Parts for your 2002 Holden Commodore-Crank angle sensor

2002 Holden Commodore crank angle sensor — what it does and how to look after it

Yes, the 2002 Holden Commodore absolutely uses a crank angle sensor (also called a crankshaft position/CKP sensor). This is confirmed in the Holden Commodore VX/VY Service Manual (Engine Controls), which details CKP input for fuel and spark timing, GM Powertrain documentation for the 3.8L Ecotec (3800 Series II) describing the 3x/18x crank sensor at the harmonic balancer, and GM Gen III/LS1 service information noting the CKP sensor at the rear of the block near the starter. So it’s a key bit of kit on both the V6 and LS1 V8 variants.

On the 2002 Commodore, the crank angle sensor feeds the ECU the exact crank position and speed so it can fire the coils and injectors right on cue. If that signal goes walkabout, the engine can misfire, stall, or refuse to start. On the Ecotec V6, the sensor sits behind the harmonic balancer, on the LS1 V8 it’s mounted in the block by the starter.

It’s not a scheduled service item, but it’s smart to keep an eye on it during routine checks. Look for perished wiring near the balancer, oil contamination, or damaged connectors. Typical symptoms of a failing sensor include hot stalling, long crank/no start, rough running, and a dead tacho while cranking. The ECU often logs fault codes such as P0335 or P0336.

• Replacement notes (V6 Ecotec): the balancer must come off with the correct puller, set the sensor air gap per spec, route the harness clear of the pulley, and torque everything to factory values.
• Replacement notes (LS1 V8): usually requires removing the starter to access the sensor, inspect the harness for heat damage and clip it back correctly.
• After replacement: many cars need a crank variation learn (CASE relearn) with a proper scan tool (e.g., Tech 2) so the ECU can sync to the new signal. Skipping this can leave a miss or persistent codes.

Practical servicing tip: if chasing intermittent stalling on a V6 Commodore, check the crank sensor and balancer first — heat soak failures are common. Keep the front seal dry and the balancer true, oil leaks and wobble can quickly upset the sensor signal. With a good-quality replacement sensor and the relearn performed, the Commodore’s idle and starting manners usually come right.

Popular questions about the 2002 Holden Commodore crank angle sensor

Where is the crank angle sensor on a 2002 Commodore?
On the 3.8L Ecotec V6 it’s mounted behind the harmonic balancer at the front of the engine. On the 5.7L LS1 V8 it’s fitted in the rear of the block near the starter motor. Access differs: V6 needs the balancer pulled, LS1 typically needs the starter out of the way.

Do I need a relearn after replacing the sensor?
Often, yes. A crankshaft variation learn (CASE relearn) using a suitable scan tool lets the ECU map the new signal correctly. Without it, you might see codes like P0335/P0336 or feel a slight miss under load.

What are the signs my Commodore’s crank sensor is failing?
Common clues include hot-stall then no-start until it cools, an erratic or dead tacho while cranking, extended cranking, and stored CKP-related fault codes. Wiring heat damage or oil contamination around the sensor area can accelerate failure.