This bulletin applies to 2011-2013 Buick Regal and 2013-2016 Verano vehicles, equipped with a 2.0L engine. In addition to possibly having a DTC P0336 set, the vehicle may exhibit any or all of the following: tachometer inoperative or erratic, engine extended crank before starting or a crank-no-start condition.
The cause may be a damaged crankshaft reluctor. If normal diagnostics has not led to a resolution, try the following: If the engine has an extended crank/crank-no-start condition, disconnect the crankshaft position sensor electrical connector and determine if the engine will start normally. If now starting normally, or no preious starting conditions were present (only P0336 and/or tach inoperative), remove the crankshaft position sensor and inspect the entire crankshaft reluctor thoroughly for tooth damage. It only takes a small amount of damage to the reluctor such as a ding or small dent to cause this issue.
