Parts for your 2017 Holden Colorado-Camshaft sensor

2017 Holden Colorado Camshaft Sensor — What it does and when to replace it

Based on GM Service Information for the RG Colorado MY17 (2.8‑litre Duramax LWN) and Holden/ACDelco parts catalogues, the 2017 Holden Colorado is fitted with a camshaft position sensor (CMP). These sources also reference related DTCs such as P0340 and P0341 for this model, confirming the sensor’s relevance.

On the 2017 Colorado, the camshaft sensor works with the crank sensor to tell the ECU exactly where the engine is in its cycle. That timing info is crucial for precise diesel injection, smooth starts, good fuel economy and keeping emissions gear like EGR and turbo control behaving. If the CMP signal goes missing or messy, the ute can be hard to start, stumble off idle, drop into limp mode, or light the MIL.

There’s no scheduled replacement for the camshaft sensor in normal servicing. It’s a “replace on fault” part. Still, it pays to keep an eye on a few basics when the bonnet’s up: make sure the wiring harness isn’t rubbing on the cam cover, the connector is clean and clipped firmly, and there’s no oil weeping into the plug. Fresh oil and regular filter changes help keep magnetic debris at bay, which is good news for any Hall‑effect sensor living near the valvetrain.

Common warning signs include:

• Hard starting, long crank or stalling
• Rough idle or flat spots on acceleration
• Check engine light with codes like P0340/P0341
• Reduced power/limp mode

Replacement is usually straightforward for a competent DIYer, though access can be a bit tight on the cylinder head area. Expect about 0.3–0.6 hr labour in a workshop. Typical steps: disconnect the battery, unplug the connector, remove the retaining bolt, withdraw the sensor, swap the O‑ring (lightly oil it), refit and torque to spec, reconnect and clear codes. Use quality OEM‑equivalent parts, don’t force the connector, and always install the new O‑ring to prevent leaks. After replacement, clear any stored faults and let the ECU relearn—often it sorts itself after a short drive cycle, a scan tool just speeds the process and confirms live data looks happy.

If faults persist after fitting a new sensor, check the crank sensor, harness integrity, and ECU grounds, as the CMP and CKP signals work as a pair for phasing on the Colorado’s 2.8‑litre diesel.

Where is the camshaft sensor on a 2017 Holden Colorado?

It’s mounted on the cylinder head/rocker cover area, positioned to read camshaft rotation. Exact placement varies slightly by build, but look along the top side of the head near the cam cover with a small two‑ or three‑pin connector. A torch and a slim 10 mm socket usually do the trick.

Can a bad camshaft sensor cause a no‑start?

Yes. The ECU needs an accurate cam signal for fuel phasing, particularly on cold start. If the sensor fails completely or the wiring is open‑circuit, you may get extended cranking or a full no‑start with a check engine light.

Does a new camshaft sensor need programming?

Generally, no special coding is required. Clear the codes, and the ECU will relearn synchronisation during a short road test. A scan tool helps confirm the cam/crank correlation and that no fresh faults pop back up.