Pontiac · Known Issues

2007 Pontiac G6 Problems: 15 Issues Every Owner Should Know

2007 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated June 2026

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2007 Pontiac G6 has 15 documented known issues, with 7 rated critical. The most serious are Low-Beam Headlight Connector Melting / Pigtail Burn ($25-$200 repair), Retractable Hardtop Hydraulic Pump and Microswitch Failures ($400-$2,500 repair), Reduced Engine Power / throttle limp mode (P2135, P0121, P2101) ($250-$500 repair), Intake manifold gasket coolant leak (3.5L V6) ($610-$718 repair), G6 2.4L Ecotec (LE5/LAT) Timing Chain Stretch ($1,200-$2,500 repair), Transmission shift cable / vehicle not actually in Park (rollaway) and Sudden loss of electric power steering (EPS) assist ($0-$1,000 repair). Across all issues, repair costs range from $20 to $2,500. DIY maintenance guides at au7o.io.

All 15 Known Issues

On the 2006-2010 Pontiac G6, g6 owners frequently see a 'Reduced Engine Power' message with the car dropping into limp mode, triggered by throttle position sensor voltage-correlation faults. The throttle body's integrated TPS develops dirty or shorting solder points (sometimes attributed to 'tin whiskers') and corrosion at the connector, so the two throttle sensor signals disagree and the ECM cuts power for safety.

This issue also affects: Chevrolet Impala, Chevrolet Suburban, Chevrolet Tahoe

Common Symptoms

Reduced Engine Power warning message
Sudden loss of acceleration / limp mode
Hesitation or rough idle
Check engine light

How to Fix

Inspect and clean the throttle body and TPS connector; check wiring for corrosion/water intrusion. The common fix is replacing the electronic throttle body assembly; relearn the throttle after replacement.

Typical repair cost:$250 - $500

Research This Issue

0+ owners have reported this issue

Google Reddit YouTube NHTSA

Community Reported

High ConfidenceVerified0 reportsLast reported by owners Invalid DateReviewed Jun 2026

On the 2006-2009 Pontiac G6, the 3.5L 'wet' V6 routes engine coolant through passages in the intake manifold, and the original plastic-framed lower intake manifold gaskets degrade and leak. This causes external coolant loss or, worse, coolant leaking internally and mixing with the engine oil, which can damage bearings and lead to overheating. (The later 3.9L V6 uses a 'dry' intake and is not prone to the same failure.)

Common Symptoms

Coolant loss with no obvious external leak
Sweet smell / coolant near the manifold
Overheating
Milky/foamy oil on dipstick or oil cap
Low coolant warnings

How to Fix

Replace the lower intake manifold gaskets, ideally with an upgraded metal-framed set (e.g., Fel-Pro). It's a 4-6 hour job; check the oil for a milky appearance before driving as a contaminated engine should not be run.

Typical repair cost:$610 - $718

Research This Issue

0+ owners have reported this issue

Google Reddit YouTube NHTSA

Community Reported

High ConfidenceVerified0 reportsLast reported by owners Invalid DateReviewed Jun 2026

On the 2007-2010 Pontiac G6 2.4L Ecotec LE5 / LAT (Hybrid), the 2.4L Ecotec LE5 in 2007-2010 G6 (and shared Cobalt SS, Malibu, HHR, Saturn Aura/Ion, Solstice) develops timing chain stretch — a very well-documented engineering issue across Ecotec forums and independent shops. Root cause: GM's original Oil Life Monitor allowed intervals up to 12,000 miles, starving the chain. Note: while GM issued Special Coverage Adjustment 11340C covering timing chain stretch on the 3.6L LFX/LLT V6, the 2.4L Ecotec did NOT receive the same blanket warranty extension. Some owners obtained goodwill repairs through dealer-level escalation.

This issue also affects: Buick LeSabre, Buick Park Avenue, Buick Cascada

Common Symptoms

cold start rattle
misfire
check engine light
reduced power

How to Fix

Full timing chain kit replacement (chain, tensioner, guides) ~$1,200-$2,000. If you experience the issue under 100,000 miles, request a goodwill-assistance review at a GM/Chevy dealer (not all approved, but some are). Use dexos1 full-synthetic 5W-30 and stick to 5,000-mile intervals going forward.

Typical repair cost:$1,200 - $2,500

Research This Issue

0+ owners have reported this issue

Google Reddit YouTube NHTSA

Manually Verified

High Confidence0 reportsLast reported by owners Invalid DateReviewed Invalid Date

On the 2005-2010 Pontiac G6, the headlight low-beam (H11/9006) connector on 2005-2010 G6s develops corrosion and high resistance, generating heat that melts the socket and pigtail. Owners report low beams burning out every few months, fuses popping, and visible browned/charred connectors when the bulb is pulled. Affects both sides, but driver's side first.

Common Symptoms

Low beam headlight repeatedly burns out
Melted/discolored headlight bulb connector
Headlight fuse blowing
One headlight intermittent or stays out

How to Fix

Replace the melted bulb socket pigtail with a ceramic high-temperature H11 connector kit (14-gauge wire) and pack the new connector with dielectric grease. Inspect both sides even if only one has failed.

Typical repair cost:$25 - $200

Research This Issue

0+ owners have reported this issue

Google Reddit YouTube NHTSA

Community Reported

High ConfidenceVerified0 reportsLast reported by owners Invalid DateReviewed Jun 2026

On the 2005-2010 Pontiac G6, common G6 fault pattern: simultaneous Service StabiliTrak, Service Traction Control, ABS warning lights, and sometimes Reduced Engine Power message. GM-acknowledged issue (TSB) traced to fretting corrosion on terminals of the Body Control Module connectors (especially the C2 connector) located behind the passenger kick panel. Micro-vibration causes oxidation on the contact surfaces; moisture intrusion from sunroof drains can accelerate it.

Common Symptoms

Service StabiliTrak and Service Traction Control messages
ABS warning light
Reduced Engine Power message
Intermittent communication codes (U-codes)

How to Fix

Remove the passenger kick panel to access the three large BCM connectors (especially the C2 connector); unlatch via the plastic levers, inspect for green/fretting corrosion, clean with electrical contact cleaner, apply dielectric grease per GM procedure (one-inch nylon bristle brush on C2 pins), and re-seat several times. Note: the 'Reduced Engine Power' message specifically is often caused by a separate IP-to-body harness connector in the DRIVER-side (left) kick panel carrying the APP signal — inspect both sides. Do NOT replace the BCM for this condition. Also scan wheel-speed and steering-position sensors before condemning the BCM.

Typical repair cost:$0 - $600

Research This Issue

0+ owners have reported this issue

Google Reddit YouTube NHTSA

Community Reported

High ConfidenceVerified0 reportsLast reported by owners Invalid DateReviewed Jun 2026

On the 2005-2010 Pontiac G6, the G6 is notorious for low-beam headlights that burn out or stop working repeatedly. The root cause is that the bulb generates more heat than the cheap plastic headlamp connector/socket can handle, so the connector overheats, melts, and loses contact. Owners often replace bulbs only to have them fail again within months because the connector and wiring are the real problem.

Common Symptoms

One or both low beams stop working
High beams still work but low beams don't
Headlight bulbs burn out every few months
Melted/discolored bulb connector
Blown headlight fuse

How to Fix

Replace the melted bulb socket/connector pigtail (often sold as a repair harness). A durable fix is upgrading to ceramic or gold-plated soldered connectors. Inspect fuses (commonly 7 and 9) and the headlight switch/wiring for corrosion.

Typical repair cost:$20 - $150

Research This Issue

0+ owners have reported this issue

Google Reddit YouTube NHTSA

Community Reported

High ConfidenceVerified0 reportsLast reported by owners Invalid DateReviewed Jun 2026

On the 2005-2010 Pontiac G6, the G6's Passlock theft-deterrent system can falsely trip, illuminating the security light and preventing the engine from starting. The common cause is a worn ignition lock cylinder/Passlock sensor that fails to read the lock rotation correctly. The well-known 10-minute relearn trick only resets it temporarily; the fault usually returns until the cylinder/sensor is replaced.

Common Symptoms

Car cranks but won't start
Security/anti-theft (padlock) light on or flashing
Intermittent no-start
Starts after waiting ~10 minutes

How to Fix

Temporary: turn key to ON and wait ~10 minutes until the security light stops flashing (repeat the relearn cycle as needed). Permanent fix is replacing the ignition lock cylinder / Passlock sensor and relearning the system, sometimes with a fresh dealer key.

Research This Issue

0+ owners have reported this issue

Google Reddit YouTube NHTSA

Community Reported

High ConfidenceVerified0 reportsLast reported by owners Invalid DateReviewed Jun 2026

On the 2006-2009 Pontiac G6, the G6 convertible (2007-2009) uses a complex 2-piece clamshell retractable hardtop with hydraulic rams and multiple position sensors. Hydraulic ram fluid leaks, weak/failed hydraulic pumps, and bad microswitches/latch sensors leave the top stuck halfway, lifting the trunk but failing to clear the windshield, or refusing to deploy at all.

Common Symptoms

Top stuck halfway up or down
Trunk opens but top will not move
Hydraulic fluid puddle in trunk
Top operation requires manual assistance
Squeaks, creaks, and rattles from roof

How to Fix

Diagnose with a scan tool that reads body module roof codes — most repairs are weak hydraulic pumps ($400-800), leaking rams ($600-1200), or microswitch/latch sensor replacement ($150-400). Keep trunk drain channel clear so a stuck top does not flood the trunk.

Typical repair cost:$400 - $2,500

Research This Issue

0+ owners have reported this issue

Google Reddit YouTube NHTSA

Community Reported

High ConfidenceVerified0 reportsLast reported by owners Invalid DateReviewed Jun 2026

On the 2005-2007 Pontiac G6, on 2005-2007 G6 sedans equipped with the optional four-panel C3Y panoramic sunroof, the factory drain tubes at the rear of the sunroof tray were cut too short and pop off the body grommets, dumping water into the headliner, rear floor, and trunk. GM issued service bulletin 06-08-57-004E (revised March 2009) with longer drain extensions for both panoramic and regular sunroof variants but did not formally recall it. The panoramic option was discontinued after 2007; 2008-2010 G6s have a smaller single-panel sunroof that can also exhibit similar drain issues addressed by the same TSB.

Common Symptoms

Wet headliner or rear floor carpet after rain
Water in trunk near rear seat back
Musty smell in cabin
Water dripping from seatbelt anchors

How to Fix

Reattach and extend rear sunroof drains per GM TSB 06-08-57-004E (use longer hose with proper grommets). Clear all four drain tubes with low-pressure compressed air. Avoid wire snakes, which can puncture the tubes.

Typical repair cost:$50 - $600

Research This Issue

0+ owners have reported this issue

Google Reddit YouTube NHTSA

Community Reported

High ConfidenceVerified0 reportsLast reported by owners Invalid DateReviewed Jun 2026

On the 2005-2010 Pontiac G6, g6 rocker panels and lower door edges develop severe rust-through, especially in salt-belt states. The rockers are welded into the body sill (not bolt-on), with poor factory undercoating in the seam. Owners report visible holes and crumbling metal by 8-12 years of age. Same pattern as sibling Saturn Aura and Chevy Malibu (Epsilon platform).

Common Symptoms

Bubbling paint along rocker panel
Rust holes ahead of rear wheel arch
Crumbling lower door edges
Rust at rear-door bottom corners

How to Fix

Catch early: grind to bare metal, treat with rust converter, prime and topcoat. Advanced cases require cut-and-weld rocker patch panels ($200 per side in parts, ~$1000 body-shop labor). GM's 6-year/100k corrosion warranty has long expired on these vehicles.

Typical repair cost:$200 - $1,500

Research This Issue

0+ owners have reported this issue

Google Reddit YouTube NHTSA

Community Reported

High ConfidenceVerified0 reportsLast reported by owners Invalid DateReviewed Jun 2026

On the 2005-2010 Pontiac G6, g6 sedans equipped with the large panoramic (multi-panel) sunroof commonly leak water into the cabin. The frequent culprit is the sunroof drain tubes, which GM cut short, allowing them to pull off their outlets so water drains onto the seat belts, under the rear seat, and into the carpet. Owners also report the motorized sunshade buckling/breaking, panel pins/screws falling out, and the roof getting stuck.

Common Symptoms

Water in rear footwell / under rear seat
Wet seat belts or headliner
Sunshade won't move or buckles
Sunroof stuck open or closed
Rattles from sunroof panels

How to Fix

Clear and re-secure or replace the sunroof drain tubes so they stay seated at the outlets; repair or replace the sunshade mechanism and any loose panel hardware. Keep drains clear of debris.

Research This Issue

0+ owners have reported this issue

Google Reddit YouTube NHTSA

Community Reported

High ConfidenceVerified0 reportsLast reported by owners Invalid DateReviewed Jun 2026

On the 2005-2010 Pontiac G6, on G6 models with the 4-speed automatic, the tabs on the transmission shift cable end can fracture/separate, or the shift cable adjustment clip may not be fully engaged. When this happens the shifter position and the actual transmission gear no longer match, so the driver can move the lever to Park and remove the key while the transmission is not truly in Park. This created a documented rollaway hazard and was the subject of NHTSA recalls 09V073000 and 14V224000.

Common Symptoms

Shifter says Park but car can roll
Key can be removed while not fully in Park
Vehicle rolls away after being parked
Shift lever position doesn't match gear
Hard to get out of or into Park

How to Fix

Under recall, dealers install a retainer/clip over the cable end or replace the shift cable as necessary, at no charge. Out of recall, the shift cable assembly is replaced. Use the parking brake until repaired.

Research This Issue

0+ owners have reported this issue

Google Reddit YouTube NHTSA

Community Reported

High ConfidenceVerified0 reportsLast reported by owners Invalid DateReviewed Jun 2026

On the 2005-2009 Pontiac G6, the Pontiac G6's electric power steering can suddenly lose assist while driving, requiring much greater effort to steer, especially at low speeds. The failure traces to the torque sensor assembly and/or EPS motor controller and was the single most-complained-about defect on the G6. GM issued a federal recall (NHTSA 14V153000, expanded by 15V064000) covering 2005-2009 models.

Common Symptoms

Steering suddenly becomes very heavy/hard to turn
Power steering warning light
Loss of assist at low speed or when parking
Intermittent assist that comes and goes

How to Fix

Under recall, dealers replace the torque sensor assembly and/or EPS motor controller unit per the bulletin matching the vehicle's build date, free of charge. Out of recall, the EPS column/motor or torque sensor is replaced. Many owners reported onset around 70,000-100,000 miles.

Typical repair cost:$0 - $1,000

Research This Issue

0+ owners have reported this issue

Google Reddit YouTube NHTSA

Community Reported

High ConfidenceVerified0 reportsLast reported by owners Invalid DateReviewed Jun 2026

On the 2005-2010 Pontiac G6, the pressed-on front wheel hub/bearing units on 2005-2010 G6s fail commonly between 70k-120k miles, producing a humming, roaring, or growling noise that increases with speed and changes pitch when turning (load shift to the bad side makes it quieter). Eventually causes ABS light and wheel play.

Common Symptoms

Humming or growling noise that worsens with speed
Noise pitch changes when turning
ABS or traction control light
Vibration through steering wheel

How to Fix

Replace the failed bolt-on front hub assembly (DIY-friendly, no press needed). Test by swerving gently at 40-50 mph: noise quieter on right turn = left bearing bad. Use Timken/SKF/Moog for longevity.

Typical repair cost:$150 - $550

Research This Issue

0+ owners have reported this issue

Google Reddit YouTube NHTSA

Community Reported

High ConfidenceVerified0 reportsLast reported by owners Invalid DateReviewed Jun 2026

On the 2005-2010 Pontiac G6, the sealed front wheel bearing/hub assemblies on the 2005-2010 G6 commonly wear out, producing a loud humming or grinding noise that rises with speed and changes when turning. If a turn to one side worsens the noise, the failing bearing is typically on the opposite side. Left unrepaired, a bearing can seize or fail completely, which is a serious safety risk.

Common Symptoms

Humming/growling that increases with speed
Noise changes when turning left vs right
Grinding from the front end
Vibration felt through the floor/steering

How to Fix

Replace the affected front wheel bearing/hub assembly (a bolt-on unit). They are often replaced in pairs; quality units (e.g., Timken/SKF) are recommended.

Typical repair cost:$384 - $1,208

Research This Issue

0+ owners have reported this issue

Google Reddit YouTube NHTSA

Community Reported

High ConfidenceVerified0 reportsLast reported by owners Invalid DateReviewed Jun 2026

Frequently Asked Questions

What are the most common Pontiac G6 problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2007-2007 Pontiac G6 has 15 documented issues. The most frequently reported are: Low-Beam Headlight Connector Melting / Pigtail Burn, Retractable Hardtop Hydraulic Pump and Microswitch Failures, Reduced Engine Power / throttle limp mode (P2135, P0121, P2101). Of these, 7 are rated critical and should be addressed promptly.

Is the Pontiac G6 reliable?

The 2007-2007 Pontiac G6 has 15 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 7 issues are rated critical: Low-Beam Headlight Connector Melting / Pigtail Burn and Retractable Hardtop Hydraulic Pump and Microswitch Failures and Reduced Engine Power / throttle limp mode (P2135, P0121, P2101) and Intake manifold gasket coolant leak (3.5L V6) and G6 2.4L Ecotec (LE5/LAT) Timing Chain Stretch and Transmission shift cable / vehicle not actually in Park (rollaway) and Sudden loss of electric power steering (EPS) assist. 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 G6 problems?

Repair costs for known Pontiac G6 issues range from $0 to $2,500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Low-Beam Headlight Connector Melting / Pigtail Burn, typically costs $25-$200 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2005-2010 Pontiac G6 Low-Beam Headlight Connector Melting / Pigtail Burn?

The headlight low-beam (H11/9006) connector on 2005-2010 G6s develops corrosion and high resistance, generating heat that melts the socket and pigtail. Owners report low beams burning out every few months, fuses popping, and visible browned/charred connectors when the bulb is pul… Repairs typically run $25-$200. Severity: high.

All 15 Known Issues

2006-2010 Pontiac G6: Reduced Engine Power / throttle limp mode (P2135, P0121, P2101)#

Common Symptoms

How to Fix

Research This Issue

2006-2009 Pontiac G6: Intake manifold gasket coolant leak (3.5L V6)#

Common Symptoms

How to Fix

Research This Issue

2007-2010 Pontiac G6: G6 2.4L Ecotec (LE5/LAT) Timing Chain Stretch#

Common Symptoms

How to Fix

Research This Issue

2005-2010 Pontiac G6: Low-Beam Headlight Connector Melting / Pigtail Burn#

Common Symptoms

How to Fix

Research This Issue

2005-2010 Pontiac G6: StabiliTrak / Traction Control / ABS Warning from BCM Connector Corrosion#

Common Symptoms

How to Fix

Research This Issue

2005-2010 Pontiac G6: Low-beam headlights repeatedly fail (melted bulb connector/socket)#

Common Symptoms

How to Fix

Research This Issue

2005-2010 Pontiac G6: Passlock anti-theft no-start (security light on)#

Common Symptoms

How to Fix

Research This Issue

2006-2009 Pontiac G6: Retractable Hardtop Hydraulic Pump and Microswitch Failures#

Common Symptoms

How to Fix

Research This Issue

2005-2007 Pontiac G6: Panoramic Sunroof Water Leak from Disconnected Drain Tubes#

Common Symptoms

How to Fix

Research This Issue

2005-2010 Pontiac G6: Rocker Panel and Lower Door Rust-Through#

Common Symptoms

How to Fix

Research This Issue

2005-2010 Pontiac G6: Panoramic sunroof leaks and mechanical failures#

Common Symptoms

How to Fix

Research This Issue

2005-2010 Pontiac G6: Transmission shift cable / vehicle not actually in Park (rollaway)#

Common Symptoms

How to Fix

Research This Issue

2005-2009 Pontiac G6: Sudden loss of electric power steering (EPS) assist#

Common Symptoms

How to Fix

Research This Issue

2005-2010 Pontiac G6: Front Wheel Hub Bearing Growl/Groan at Highway Speed#

Common Symptoms

How to Fix

Research This Issue

2005-2010 Pontiac G6: Front wheel bearing/hub failure (humming/grinding noise)#

Common Symptoms

How to Fix

Research This Issue

Tools that help with these problems

Other Pontiac Models

Frequently Asked Questions

What are the most common Pontiac G6 problems?

Is the Pontiac G6 reliable?

How much does it cost to fix common Pontiac G6 problems?

What is the 2005-2010 Pontiac G6 Low-Beam Headlight Connector Melting / Pigtail Burn?

What is the 2006-2009 Pontiac G6 Retractable Hardtop Hydraulic Pump and Microswitch Failures?

What is the 2006-2010 Pontiac G6 Reduced Engine Power / throttle limp mode (P2135, P0121, P2101)?

What is the 2006-2009 Pontiac G6 Intake manifold gasket coolant leak (3.5L V6)?

What is the 2007-2010 Pontiac G6 G6 2.4L Ecotec (LE5/LAT) Timing Chain Stretch?

What is the 2005-2010 Pontiac G6 Transmission shift cable / vehicle not actually in Park (rollaway)?

What is the 2005-2009 Pontiac G6 Sudden loss of electric power steering (EPS) assist?

What is the 2005-2010 Pontiac G6 Front Wheel Hub Bearing Growl/Groan at Highway Speed?

What is the 2005-2007 Pontiac G6 Panoramic Sunroof Water Leak from Disconnected Drain Tubes?

What is the 2005-2010 Pontiac G6 Rocker Panel and Lower Door Rust-Through?

What is the 2005-2010 Pontiac G6 StabiliTrak / Traction Control / ABS Warning from BCM Connector Corrosion?

What is the 2005-2010 Pontiac G6 Front wheel bearing/hub failure (humming/grinding noise)?

What is the 2005-2010 Pontiac G6 Low-beam headlights repeatedly fail (melted bulb connector/socket)?