What are the most common Pontiac Montana problems?
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 1999 Pontiac Montana has 5 documented issues. The most frequently reported are: Power Sliding Door Can Open While Vehicle Is Moving (NHTSA Recall), 4T65E Automatic Transmission Failure (Slipping, Shudder, Hard Shifts), 3.4L (3400) Lower Intake Manifold Gasket Coolant/Oil Leak. Of these, 4 are rated critical and should be addressed promptly.
Is the Pontiac Montana reliable?
The 1999 Pontiac Montana has 5 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 4 issues are rated critical: Power Sliding Door Can Open While Vehicle Is Moving (NHTSA Recall) and 4T65E Automatic Transmission Failure (Slipping, Shudder, Hard Shifts) and 3.4L (3400) Lower Intake Manifold Gasket Coolant/Oil Leak and Montana 3.4L V6 Intake Gasket — Same as Grand Am. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common Pontiac Montana problems?
Repair costs for known Pontiac Montana issues range from $50 to $2,800, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 1997-2001 Pontiac Montana Power Sliding Door Can Open While Vehicle Is Moving (NHTSA Recall)?
NHTSA campaigns 01V067 and 01V264 support the frozen safety identity for equipped Pontiac Montana/Trans Sport minivans within the 1997-2001 range. Campaign 01V067 covers passenger-side power sliding doors that can close without latching and then open while moving. Follow-up 01V26… Severity: high.
What is the 1999-2005 Pontiac Montana 4T65E Automatic Transmission Failure (Slipping, Shudder, Hard Shifts)?
The Montana's 4T65E 4-speed automatic is a known weak point, particularly in heat and stop-and-go driving. Common failures include slipping out of gear, a shudder when shifting, harsh or delayed shifts, and loss of certain gears as the 4th-gear clutch hubs de-spline from repeated… Repairs typically run $2,000-$2,800. Severity: high.
What is the 1999-2005 Pontiac Montana 3.4L (3400) Lower Intake Manifold Gasket Coolant/Oil Leak?
The 3.4L V6 (LA1/3400) used in the Montana is notorious for lower intake manifold gasket failure. GM's original design used a plastic (nylon) gasket carrier and silicone seals that crack and shift with heat cycling, allowing coolant and/or oil to leak. Leaks can be external (cool… Repairs typically run $760-$900. Severity: high.
What is the 1999-2005 Pontiac Montana Montana 3.4L V6 Intake Gasket — Same as Grand Am?
Same 3.4L LA1 V6 upper/lower intake gasket failure as Grand Am. The U-body minivans (Pontiac Montana, Chevy Venture, Olds Silhouette) all share the engine and the failure pattern. Often presents earlier on the minivans due to higher load duty cycles. Repairs typically run $500-$1,200. Severity: high.
What is the 1999-2005 Pontiac Montana Blower Motor / HVAC Blower Resistor Failure?
The Montana's heater/AC blower commonly fails due to a bad blower motor resistor or the blower motor itself. A classic symptom is the fan working only on the highest setting (which bypasses the resistor) while lower speeds are dead; in other cases the blower quits entirely or, le… Repairs typically run $50-$250. Severity: low.
