VT VX VY VZ Commodore Repair Manual
An OBD2 scanner is a great way to correctly diagnose issues and faults in newer model cars (mid 90’s onwards).
The VT Commodore changed everything for Holden. When it arrived in 1997, it was a massive leap forward over the old VS. The VT introduced a wider body, completely revised suspension, better safety, improved refinement and a much more modern feel overall. Holden sold an unbelievable number of them, and even today the VT remains one of the most recognisable Commodores ever built.
But the newest VT Commodore is now over 25 years old, and age catches up with everything eventually. Most surviving examples have high kilometres, questionable modifications, or years of neglected maintenance behind them.
Here are the most common VT Commodore problems owners and buyers should know about.
1. Ecotec V6 Intake Manifold Gasket Leaks
The 3.8-litre Ecotec V6 is one of Holden’s toughest engines, but intake manifold gasket leaks are incredibly common on VT Commodores.
Over time, the factory gaskets deteriorate and begin leaking coolant internally or externally. Many owners first notice disappearing coolant with no obvious leak.
Ignoring the problem can eventually lead to overheating and engine damage.
Common symptoms
- Coolant loss
- Overheating
- Milky oil
- Rough idle
- Coolant smell from engine bay
Fortunately, the repair itself is well understood and parts are inexpensive.
Related guide
- Ecotec Commodore Intake Manifold Gasket Problems
- Common Ecotec Engine Issues
- Best Coolants for Ecotec Commodore
2. Automatic Transmission Wear
The VT’s automatic transmissions are generally reliable if serviced properly, but plenty of cars have now lived hard lives.
Years of towing, burnouts, city driving and neglected servicing eventually take their toll. Many VTs were also used as taxis or fleet cars, which means some transmissions are simply worn out.
Common symptoms
- Slipping gears
- Harsh shifting
- Delayed engagement
- Transmission shudder
- Fluid leaks
A healthy VT auto should shift smoothly without clunks or hesitation.
Related guide
- VT, VX, VY Commodore Transmission Problems
- VT, VX, VY Transmission Service Guide
- Best Transmission Fluids for Holden Commodores
3. Cooling System Problems
Cooling systems are one of the biggest weak points in ageing VT Commodores.
Radiators, heater hoses, thermostat housings and water pumps all become vulnerable with age. Many original components are now decades old.
Overheating an Ecotec or LS1-powered VT can quickly turn into a very expensive mistake.
Common symptoms
- Coolant leaks
- Rising temperature gauge
- Overheating in traffic
- Heater not working properly
- Sweet coolant smell
Preventative cooling system maintenance is one of the smartest things you can do on a VT.
Related guide
- Ecotec Commodore Cooling System Problems
- VT, VX, VY Radiator Replacement Guide
- Best Radiators for VT, VX, VY Commodores
4. Front Suspension Wear
The VT introduced a more advanced suspension setup than previous Commodores, but worn front-end components are now extremely common.
Control arm bushes, ball joints and sway bar links wear out after years on rough Australian roads.
Lowered cars usually suffer even worse.
Common symptoms
- Clunking noises
- Steering vibration
- Uneven tyre wear
- Loose steering feel
- Poor ride quality
A tired suspension setup can make a VT feel far older than it really is.
Related guide
- VT, VX Commodore Suspension Problems
- Best Suspension Upgrades for VT, VX Commodore
- VT, VX Lowering Guide
5. Electrical Problems & BCM Faults
Electrical gremlins become increasingly common as VT Commodores age.
The Body Control Module (BCM) can develop faults that affect:
- power windows
- central locking
- interior lights
- security systems
Poor earth connections and ageing wiring also create plenty of strange intermittent issues.
Common symptoms
- Random warning lights
- Windows not working
- Flat battery
- Remote locking issues
- Interior electronics failing intermittently
Sometimes a weak battery alone can cause a surprising number of electrical problems.
Related guide
- VT, VX Commodore Electrical Problems
- VT, VX BCM Fault Guide
- Best Scan Tools for Holden Owners
6. Power Steering Leaks
Power steering leaks are another classic VT Commodore issue.
Hoses harden over time, seals begin leaking, and steering racks eventually wear out.
Many owners first notice the problem after seeing red fluid spots on the driveway.
Common symptoms
- Heavy steering
- Whining pump noise
- Fluid leaks
- Groaning while turning
Ignoring low power steering fluid levels can quickly damage the pump.
Related guide
- VT, VX, VY, VZ Commodore Power Steering Problems
- VT, VX, VY, VZ Steering Rack Leak Guide
- Best Power Steering Fluids for Holden Commodores
7. Diff Whine & Driveline Noise
Rear-wheel-drive Commodores eventually develop driveline noise, and the VT is no exception.
Diff whine is especially common in:
- SS models
- HSV variants
- hard-driven V6s
- ex-burnout cars
Many cars also develop clunks in the driveline from worn bushes and mounts.
Common symptoms
- Whining during acceleration
- Clunk when selecting gears
- Vibrations at speed
- Diff oil leaks
Some mild noise is fairly normal in older Commodores, but loud whining usually indicates wear.
Related guide
- VT, VX, VY, VZ Commodore Differential Problems
- VT, VX, VY, VZ Tailshaft Vibration Guide
- Best Diff Oils for Holden Commodores
8. Sagging Roof Lining & Interior Wear
If the mechanicals haven’t fallen apart yet, the roof lining probably has.
Sagging roof lining is almost guaranteed on a VT Commodore after years sitting in the Australian sun.
Other common interior problems include:
- cracked plastics
- worn seat bolsters
- broken switches
- rattles and squeaks
A clean interior can completely change how a VT feels overall.
Common symptoms
- Roof fabric hanging down
- Loose trim pieces
- Interior rattles
- Faded plastics
The good news is that replacement trim parts are still widely available.
Related guide
- VT, VX, VY, VZ Commodore Roof Lining Repair Guide
- VT, VX, VY, VZ Interior Restoration Guide
- Best Interior Products for Holden Vehicles
Is the VT Commodore Reliable?
Despite the common issues, the VT Commodore remains a solid and durable Australian car when maintained properly.
The Ecotec V6 is famously tough, LS1-powered models still have huge enthusiast support, and parts are cheap almost everywhere in Australia.
Buy a well-maintained example and the VT c
VT VX VY VZ Commodore Repair Manual