Parts for your 2019 Holden Colorado-Map sensor

2019 Holden Colorado MAP sensor — purpose, service and replacement

Technical sources confirm a MAP sensor is fitted and absolutely relevant on the 2019 Holden Colorado (RG, 2.8L Duramax diesel). These include the Holden RG Colorado MY2019 Service Manual (Engine Controls — Diesel), GM Global Service Information covering DTCs P0106/P0107/P0108 for the MAP circuit, the ACDelco/GM Genuine Parts catalogue listing a “Sensor, Manifold Absolute Pressure” for 2012–2020 Colorado/Trailblazer, and Bosch TMAP sensor documentation used in GM diesel intake systems. On this ute, the MAP (often a TMAP that also reads intake air temperature) sits in the intake manifold or charge tract and feeds the ECU real-time boost and air density data.

The MAP sensor’s job is to report manifold absolute pressure so the ECU can juggle fueling, turbo boost, EGR flow and DPF management. Accurate pressure readings mean crisp throttle response, strong towing torque and tidy fuel economy. On a turbo-diesel like the Colorado’s 2.8, the MAP is also key for boost control and safeguarding the engine under heavy loads.

While there’s no fixed replacement interval, the MAP sensor benefits from periodic inspection, especially for vehicles that tow, tour or see dusty outback tracks. Oil mist and soot from EGR can film over the sensing port and skew readings, leading to rough running or limp mode. A quick clean with a sensor-safe cleaner (never brake/carb cleaner) during routine services every 20,000–30,000 km can keep it honest. If the sensor throws codes (e.g., P0106, P0107, P0108, P2227), reads oddly (e.g., not ~100 kPa KOEO at sea level), or the ute feels flat and smoky, testing or replacement is on the cards.

• Common symptoms: sluggish acceleration, poor economy, surging, hard starts, black smoke, or boost-related fault codes.
• Quick checks: look for split boost hoses, clogged intercooler, fouling on the sensor tip, brittle wiring, and a nicked O-ring.

Replacement is straightforward: pop the bonnet, unplug the connector, remove the retaining fastener, lift out the sensor, lightly oil the new O-ring, refit and torque the screw, then reconnect. Clear any codes and verify live data with a scan tool, most ECUs don’t need special calibration after a MAP swap. If in doubt, let a qualified tech handle it — especially if the vehicle’s modified or tuned.

Many RG Colorados run both a MAF and a MAP, even so, the MAP remains critical for boost and EGR control. Keeping it clean and leak-free is cheap insurance for reliable, torquey performance across Aussie and Kiwi conditions.

Popular questions

Where is the MAP sensor on a 2019 Holden Colorado?
The sensor is typically mounted on the intake manifold near the top, or on the charge pipe just before the manifold on some variants. It’s a small plug-in sensor with a single retaining bolt and a multi-pin connector. Some models have both a manifold-mounted TMAP and an additional pressure sensor in the charge tract.

How often should the MAP sensor be cleaned or replaced?
There’s no set replacement interval. Inspect and, if needed, clean it every 20,000–30,000 km or annually, especially if the ute works in dusty or sooty conditions. Replace the sensor if it logs MAP/boost DTCs, shows implausible readings, or cleaning doesn’t restore normal operation.

Does the 2019 Colorado use both a MAF and a MAP sensor?
Yes, many 2.8L Duramax RG variants use both. The MAF measures incoming airflow at the airbox, while the MAP reads pressure in the manifold/charge tract. The ECU uses both data streams for precise fueling, boost and EGR control, the MAP remains essential for turbo-diesel management.