What are the most common Buick Lucerne problems?
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2009 Buick Lucerne has 8 documented issues. The most frequently reported are: Fuel Pump Relay Overheats and Melts Fuse Box (Crank/No-Start, Stalling), Heated Windshield Washer Fluid Module Fire Risk (Microheat), Ignition Switch Can Slip Out of Run Position. Of these, 5 are rated critical and should be addressed promptly.
Is the Buick Lucerne reliable?
The 2009 Buick Lucerne has 8 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 5 issues are rated critical: Fuel Pump Relay Overheats and Melts Fuse Box (Crank/No-Start, Stalling) and Heated Windshield Washer Fluid Module Fire Risk (Microheat) and Ignition Switch Can Slip Out of Run Position and Northstar 4.6L V8 Head Gasket / Head Bolt Thread Failure and Lucerne Northstar V8 Head Bolt Pull / Coolant Loss. 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 Buick Lucerne problems?
Repair costs for known Buick Lucerne issues range from $150 to $7,500, 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 2008-2011 Buick Lucerne Fuel Pump Relay Overheats and Melts Fuse Box (Crank/No-Start, Stalling)?
On 2008-2011 Lucernes the fuel pump relay terminals in the rear fuse box (located under the rear seat) overheat and melt, partly because the rear seat bracket presses on the fuse box lid. This burns the relay socket, cuts power to the fuel pump, and causes stalling, no-starts, an… Severity: high.
What is the 2006-2009 Buick Lucerne Heated Windshield Washer Fluid Module Fire Risk (Microheat)?
Lucernes equipped with the heated washer fluid feature use a Microheat control module that can short-circuit on its printed circuit board, overheating the ground wire. This can produce odor, smoke, and an underhood fire. GM's first 2008 fix did not stop the fires, forcing a secon… Severity: high.
What is the 2006-2011 Buick Lucerne Ignition Switch Can Slip Out of Run Position?
On 2006-2011 Lucernes, the weight of keys on the ring combined with a jarring bump or rough road can knock the ignition switch out of the 'run' position. This shuts off the engine while driving and disables power assist. If the switch is not in run, the airbags may not deploy in… Severity: high.
What is the 2006-2011 Buick Lucerne Northstar 4.6L V8 Head Gasket / Head Bolt Thread Failure?
On V8 (4.6L Northstar) Lucernes, the aluminum block's head-bolt threads can strip, allowing the head gaskets to lose clamping force and fail. This typically shows up between roughly 100,000-160,000 miles as overheating, coolant loss with no visible external leak, and combustion g… Repairs typically run $2,500-$5,000. Severity: high.
What is the 2006-2011 Buick Lucerne Lucerne Northstar V8 Head Bolt Pull / Coolant Loss?
The 4.6L Northstar V8 in 2006-2011 Lucerne CXS/Super (and STS, DTS, Cadillac SLS) is known for head-bolt thread pull from the aluminum block. Bolts back out of the block (rather than head gasket failing outright), allowing combustion gases into the coolant. Symptoms: coolant loss… Repairs typically run $3,500-$7,500. Severity: high.
What is the 2006-2011 Buick Lucerne Throttle Body / Throttle Position Sensor Causing Reduced Engine Power?
A failing electronic throttle body or throttle position sensor triggers a 'Reduced Engine Power' message and limp mode, with rough or surging idle and hesitant acceleration. The condition is common enough that GM issued a special coverage adjustment extending the throttle body wa… Repairs typically run $250-$600. Severity: medium.
What is the 2006-2011 Buick Lucerne Rear Air Self-Leveling Suspension Failure (Sagging Rear)?
Lucernes with the rear automatic load-leveling air suspension (common on CXL/CXS) develop a sagging or uneven rear ride height as the system ages. Causes include leaking air shocks, a failed air compressor, a stuck relief solenoid (built into the compressor and not separately ser… Repairs typically run $250-$700. Severity: low.
What is the 2006-2009 Buick Lucerne Intermediate Steering Shaft Clunk During Slow Turns?
Owners frequently report a clunk, knock, or rubbing noise/feel when turning the wheel at low speeds, most noticeable in parking-lot maneuvers. The cause is worn or improperly seated U-joints (cardan joint) in the intermediate steering shaft between the column and the rack, not th… Repairs typically run $150-$350. Severity: low.
