The code P1537 indicates that the intake manifold runner system is stuck open.
It is likely due to a faulty vacuum actuator for the runner system.
It could simply be a issue with the wiring as well.
I have attached the diagnostics for the code as well as replacement procedure for your reference.
Please let me know of any questions.
Images (Click to enlarge)
Friday, September 3rd, 2021 AT 1:46 PM