The 2007 Grand Prix, built on GM's W-body platform, is generally reliable with the 3.8L V6 (Series III) but suffers from typical GM transmission issues, ignition system gremlins, and intake manifold failures that can strand you if ignored.
Lower Intake Manifold Gasket Failure (3.8L V6)
Common · high severity
Typical onset: 80,000-140,000 mi
Symptoms: Coolant loss with no visible external leaks, White smoke from exhaust on cold start, Milky oil or coolant in oil if severe, Overheating or rough idle
Fix: Replace lower intake manifold gaskets, often upgrade to Felpro 1250 metal gasket set. Requires removing upper plenum and fuel rails. 4-6 hours labor. Catch it early before coolant contaminates oil and damages bearings.
Estimated cost: $600-1,200
4T65-E Automatic Transmission Failure
Common · high severity
Typical onset: 100,000-150,000 mi
Symptoms: Harsh 1-2 or 2-3 shifts, especially when cold, Slipping under acceleration, No reverse or delayed engagement, Shuddering during light throttle at 40-50 mph
Fix: The 4T65-E is known for worn 2nd gear band, pressure control solenoid issues, and torque converter shudder. Fluid changes every 30k can help but many need rebuild or replacement by 120k. Rebuild runs 12-18 hours labor, used trans swap 8-10 hours.
Estimated cost: $2,200-3,800
Ignition Control Module / Coil Pack Failure
Common · medium severity
Typical onset: 60,000-120,000 mi
Symptoms: Random misfires, often P0300 plus cylinder-specific codes, Stalling when hot, restarts when cool, Rough idle and hesitation, No-start condition after heat soak
Fix: The ignition control module under the coil packs fails from heat cycling. Replace both coil packs and ICM together—doing one without the other often leads to comeback. 2-3 hours labor. Use AC Delco parts, not cheap aftermarket.
Estimated cost: $450-750
Power Steering Pump Whine and Leak
Occasional · medium severity
Typical onset: 90,000-140,000 mi
Symptoms: High-pitched whine on startup or when turning, Fluid leaking from pump or high-pressure line, Intermittent hard steering, Groaning noise during lock-to-lock turns
Fix: The pump develops internal wear and shaft seal leaks. Often the pressure line connection also weeps. Replace pump and inspect all hoses. 2.5-3.5 hours labor. Flush system with fresh Dex-VI fluid.
Estimated cost: $400-650
Idler Pulley / Tensioner Bearing Failure
Occasional · high severity
Typical onset: 80,000-130,000 mi
Symptoms: Squealing or grinding noise from accessory belt area, Noise increases with RPM or when A/C engages, Belt slipping or shredding, Sudden belt failure can overheat engine immediately
Fix: The smooth idler pulley bearing seizes and can throw the serpentine belt. Inspect tensioner and all pulleys together—replace anything that doesn't spin freely or has play. 1.5-2 hours labor. Do this before failure, not after.
Estimated cost: $250-450
Freeze Plug (Core Plug) Corrosion and Leaks
Occasional · medium severity
Typical onset: 100,000+ mi
Symptoms: Coolant dripping from bell housing area or rear of engine, Persistent coolant loss with no obvious leak up front, Steam or coolant smell after driving
Fix: Rear freeze plugs rust through, especially if coolant wasn't maintained. Repair requires transmission removal to access rear bank on V6. 8-12 hours labor. Replace all accessible plugs while trans is out.
Estimated cost: $900-1,600
Crankshaft Position Sensor Intermittent Failure
Occasional · high severity
Typical onset: 70,000-140,000 mi
Symptoms: Random no-start, cranks but won't fire, Stalling while driving with no warning, Tachometer drops to zero during stall, P0336 or P0385 codes may or may not be present
Fix: Sensor fails when hot due to heat soak from exhaust. Located behind the harmonic balancer, requires removing front accessory drive components. 2-3 hours labor. Replace both crank and cam sensors together for best reliability.
Estimated cost: $350-550
Owner tips
Change transmission fluid every 30,000 miles—the 4T65-E doesn't tolerate neglect
Use Dex-Cool only and flush cooling system every 5 years to prevent intake gasket failure
Inspect serpentine belt system annually; idler pulley failure will strand you instantly
Watch for coolant consumption—catch intake gaskets before they destroy the engine
The 3.8L V6 model is a decent used buy under $5k if the intake gaskets and transmission have been done—just budget for ignition parts and don't skip fluid changes.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
Fitment notes: Side post terminals standard on GM vehicles; GXP trim with 5.3L V8
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Every control module on the 2004-2008 Pontiac Grand Prix — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
Electric Power Steering Control Module (EPSCM)2.5 hr R&Rdealer / factory tool +0.4 hr▸ programming details
📍 On steering column or integrated with steering gear
⚠️ Optional equipment. Sensor calibration may be required. Configuration typically auto-learns from VIN broadcast.
Radio/Entertainment System (RAD)0.8 hr R&Raftermarket tool +0.2 hr▸ programming details
📍 Center dash radio cavity
🔧 Tech 2 or Theftlock code entry
⚠️ Theftlock security code required. Some models have navigation or premium audio requiring additional configuration.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
General Motors LLC (GM) is recalling certain model year 2007 Pontiac Grand Prix, 2006-2009 Buick LaCrosse, 2006-2007 Buick Rainier, Chevrolet Trailblazer, GMC Envoy, 2006 Chevrolet Trailblazer EXT, GMC Envoy XL, 2006-2008 Isuzu Ascender, and Saab 9-7x vehicles. In the affected vehicles, the headlamp driver module (HDM) may overheat and fail, causing the headlamps and daytime running lights to not illuminate.
Consequence: Headlamps that do not illuminate reduce the driver's ability to see the roadway and reduce the vehicle's visibility to oncoming vehicles, both of which increase the risk of a vehicle crash.
Remedy: GM will notify owners, and dealers will replace the HDM, free of charge. The recall began on May 17, 2016. Owners may contact Buick customer service at 1-800-521-7300 or Pontiac customer service at 1-800-762-2737. GM's number for this recall is 14291.
ELECTRICAL SYSTEM:IGNITION · 14V400000
2014-07-03
This defect can affect the safe operation of the airbag system. Until this recall is performed, customers should remove all items from their key rings, leaving only the ignition key. The key fob (if applicable), should also be removed from the key ring.
General Motors LLC (GM) notified the agency on July 3, 2014, that they are recalling 5,877,718 model year 2000-2005 Chevrolet Impala and Monte Carlo, 1997-2003 Chevrolet Malibu, 2004-2005 Malibu Classic, 1999-2004 Oldsmobile Alero, 1998-2002 Oldsmobile Intrigue, 1999-2005 Pontiac Grand Am and 2004-2008 Pontiac Grand Prix vehicles. In these models, the weight on the key ring and/or road conditions or some other jarring event may cause the ignition switch to move out of the run position, turning off the engine.
Consequence: If the key is not in the run position, the air bags may not deploy if the vehicle is involved in a crash, increasing the risk of injury.
Remedy: GM will notify owners, and dealers will install two key rings and an insert in the key slot or a cover over the key head on all ignition keys, free of charge. The recall began on September 9, 2014. GM's number for this recall is 14350.
STEERING · 09E005000
2009-02-17
DORMAN IS RECALLING 979 STEERING KNUCKLES, DORMAN P/NOS. 697-902 AND 697-903, SOLD UNDER DORMAN'S "OE SOLUTIONS<SUP>TM</SUP>" BRAND NAME, AND NAPA P/NOS. 7-8502 AND 7-8503 WHICH WERE SOLD FOR REPLACEMENT USE ON THE VARIOUS VEHICLES LISTED ABOVE. A POTENTIAL MATERIAL OR DESIGN DEFECT COULD RESULT IN THE STEERING KNUCKLE BREAKING IN THE HUB AREA.
Consequence: A BROKEN STEERING KNUCKLE COULD RESULT IN LOSS OF STEERING CONTROL AND A POSSIBLE CRASH WITHOUT WARNING.
Remedy: DORMAN WILL NOTIFY OWNERS AND REPLACE THE DEFECTIVE STEERING KNUCKLES FREE OF CHARGE AND REIMBURSE THE REPAIR FACILITY OR OWNER FOR LABOR. THE RECALL BEGAN ON FEBRUARY 23, 2009. OWNERS MAY CONTACT DORMAN'S TOLL-FREE HOTLINE AT 1-800-523-2492 AND PRESS 5.
FUEL SYSTEM, GASOLINE:STORAGE · 06V419000
2006-10-31
ON CERTAIN VEHICLES, THE FUEL TANK IS MISSING THE ADHESIVE LAYER THAT BONDS THE BARRIER LAYER TO THE OUTER SHELL OF THE FUEL TANK.
Consequence: WITH THIS CONDITION, FUEL AND/OR FUEL VAPORS COULD SEEP OUT BETWEEN THE LAYERS, INCREASING THE RISK OF A FIRE.
Remedy: DEALERS WILL INSPECT THE SERIAL NUMBER ON THE FUEL TANK AND REPLACE THE FUEL TANK IF NECESSARY. THE RECALL BEGAN ON NOVEMBER 13, 2006. OWNERS MAY CONTACT BUICK AT 1-866-608-8080, CHEVROLET AT 1-800-630-2438, OR PONTIAC AT 1-800-620-7668.
Fuel economy (EPA)
City
16mpg
Highway
25mpg
Combined
19mpg
Fuel
Premium Gasoline
Capability & size
EPA class
Midsize Cars
Wiper blades
2004-2008 generation (W-body refresh). Coupe discontinued after 2003; this is sedan only.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2007 Pontiac Grand Prix 5.3L V8 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.