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I looked up more information about the code that the car threw back in December 2020 after stalling (which ended up clearing itself 2 days later). A scan at Autozone revealed P050B.
Someone in another group thinks it might not be ECU related but I may have boost/vacuum leak ... didn't think of that? Thoughts?
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Error Code P050B is defined as Cold Start Ignition Timing Performance. This code is a generic trouble code, meaning it applies to all vehicles equipped with OBD-II system or vehicles made since 1996 up to present. This includes vehicles from but not limited to BMW, Dodge, Ford, Jaguar, Jeep, Land Rover, Mazda, Mitsubishi, Volkswagen, etc. Specifications on the definition, troubleshooting, and performance, of course, vary from one make and model to another.
If the vehicle stores this code, that means the PCM (powertrain control module, also known as ECM or engine control module in other vehicle makes) has determined a problem in the vehicle’s ignition timing control system. The term ‘Cold Start’ is used to describe the engine’s drivability strategy that is used only when the engine at (or below) the ambient temperature.
OBD-II vehicles come with a distributor-less ignition system, thus the PCM is tasked to deliver a base timing strategy and to advance and retard ignition timing as required. Changes in engine load and RPM demand varying degrees of ignition timing to help optimize engine performance and maximize fuel efficiency.
To compensate for the lower combustion chamber temperature during cold season (when the engine is cold) timing is advanced slightly. In the event that the engine overheats or when knock sensors are activated, the ignition timing is retarded by the PCM to prevent engine damage.
If the PCM can no longer control the ignition timing, then the Error Code P050B will be stored, activating the Check Engine light. For most vehicles, it will require multiple ignition cycle failures to activate the Check Engine light.
Common Symptoms
Excessively rich exhaust
Engine stalls at idle
Pinging noise upon acceleration
Possible Causes
Severe vacuum leak
Defective ECT sensor
Open or shorted circuits or connectors
Bad CKP or CMP sensor
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