The 2007 GMC Canyon is a compact pickup built on GM's GMT355 platform, shared with the Chevrolet Colorado. The I5 engines (3.5L/3.7L) are generally more durable than the I4s, but this generation suffers from transmission cooler failures, fuel system quirks, and catastrophic I4 engine problems that can grenade the bottom end.
Transmission Oil Cooler Line Failure and Internal Cooler Contamination
Common · high severityTypical onset: 80,000-140,000 mi
Symptoms: Transmission fluid in coolant (strawberry milkshake in overflow tank), Coolant in transmission causing slipping, delayed shifts, or no movement, Pink residue on transmission dipstick, Overheating transmission or engine
Fix: Replace transmission cooler lines (prone to corrosion at crimps), flush or replace radiator if internal cooler failed, complete transmission flush or rebuild if coolant contaminated the trans. If caught early, external line replacement is 2-3 hours; if internal cooler failed and contaminated transmission, expect transmission rebuild. 8-12 hours total for trans R&R and rebuild.
Estimated cost: $400-800 for lines and flush if caught early; $2,500-4,200 for transmission rebuild if contaminated
2.8L/2.9L I4 Catastrophic Bottom-End Failure
Occasional · high severityTypical onset: 100,000-150,000 mi
Symptoms: Knocking or rattling from lower engine block, Sudden loss of oil pressure, Metal shavings in oil, Engine seizure or rod through block in worst cases
Fix: These I4 engines have weak piston skirts and inadequate oiling to rod bearings under sustained load or poor maintenance. Requires complete engine rebuild (pistons, rings, bearings, crank polishing) or short-block replacement. 18-24 hours for removal, rebuild/replace, and reinstall.
Estimated cost: $3,500-6,000 for rebuild; $4,500-7,000 for reman short block installed
Fuel Pump and Fuel Filter Clogging Issues
Common · medium severityTypical onset: 90,000-130,000 mi
Symptoms: Hard starting after sitting or when tank below 1/4, Loss of power under load or highway acceleration, Sputtering or stalling in hot weather, Check engine light with lean fuel codes (P0171/P0174)
Fix: In-tank fuel filter (part of pump assembly) clogs with sediment; GM didn't make it serviceable separately on most years. Fuel pump replacement required in most cases. Tank drop and pump replacement is 2.5-3.5 hours. Some model years have a serviceable inline filter—replace that first if equipped (0.5 hours).
Estimated cost: $600-1,000 for fuel pump assembly replacement; $80-150 for inline filter if equipped
3.5L/3.7L I5 Head Gasket Seepage and Valve Cover Leaks
Occasional · medium severityTypical onset: 120,000-180,000 mi
Symptoms: Coolant weeping from head gasket area, especially driver side, Oil leaking from valve cover onto exhaust manifold (burning oil smell), Slight coolant loss with no visible external leaks, White residue around head bolt holes
Fix: I5 head gaskets can weep externally (rare to fail internally). Valve cover gaskets harden and leak. Head gasket replacement on one side is 8-10 hours (both sides 14-16 hours); valve covers are 2-3 hours. If doing head gaskets, replace valve cover gaskets, timing components, and water pump at same time.
Estimated cost: $1,200-1,800 for valve covers; $2,200-3,500 for single head gasket; $3,800-5,500 for both heads
Transmission Mount Failure (4L60E/4L65E Automatics)
Common · low severityTypical onset: 70,000-110,000 mi
Symptoms: Clunk when shifting from park to drive or reverse, Vibration at idle in gear, Excessive driveline movement when accelerating or braking, Visible torn or collapsed rubber on transmission mount
Fix: Rubber transmission mount tears from engine torque and age. Simple replacement with quality aftermarket or OEM mount. 1-1.5 hours labor. Inspect engine mounts at same time—often deteriorated as well.
Estimated cost: $200-350
Brake Light Switch Failure (NHTSA Recall 07V422000)
Occasional · medium severitySymptoms: Brake lights stuck on or not working at all, Cannot shift out of park (brake interlock failure), Cruise control not disengaging when braking, Battery drain if lights stuck on
Fix: Brake pedal position switch fails due to internal contact wear. Recall may have addressed some vehicles, but switches continue to fail with age. Simple replacement at pedal assembly, 0.5 hours. Check if recall was completed; if not, dealer may cover.
Estimated cost: $120-200 if not recall-covered
Buy an I5-powered Canyon with service records; avoid I4 models unless you can verify obsessive oil changes and listen for bearing noise—these can lunch the bottom end with little warning.
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.