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

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') a… Repairs typically run $250-$500. Severity: high.

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

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 mov… Severity: high.

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

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… Repairs typically run $1,200-$2,500. Severity: high.

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

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 patte… Repairs typically run $200-$1,500. Severity: medium.

What is the 2005-2010 Pontiac G6 Passlock anti-theft no-start (security light on)?

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 t… Severity: medium.

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

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 conn… Repairs typically run $0-$600. Severity: medium.

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

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 unr… Repairs typically run $384-$1,208. Severity: medium.

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

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… Repairs typically run $150-$550. Severity: medium.

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

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… Repairs typically run $20-$150. Severity: medium.

What is the 2005-2010 Pontiac G6 Panoramic sunroof leaks and mechanical failures?

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 th… Severity: low.

Pontiac · Known Issues

2010 Pontiac G6 Problems: 13 Known Issues

2010 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated August 2026

Share:@au7o.io

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2010 Pontiac G6 has 13 documented known issues, with 6 rated critical. The most serious are Low-Beam Headlight Connector Melting / Pigtail Burn ($25-$200 repair), NHTSA Recall 14V252000: BCM Connection Resistance Causes Brake Apply Sensor Voltage Fluctuations, Reduced Engine Power / throttle limp mode (P2135, P0121, P2101) ($250-$500 repair), Shift Cable End Tabs Fracture — Transmission May Not Actually Be in Park (Recall 12V460000), Transmission shift cable / vehicle not actually in Park (rollaway) and G6 2.4L Ecotec (LE5/LAT) Timing Chain Stretch ($1,200-$2,500 repair). Across all issues with published estimates, repair costs range from $20 to $2,500. DIY maintenance guides at au7o.io.

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 2010 Pontiac G6 has 13 documented issues. The most frequently reported are: Low-Beam Headlight Connector Melting / Pigtail Burn, NHTSA Recall 14V252000: BCM Connection Resistance Causes Brake Apply Sensor Voltage Fluctuations, Reduced Engine Power / throttle limp mode (P2135, P0121, P2101). Of these, 6 are rated critical and should be addressed promptly.

Is the Pontiac G6 reliable?

The 2010 Pontiac G6 has 13 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 6 issues are rated critical: Low-Beam Headlight Connector Melting / Pigtail Burn and NHTSA Recall 14V252000: BCM Connection Resistance Causes Brake Apply Sensor Voltage Fluctuations and Reduced Engine Power / throttle limp mode (P2135, P0121, P2101) and Shift Cable End Tabs Fracture — Transmission May Not Actually Be in Park (Recall 12V460000) and Transmission shift cable / vehicle not actually in Park (rollaway) and G6 2.4L Ecotec (LE5/LAT) Timing Chain Stretch. 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 13 Known Issues

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 2005-2010 Pontiac G6 NHTSA Recall 14V252000: BCM Connection Resistance Causes Brake Apply Sensor Voltage Fluctuations?

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

2005-2010 Pontiac G6: NHTSA Recall 14V252000: BCM Connection Resistance Causes Brake Apply Sensor Voltage Fluctuations#

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

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

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

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

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

2008-2010 Pontiac G6: Shift Cable End Tabs Fracture — Transmission May Not Actually Be in Park (Recall 12V460000)#

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

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

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

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

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