Parts for your 2020 Holden Commodore-Camshaft sensor

2020 Holden Commodore Camshaft Sensor

Technical sources confirm the 2020 Holden Commodore (ZB) uses a camshaft position sensor. GM Service Information (SI) for the ZB Commodore (2018–2020) lists Camshaft Position Sensor Description/Operation and Replacement procedures for the 2.0‑litre turbo petrol and the 3.6‑litre V6. The Opel Insignia B workshop manual (the Commodore’s European twin) documents the same systems, and the factory DTC charts include P0340/P0341 camshaft sensor faults. Holden/ACDelco parts catalogues also show camshaft sensors for these engines. So yes — it’s fitted and it matters.

On the 2020 Commodore, the camshaft sensor tells the engine control module exactly where the cam(s) are in their rotation. That lets the ECM fire the injectors in sequence, sync spark timing, and command the variable valve timing (VVT) phasers. The result is easy starts, smooth idle, decent fuel economy and proper grunt when asked. If that signal goes missing or messy, the car can be hard to start, run rough, drop into limp mode, or light the check engine lamp.

It’s not a routine service item, but it’s wise to keep it happy. Use the correct oil spec (dexos-approved) and change it on time, clean oil helps VVT and keeps metal debris away from the sensor’s magnetic face. Under the bonnet, check the sensor connector for oil intrusion or brittle wiring, especially on high‑kilometre cars in Aussie and Kiwi heat. If a fault pops up, scan for codes like P0340/P0341 and inspect wiring before blaming the sensor.

Replacement is straightforward with the right access and a bit of patience. On the 2.0T, the sensor sits at the top/front of the cylinder head near the timing cover. On the 3.6 V6, there are multiple sensors on the front and rear of the heads (intake and exhaust cams), so rear-bank access can take longer. Typical workshop time ranges from about 0.5–1.0 hour for the 2.0T to 1.0–1.5 hours for a rear-bank V6 sensor. Always fit quality OE‑spec parts, clear codes, and perform a cam/crank correlation relearn with a scan tool where specified in GM SI. If the light returns, check harness routing and VVT operation — the sensor often reports a problem it didn’t cause.

• Common symptoms: long crank, misfires or rough idle, poor fuel economy, sudden loss of power, MIL on with cam/crank codes.

Popular questions about 2020 Holden Commodore camshaft sensors

Does every 2020 Commodore engine have a camshaft sensor?
Yes. Both the 2.0‑litre turbo petrol and the 3.6‑litre V6 in the ZB Commodore rely on camshaft sensing for sequential injection and VVT control. GM SI and the Opel/Insignia workshop data include diagnostic and replacement steps for these sensors across the range.

How can someone tell if their Commodore’s camshaft sensor is failing?
Typical signs include longer cranking, stumbling idle, flat spots, and the check engine light. Scan for codes like P0340 or P0341. Always inspect the connector and wiring, and confirm oil quality is up to spec before replacing the sensor.

Is a camshaft sensor a regular service replacement?
No. It’s replaced on condition. Good oil, tidy wiring, and correct harness routing go a long way. If replacement is needed, use OE‑quality parts and carry out the relearn procedure so the ECM syncs correctly.