slow down or shift up". Drove it home worried. Spent an hour this morning checking the plugs and ignition coils. They looked fine, but I decided to replace them all at only 40K. Did more research and fearing the worst I bought a can of fuel treatment before taking it to the mechanic tomorrow. Before pouring it in, I saw I had cross threaded the fuel cap the last time and not tightened it all the way. Stupid fix and no more codes.

For some reason, I still assume there should be a message about the fuel cap or fuel pressure. "Slow down or shift up" threw me way off. Maybe this will save someone from a big repair bill.
 
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