2012 — 2020
2.5L (LKH) Duramax Turbo Diesel - DX/LX
Diesel
During your test drive, find a stretch of road to gently accelerate in 2nd or 3rd gear; pay close attention to the transmission for any shuddering or 'flaring' as it shifts, as these units can sometimes show signs of wear.
Before starting the engine, check the coolant reservoir for any oily residue or signs of contamination, as the oil cooler housing has been known to be a point of consideration in higher-kilometer examples.
With the engine at operating temperature, perform a few low-speed manoeuvres and listen for any clicking or knocking sounds from the front end, which may indicate that the front suspension bushings or CV joints might be nearing the end of their service life.
While parked on a flat surface, cycle through the 4WD selector switch from 2H to 4H and 4L to ensure the electronic actuator engages smoothly without excessive delay or warning lights appearing on the dash.
Usually marks the point where cooling system hoses and thermostat housings benefit from a proactive inspection.
A common window to check for DPF (Diesel Particulate Filter) health and ensure the EGR system has been cleaned or serviced.
Typically the stage where suspension components like shock absorbers and control arm bushes might be due for a refresh to maintain the factory ride quality.
Ensure the oil filter and high-quality synthetic diesel engine oil have been changed every 10,000km or annually.
Check the service history for evidence of regular fuel filter replacements, which is vital for protecting the fuel injectors.
Confirm the transmission fluid has been serviced, even if the manual suggests it is a 'sealed for life' unit.
Inspect the serpentine belt and tensioner for any signs of cracking or 'chirping' noises during idle.
Verify that the brake fluid has been flushed every two years to maintain optimal stopping power and protect the ABS module.
Estimated repair costs if issues arise
If the transmission starts showing signs of shuddering, a fluid flush may help, but if the torque converter is worn, you might eventually need to budget for a specialist transmission shop visit.
Depending on the car's history of short vs. long trips, the Diesel Particulate Filter may eventually require a professional clean or a forced regeneration to clear out accumulated soot.
In cars of this age, the factory suspension may begin to feel tired; if you notice the vehicle 'bottoming out' or handling poorly, you might want to budget for new shocks and bushings.
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Disclaimer: This report is generated with the assistance of AI analysis based on verified automotive data. While we strive for 100% accuracy, enthusiasts should always conduct physical inspections and consult service records. View Full Disclaimer