Encountering the P150a error code for the first time can be perplexing, especially when it surfaces immediately following an aftermarket remote start system installation. My initial experience with this issue began around July 23rd, although in hindsight, it might have occurred even earlier, coinciding with the start of the remote start kit installation the week before. While the keyless entry aspect wasn’t fully operational until mid-August, the P150A code emerged much sooner, prompting a deeper investigation into the potential causes related to the newly installed system.
This aftermarket remote start system introduced three key modifications to the vehicle’s existing setup, excluding the brake wire connection, which was implemented later on August 15th, and therefore unlikely to be the root cause of the initial P150A occurrences. These modifications include:
- OBDII Port Pass-Thru: The original OBDII port is connected to a pass-thru connector, which then occupies the original port’s position.
- Ignition Module Integration: An ignition module is inserted into a pass-thru, enabling the use of a large induction coil around the ignition slot for remote starting.
- CAN High/Low Pass-Thru: Both CAN High and CAN Low wires within the steering column are modified with a pass-thru connection to integrate with the remote start system.
The CAN High/Low modification immediately raises a flag. Both AliExpress and 12 Volt Solutions remote start options emphasize this CAN bus integration. Given that the Controller Area Network (CAN bus) is integral to vehicle diagnostics and error reporting, it seems a plausible area to investigate for the P150A fault. However, the remote start system’s main processing unit remains somewhat of a black box, lacking detailed documentation. Despite being designed for compatibility across various vehicles, the system’s 16 dip switch combinations suggest potential configuration complexities and opportunities for errors. There’s also a reset switch on the unit, which I briefly engaged, although its function appeared limited to aftermarket key fob programming.
Another area of concern lies in the “key sacrifice” method, where an existing car key is embedded within a box, wired to provide power and mimic the key’s functions. Initially, I damaged the PCB of the sacrificed key. However, to eliminate this as a variable, I replaced it with a known working key, ensuring the key itself wasn’t the source of the problem.
Among all the installation components, the OBDII pass-thru connector stood out for its questionable build quality. While the connection between this component and the P150A code’s emergence, or even broader issues like chain tensioners or engine timing, remains unclear at this stage, the low quality of this part is noteworthy. Perhaps this experience can serve as a cautionary tale for others venturing into similar aftermarket installations. Despite meticulous installation and double-checking all connections, the P150A code persists. The next step involves using VCDS (VAG-COM Diagnostic System) to reset the code and further investigate, coinciding with a scheduled visit to Porsche to address a pre-existing oil leak. This comprehensive approach will hopefully shed light on the root cause of the P150A error and ensure the reliable operation of the remote start system.
