Makes / Mercedes-Benz / GL450
Mercedes-Benz Repair • Phoenix, AZ
Mercedes-Benz GL450 Repair in Phoenix, AZ
Common problems, safety recalls and expert service for the Mercedes-Benz GL450 (2017).
Own a Mercedes-Benz GL450 in the Phoenix area? EZ Swap LLC repairs and maintains the Mercedes-Benz GL450 for model years 2017. Our shop at 9050 N 9th St handles everything from routine service to diagnostics and major repairs.
To help GL450 owners know what to watch for, we reviewed public records from the National Highway Traffic Safety Administration (NHTSA). For these model years NHTSA has 1 owner complaint on file for the GL450 and 0 safety recall campaigns. The most-reported problem areas are engine (1).
Most-Reported Mercedes-Benz GL450 Problems
These problem areas come up most often in NHTSA owner complaints for the GL450 (all model years combined). Complaint counts reflect reports filed, not the share of vehicles affected, so popular and older models naturally have more.
| Problem area (NHTSA component) | Complaints | Share | |
|---|---|---|---|
| Engine | 1 | 100% |
Engine
1 of the 1 complaints (100%) mention the engine and cooling system. Engine and cooling complaints are best caught early in Phoenix, where heat pushes cooling systems and engine oil to their limits. We diagnose warning lights and check coolant, hoses and oil condition. See our check engine light diagnostics and oil change & maintenance pages.
Mercedes-Benz GL450 Check Engine Codes
NHTSA owner complaints rarely cite specific trouble codes for the GL450, so we do not have a model-specific ranking to show. These are the check engine codes we see most often on vehicles in Phoenix heat, and any of them can show up on a Mercedes-Benz.
| Code | What it means |
|---|---|
| P0420 | Catalyst efficiency below threshold (bank 1) Often a worn catalytic converter, but failing oxygen sensors or exhaust leaks can set it too. Can cause an emissions test failure. |
| P0300 | Random or multiple cylinder misfire Worn spark plugs, failing ignition coils, fuel or vacuum problems. Do not ignore a flashing check engine light. |
| P0171 | System too lean (bank 1) Often a vacuum leak, dirty MAF sensor, weak fuel delivery or a failing oxygen sensor. |
| P0455 | EVAP system large leak Missing or loose gas cap, or a disconnected or cracked vapor hose. |
| P0128 | Coolant temperature below thermostat regulating temperature Usually a thermostat stuck open. Fix it to restore efficiency and cabin heat. |
| P0442 | EVAP system small leak Loose or worn gas cap, cracked hose or purge or vent valve. |
| P0301 | Cylinder 1 misfire Commonly a bad spark plug or ignition coil on that cylinder. |
| P0401 | EGR flow insufficient Clogged EGR passages or a stuck EGR valve. |
Got a check engine light on your GL450? A code is a clue, not a diagnosis, so we scan it and test the system before replacing anything. See our check engine light diagnostics.
Serious Incident Reports
Of the NHTSA complaints on file for the GL450, 1 involved a fire. These numbers are drawn from self-reported complaints and are not verified findings. If your vehicle has an open recall, get it repaired promptly.
Keeping a Mercedes-Benz GL450 Reliable in Phoenix
Arizona heat is the hardest test a Mercedes-Benz will face. Batteries, belts, hoses, tires and engine oil all wear faster here, and a GL450 that spends its life in stop-and-go Valley traffic needs maintenance earlier than the owner's manual's normal schedule suggests.
Our recommendation for GL450 owners: follow the severe-service schedule, test the battery before every summer, inspect brakes and tires twice a year, and have any warning light diagnosed instead of ignored. If you are shopping for a used Mercedes-Benz GL450, a pre-purchase inspection shows what the paperwork does not.
Mercedes-Benz GL450 Services at EZ Swap LLC
Get the details on our Phoenix Mercedes-Benz GL450 repair service, or choose a service below.
Check Engine Light Diagnostics
Scan, test and pinpoint the real cause.
Details →Oil Change & Maintenance
Oil, filters, fluids, tires and scheduled service.
Details →Car A/C Repair
Phoenix heat demands cold air.
Details →Pre-Purchase Inspection
Know the car before you buy it.
Details →Rideshare Inspection Prep
Get approved for Uber, Lyft and more.
Details →Mercedes-Benz GL450 FAQ
What are the most common problems with the Mercedes-Benz GL450?
Based on NHTSA owner complaints, the most-reported problem areas for the Mercedes-Benz GL450 are engine (1). Complaint counts reflect reports filed, not the share of vehicles affected.
Which GL450 model years have the most complaints?
The GL450 model years with the most NHTSA complaints on file are 2017. Older years have had longer to collect reports, so inspect any specific vehicle before buying.
What check engine codes are common on the Mercedes-Benz GL450?
NHTSA complaints rarely cite specific codes for the Mercedes-Benz GL450. On Phoenix vehicles in general, we see P0420, P0300 misfires, P0171 lean conditions and EVAP leaks such as P0455 and P0442 most often. Bring yours in and we will scan and test it.
Does the Mercedes-Benz GL450 have any safety recalls?
NHTSA lists 0 recall campaigns for the Mercedes-Benz GL450 across model years 2017. Each recall applies only to certain vehicles, so enter your VIN at nhtsa.gov/recalls to see if yours is affected.
Do you repair the Mercedes-Benz GL450 in Phoenix?
Yes. EZ Swap LLC repairs and maintains Mercedes-Benz vehicles including the GL450, at 9050 N 9th St in Phoenix. Call or text (602) 246-9063 for an appointment.
Is a pre-purchase inspection worth it for a used Mercedes-Benz GL450?
Yes. An inspection checks the engine, transmission, brakes, suspension, A/C and electrical system, and scans for stored codes, so you know the real condition before you buy.
How often should I service my Mercedes-Benz GL450 in Phoenix?
Follow the severe-service schedule in your owner's manual, since heat and stop-and-go driving count as severe use. Test the battery before summer and inspect brakes and tires regularly.
More Mercedes-Benz Models We Service
Source: public complaint and recall records from the National Highway Traffic Safety Administration (nhtsa.gov). Counts reflect reports filed and do not predict the condition of any individual vehicle.