Amarok ECU Fault Memory Lock Causing Engine Issues

I had a similar issue with a 2013 VW Tiguan. As someone with moderate experience in car electronics and ECU diagnostics, I can share what worked in my case. The persistent fault codes and memory lock turned out to be related to an undervoltage condition in the vehicle electrical system. The workshop discovered this after running comprehensive ECU diagnostics. Like your case, basic fault code clearing attempts failed repeatedly. The repair involved: 1. Full system voltage check 2. Testing the battery management module 3. Reprogramming the ECU after fixing the voltage issue 4. Complete reset of all control modules Total cost was 240€ for diagnostics and repair work. After fixing the underlying voltage problem, the fault memory cleared properly and the check engine light stayed off. Before suggesting more specific solutions, could you share: Current battery voltage readings, Complete list of stored fault codes, Whether issues started suddenly or developed gradually, Any recent electrical work or battery changes This information would help determine if your auto repair needs match what I experienced. The locked fault memory often points to deeper electrical system issues rather than just ECU problems.

Last service was just 300km ago where they did a full inspection, and my control unit is showing constant voltage readings of 14.2V. The main fault codes I am getting are P0106 and P0507. Definitely started after I had the alternator replaced at an independent garage about 2 weeks back. Battery is reading fine at 12.6V when tested. The workshop data shows the ECU is registering abnormal readings from the MAP sensor and idle control, but physically these components look fine. Just wondering if this could be related to incorrect programming after the alternator work rather than actual component failure. Worth mentioning that the electronic throttle response feels inconsistent since these codes appeared. Makes me think there could be a connection between the new alternator installation and current ECU fault patterns.

Thanks for those details about your Amarok. Had exactly the same alternator replacement scenario on mine and similarly ended up with persistent fault codes. Your voltage readings of 14.2V while running and 12.6V at rest are actually spot on, which suggests the new alternator is functioning correctly. However, the P0106 and P0507 codes appearing right after the alternator swap matches my experience, these ECU fault patterns are typical when the car computer system needs recalibration after major electrical work. In my case, the ECU diagnostics revealed the computer system needed a specific relearn procedure after the alternator replacement. The MAP sensor and idle control issues were just symptoms of the ECU running on mismatched parameters. The memory lock was preventing normal clearing because the system detected these mismatches. What fixed it for me: 1. Full ECU reset using professional diagnostic equipment 2. MAP sensor calibration 3. Idle relearn procedure 4. Throttle position sensor adaptation The erratic throttle response you mentioned is another classic sign that the ECU needs readaptation rather than new parts. Would suggest having a specialist workshop perform a complete computer system readaptation rather than just trying to clear codes.

I appreciate the detailed explanation about the ECU readaptation process. The connection between the alternator replacement and these specific fault codes makes a lot of sense now. Since my voltage readings match what you experienced, I will definitely look into getting the full ECU reset and relearn procedures done. The active memory lock and persistent codes seem more like a calibration issue than faulty components, especially given the timing after the alternator work. I will contact a workshop that specializes in control unit programming and ECU diagnostics. The throttle response issues and fault codes should hopefully resolve once the computer system is properly readapted to the new alternator parameters. Much better than replacing sensors that are likely working fine. Will update once I get the relearn procedures done. Based on your experience, this seems like the most logical next step rather than continuing to chase potential component failures. Good to know the voltage readings are normal, that was one of my main concerns with the new alternator installation.