There are 2 owner-reported engine complaints for the 2006 Buick Rainierin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
AT HIGHWAY SPEEDS (50-60 MPH) ACCELERATOR BECAME INOPERATIVE...I.E., NO CONNECTION WITH ENGINE. USED "RESUME" BUTTON ON CRUISE CONTROL TO SPEED UP. MANY MONTHS AGO SAME THING HAPPENED. COULD BE VERY DANGEROUS. JUST INTERMITTENT. *NM
DT*: THE CONTACT STATED SINCE JULY 13, 2006, THE VEHICLE STALLED WITHOUT WARNING AT SPEEDS BELOW 20 MPH. THE VEHICLE RESTARTED EACH TIME AND WAS TAKEN TO THE DEALERSHIP. THE DEALERSHIP WAS UNABLE TO DETERMINE A PROBLEM, BUT REPLACED THE IGNITION SWITCH AND COOLANT TEMPERATURE SENSOR IN A REPAIR ATTEMPT. THE PROBLEM PERSISTED.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 25, 2026