P1181 transmission help needed

Maintenance/Repairs
,
1

2003 Buick Lesabre 3800 V6 70K only on it. this problem Hard or long shifts it comes and goes, it seems

when the engine is hot normally on a long run it starts with the hard transmission

shifts, same as a P1181 code but no engine check light on yet , some articles say a MAP sensor could cause it

what’s next any suggestions ?.

2

Years ago the torque converter lockup on a Pontiac I owned would act up when the engine got hot enough. Something similar could be what’s happening to you. Not every fault triggers the check engine light. A good mechanic can probably figure it out by seat of the pants.