27C0

What the Code Means

Code 27C0 points to a faulty exhaust camshaft position sensor on bank 2 (cylinder bank 2). This sensor is part of the VANOS (Variable Nockenwellen Steuerung) system and determines the exact position of the exhaust camshaft for camshaft timing control. A failed sensor disrupts VANOS operation, which affects engine performance and idle quality.

VANOS adjusts the timing of the intake and exhaust camshafts to optimize power, torque, and emissions. The camshaft position sensor sends its signal to the DME (Digital Motor Electronics), which uses that data to control the VANOS oil valves. With fault 27C0 stored, the DME can't determine the exhaust camshaft position on bank 2, so VANOS drops into a fail-safe mode.

Symptoms

• Loss of engine power, especially at mid and high rpm
• Rough idle, with possible hesitation and jerking
• Check Engine light (MIL) on the instrument cluster
• Hard starting or unstable engine operation

Diagnosis and Repair

Step 1: Check the Sensor and Wiring

• Visually inspect the sensor connector and wiring for damage, corrosion, or oil contamination.
• Use a multimeter to check sensor resistance and circuit continuity from the DME to the sensor.
• A diagnostic scanner (ISTA or INPA) is recommended to check the sensor signal in real time.

Step 2: Replace the Sensor

• If the sensor is faulty, replace it with an original OEM sensor (part number 11361433773).
• Make sure the sensor is installed correctly and torqued to spec.

Step 3: Check the Timing Chain and VANOS

• After replacing the sensor, inspect the timing chain and VANOS mechanism for wear or contamination.
• If needed, run the VANOS adaptation with diagnostic equipment.

Secondary Problems

Ignoring fault 27C0 can leave VANOS running incorrectly, which over time causes uneven wear on the timing chain and camshaft sprockets. In severe cases the timing chain can jump, leading to major engine damage (piston-to-valve contact). Repair costs climb fast if you ignore it — from a sensor replacement to an engine rebuild.