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P21BB - How To Repair: Meaning, Causes, Symptoms, Fixes

P21BB - OBD2 Trouble Code P21BB Cold Start Cylinder 6 Injection Timing

P21BB Code Definition

P21BB Cold Start Cylinder 6 Injection Timing

What Does the Engine Code P21BB Mean?

Character "P" in the first position of Diagnostic Trouble Code (DTC) represents the powertrain system (engine and transmission), "2" in the second position means that this is a ISO/SAE controlled OBD-II (OBD2) DTC. "1" in the third character position in a DTC indicates that the fuel and air metering and auxiliary emission controls is experiencing a malfunction. The last two characters "BB" is DTC number. OBD2 Diagnostic Trouble Code P21BB means that Cold Start Cylinder 6 Injection Timing has been detected.

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How Serious Is the Code P21BB?

For now, this issue is not serious. Carly recommends you to check this issue on a regular basis and check if it gets worse later on.

*Every car is unique. The Carly Features that your car supports depend on the model, build year, hardware, and software in the car. Plug the scanner in the OBD2 port, connect to the app, run your first diagnostics, and check which features are available for your car. Also, keep in mind that any information provided on this website is for informational purposes only and should be used at your own risk. Mycarly.com is not responsible for any errors or omissions, or for the results stemming from the use of this information.

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