Commodore (VN-VZ) / HSV

1988-2006 / Sedan / Estate / Australia

All Commodore (VN-VZ) / HSV problems All workshop issues

Common Transmission

4L60-E Automatic Issues

Symptoms

Harsh 1-2 shift, delayed engagement from Park to Drive, slipping under hard acceleration, shudder during torque converter lockup.

Cause

The 4L60-E is a hydraulically controlled (VN-VS) or electronically controlled (VT-VZ) 4-speed automatic. The 3-4 clutch pack and the torque converter clutch are the primary wear items. Contaminated fluid, infrequent service, and high-power applications accelerate wear.

Fix

Service the transmission (fluid and filter) every 40,000 km.

If the transmission is already showing symptoms, a shift kit ($200-400 fitted) can extend life.

A full rebuild costs $1,500-3,000.

For high-power applications (modified LS1/LS2), the 4L60-E is marginal, consider a 4L80-E swap or a built 4L60-E with upgraded internals.

Cost mentioned in fix

$200-400$1,500-3,000

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Other known issues

Common Transmission

Manual Gearbox Synchro Wear

Grinding or crunching when shifting into 2nd or 3rd gear, especially on cold mornings or when shifting quickly.

Common Engine, V6 (Buick/Ecotec 3.8L, VN-VY)

Intake Manifold Gasket Leak

Coolant leak at the junction of the intake manifold and cylinder heads. May present as coolant loss without a visible external leak (coolant enters the intake ports), or as a coolant stain on the side of the engine. Engine may run rough or misfire if coolant enters the combustion chamber.

Critical Engine, V6 (Buick/Ecotec 3.8L, VN-VY)

Harmonic Balancer Failure (Ecotec, VS onwards)

A wobbling pulley on the front of the crankshaft. Knocking or rattling noise from the front of the engine. The drive belt may track poorly or come off.

Common Engine, V6 (Buick/Ecotec 3.8L, VN-VY)

Supercharger Bypass Valve Failure (L67 supercharged V6)

Loss of boost, rattling from the supercharger, reduced performance. The supercharger may make a whining noise that changes with the valve's operation.

Critical Engine, V6 (Alloytec 3.6L, VZ)

Timing Chain and Guide Failure

Rattling noise on cold start that may persist after warm-up. Check engine light with codes related to camshaft timing. Rough idle, misfiring, loss of power. In severe cases, the engine won't start or runs extremely poorly.

Critical Engine, V6 (Alloytec 3.6L, VZ)

Oil Leaks from Timing Cover

Oil weeping or dripping from the front of the engine, behind the harmonic balancer area.

View all 20 Commodore (VN-VZ) / HSV problems