A 2009 Volkswagen Tiguan exhibiting a no-start condition was diagnosed using VCDS (Vag-Com Diagnostic System). The primary concern is identifying the root cause behind the engine’s failure to start, focusing on the specific fault code related to the camshaft and engine speed sensors. This article details the diagnostic process, including the complete VCDS Auto-Scan and relevant fault codes, to guide troubleshooting efforts.
Understanding the Problem: No-Start with P0016 Code
The Tiguan in question is a stock vehicle with approximately 114,897 miles (184,910 km). Recent repairs include a water pump replacement in April 2019 and intake manifold replacement in December 2018. All parts used were OEM. The vehicle is out of warranty. The immediate issue is a no-start condition accompanied by a specific fault code identified by the VCDS scan:
000022 - Bank 1: CMP Sensor (G40) / Engine Speed Sensor (G28) P0016 - 000 - Incorrect Correlation - Intermittent - MIL ONThis code (P0016) indicates an incorrect correlation between the camshaft position sensor (G40) and the engine speed sensor (G28) on Bank 1. This misalignment can prevent the engine from starting as the engine control unit (ECU) cannot accurately determine the engine’s position for proper fuel injection and ignition timing.
Initial Assessment and Diagnostic Steps
Initial checks confirmed a good battery connection. However, fuses and relays haven’t been thoroughly inspected yet. While the owner possesses a strong mechanical background, familiarity with VW systems is limited. A compression test has not been performed. Visual inspection of the ignition coils revealed no oil contamination. The camshaft position sensor connection appears intact without visible wire damage. Internal engine inspection for foreign object debris (FOD) hasn’t been conducted.
The next logical steps involve a systematic approach:
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Electrical System Verification: Thoroughly check all fuses and relays related to the engine management system, focusing on those associated with the camshaft and crankshaft position sensors. Inspect wiring harnesses for damage, shorts, or open circuits.
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Sensor Testing: Test the camshaft and crankshaft position sensors using a multimeter or oscilloscope to ensure they are functioning within specifications. This includes checking for proper signal voltage and waveform.
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Timing Chain Inspection: The P0016 code can also indicate a problem with the timing chain. While less likely given the recent intake manifold replacement, it’s crucial to verify proper timing chain alignment. This may require specialized tools.
Conclusion and Next Steps
The P0016 fault code points towards a potential issue with the camshaft and/or crankshaft position sensors, their wiring, or less likely, the timing chain. A systematic diagnostic approach focusing on electrical system verification and sensor testing is recommended. Depending on the diagnostic findings and the complexity of the required repairs, the owner will proceed with either DIY repair or consider selling the vehicle for parts. Access to VW Tiguan technical documentation and schematic reading skills will aid in the troubleshooting process.
