Parts for your 2012 Holden Barina-Camshaft sensor

2012 Holden Barina camshaft sensor — fitment, purpose, and service tips

Based on technical sources, the 2012 Holden Barina (TM series) is fitted with a camshaft position sensor on all factory engines offered in Australia and New Zealand, including the 1.6‑litre DOHC petrol and the 1.4‑litre turbo. The engine control module relies on this sensor for accurate timing, sequential fuel injection, and variable valve timing. Faults typically log diagnostic trouble codes such as P0340 or P0341 and may trigger reduced performance modes.

• GM Global Service Information (SI), Holden Barina TM 2012, Engine Controls – Camshaft Position Sensor: Description and Operation
• Holden Barina TM (2011–2018) Workshop Manual, Engine Mechanical and EFI Diagnostics
• ACDelco/GM Genuine Parts Catalogue, Holden Barina TM (1.6L and 1.4L turbo) – Camshaft Position Sensor listings
• Chevrolet Sonic/Aveo T300 Service Manual (mechanically equivalent to Barina TM) – CMP sensor diagnostics and replacement
• Major AU/NZ parts catalogues (e.g., Repco, Supercheap Auto) listing a camshaft position sensor for 2012 Holden Barina TM

The camshaft sensor on a 2012 Holden Barina tells the ECM exactly where the cam is in its rotation so it can sync fuel injection and ignition with the crank sensor. That precise timing helps the Barina fire up quickly, idle smoothly, and get decent fuel economy. It also lets the engine’s variable valve timing do its thing. When the sensor drops out, the ECM can only guess using the crank signal, so starts can be longer, power can feel flat, and the check engine light will usually pop on.

It’s not a scheduled service item, but it’s worth a look any time the rocker cover is off or the top of the engine is being serviced. Common issues are heat‑hardened wiring, oil wicking into the plug, or a perished O‑ring letting grime in. Keeping the connector clean, clips intact, and using the correct oil spec helps prevent deposit build‑up that can upset cam/crank correlation.

Replacement is pretty straightforward under the bonnet. Disconnect the battery negative, unplug the sensor at the cam cover, remove the single retaining bolt, and twist the old unit out. Lightly oil the new O‑ring, seat the sensor squarely, and nip the bolt to the manufacturer’s spec (don’t overtighten). Plug it back in, clear any fault codes, and take a short drive so the ECM can relearn synchronisation. Quality matters here—OE or reputable aftermarket (ACDelco/Delphi/Bosch as applicable) will save headaches caused by noisy signals.

If the Barina shows hard starting, rough idle, sudden stalling, or codes like P0340/P0341, scan it first and inspect the wiring and connector before condemning the sensor. Also keep an eye out for timing component wear—if correlation codes persist after a new sensor, it could be a stretched chain or worn actuator rather than the sensor itself.

• Where is the camshaft sensor on a 2012 Holden Barina?
  It’s mounted on the cylinder head at the timing end of the engine, near the cam cover. On both the 1.6 and 1.4T, it’s accessible from the top of the engine bay once the plastic engine cover is off. Look for a small two‑wire or three‑wire sensor with a single retaining bolt and a sealed O‑ring.
• What are the symptoms of a failing camshaft sensor on a Barina TM?
  Typical signs include long cranking, intermittent stalling, a flat spot on acceleration, poor fuel economy, and the check engine light with codes like P0340 or P0341. The ECM may drop into a safe strategy, so it’ll still run, but performance and refinement take a hit.
• Is it safe to drive with a faulty camshaft sensor?
  Short term, the car will usually run, but it can be hard to start and may lack power. Prolonged driving isn’t ideal—mis-timed events can stress other components and mask bigger issues. Best bet is to scan it, fix any wiring issues, and replace the sensor if confirmed faulty.