Experiencing issues with your Mazda CX-30 push button start can be frustrating, especially when it seems to stem from a simple key fob battery problem. Many Mazda CX-30 owners may encounter a situation where their vehicle displays a “key not detected” message, leading them to suspect the key fob battery. While a low key fob battery can indeed cause such alerts, it’s not always the root of the problem, and sometimes, even replacing the battery doesn’t resolve the issue. This article explores a real-world scenario faced by a Mazda CX-30 owner and delves into the troubleshooting steps taken to diagnose a perplexing starting problem.
Initially, encountering a “key not detected” message on a Mazda CX-30 dashboard often points towards a depleted key fob battery. Following this common intuition, the owner of a 2022 Mazda CX-30, with 33,000km on the odometer, replaced their key fob battery after noticing this warning. However, the problem persisted and even escalated. The next day, the car unlocked using the key fob, but the mirrors failed to unfold, a usual confirmation sign. More critically, attempting to start the vehicle resulted in a “Push button start malfunction” error message, with no engine response whatsoever – no relay clicks, no starter motor engagement, nothing. This occurred with both the primary and spare key fobs, ruling out a simple key fob issue.
Suspecting a broader battery problem, the owner then investigated the car’s main battery. Online research suggested that a weak car battery could trigger similar “push button start malfunction” errors. Employing a car battery charger and tester, they found the original battery’s health at a concerning 43%. Consequently, a brand-new battery, tested and confirmed to be at 100% charge and 106% state of health, was installed. Unfortunately, this replacement yielded no improvement; the same “Push button start malfunction” error persisted, indicating a deeper underlying issue beyond just the car battery itself.
To further diagnose the problem, an OBDII sensor was utilized to read Diagnostic Trouble Codes (DTCs). This revealed a “P0560(16) System voltage – malfunction” error within the Body Control Module (BCM). While this code could initially be attributed to the old, weaker battery, clearing the code and re-testing after installing the new battery still showed the same P0560 error alongside the persistent starting problem. This pointed away from a simple battery issue and towards a potential system voltage problem even with a new battery in place.
Finally, a meticulous check of both the under-hood and footwell fuse boxes was conducted, but no blown fuses were identified. Despite addressing the initial suspicion of a key fob battery issue and subsequently replacing the car battery, the Mazda CX-30 continued to exhibit the “Push button start malfunction” error and the “P0560 System voltage malfunction” DTC. This scenario highlights that while “key not detected” messages can often be related to a low Mazda CX-30 key fob battery, a more complex electrical or system voltage problem might be at play when these initial steps fail to resolve the starting issue. Further investigation beyond the key fob and car battery is clearly needed in such cases to pinpoint the exact cause of the “Push button start malfunction”.
