03-31-2022, 10:21 AM | #1 |
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Rep 18
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N55 Valvetronic Issues
Hey guys. Got a 2016 BMW M235i (N55) here, low on power/throttle response.
Getting error code: "135808 - Valvetronic servomotor position sensors, electrical, open circuit, shortcircuit: Malfunction". Followed the test plan in ISTA+ which suggested to check and replace the servomotor and/or wiring harness. So far I've replaced the servomotor (which has the built in hall effect position sensors) and checked continuity of wiring harness back to DME (pin 1 to pin 1, pin 2 to pin 2, and so on, as well as pin 1 to pin 2, pin 1 to pin 3, and so on - so I'm fairly confident there are no breaks or cross-wire shorts inside the harness) - but still getting this error. No signs of water/oil ingress to harness. Eccentric shaft seemed to move smoothly and easily when I replaced the servo motor. Suspecting a faulty DME, but this is a big expense to follow through on a hunch. Not sure how much further I can take my troubleshooting before concluding? |
09-29-2023, 12:44 PM | #3 | |
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When the car is cold it has no problems until it warms up then the code pops. I can do the 20 minute relearn process but it fails around 250 cycles or so. Thanks |
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