2018 CX-5 Experiences drop in RPM at low speeds

I own a 2018 Mazda CX-5 2.5L AWD and have been experiencing a specific issue where the vehicle "jerks" or experiences a drop in RPMs at low speeds. When the engine reaches around 1200 RPM, it drops approximately 200 RPMs without switching gears, resulting in a noticeable jolt. This issue occurs at any speed when switching to manual mode. I have ruled out several potential causes, including spark plugs, the fuel system, sensors, software issues, ECU errors, and transmission fluid.

Additionally, the following actions have been taken:
  • Replaced spark plugs
  • Changed transmission fluid
  • Cleaned the throttle body
  • Checked for ignition misfires
  • Updated the ECU software
Despite these measures, the problem persists. I am seeking further diagnosis and a potential solution to this issue.
 
Look up the Transmission relearn procedure. It's somewhere on this forum. Set it back to factory specs and go from there.
 
Its the Oxygen sensor. Get it clean up or replace problem solved.
Mazda CX 5 Oxygen O2 Sensor Maintenance Cleaning. LOW IDLE Issue FIX.
 
I own a 2018 Mazda CX-5 2.5L AWD and have been experiencing a specific issue where the vehicle "jerks" or experiences a drop in RPMs at low speeds. When the engine reaches around 1200 RPM, it drops approximately 200 RPMs without switching gears, resulting in a noticeable jolt. This issue occurs at any speed when switching to manual mode. I have ruled out several potential causes, including spark plugs, the fuel system, sensors, software issues, ECU errors, and transmission fluid.

Additionally, the following actions have been taken:
  • Replaced spark plugs
  • Changed transmission fluid
  • Cleaned the throttle body
  • Checked for ignition misfires
  • Updated the ECU software
Despite these measures, the problem persists. I am seeking further diagnosis and a potential solution to this issue.

With that drop of 200 rpms it kinda sounds like when the torque converter locks up. My CX does this but without the jolt.

I see that the trans fluid was changed, how was the level set and was Mazda FZ used?
 
It is especially noticeable in the Miata. In that car it occurs at ~2300 RPM and drops by ~300 RPM, sometimes producing a jerk. The CX-5 does it but it's less noticeable.
 
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It is especially noticeable in the Miata. In that car it occurs at ~2300 RPM and drops by ~300 RPM, producing a jerk. The CX-5 does it but it's less noticeable.

Is your MX an automatic?
 
WTF? (Why the Face?)

I'm just messing with him; I don't care if he has an auto or not.

BUT, for me. The MX is a lightweight sports car that's all about fun and fun means shifting gears. I just love rowing through the gears when getting onto a highway or coming out of a tight corner. There's nothing like that feeling, except, on my motorcycle which also has a 6-speed manual. :D
 
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I'm just messing with him; I don't care if he has an auto or not.

BUT, for me. The MX is a lightweight sports car that's all about fun and fun means shifting gears. I just love rowing threw the gears when getting onto a highway or coming out of a tight corner. There's nothing like that feeling, except, on my motorcycle which also has a 6-speed manual. :D
I like the 6MT, the only six speed I've had. My cycle has a 5-sp.
 
Instead of RPM check the speed of vehicle, as my clutch in Automatic always release when dropping down from speed to 11~12MPH (18~20KMH). It also create a minor jerk when it does (very annoying).
 
With that drop of 200 rpms it kinda sounds like when the torque converter locks up. My CX does this but without the jolt.

This. Considering that it happens in manual mode (Which changes converter lock-up behavior) That would confirm to me, it is the torque converter, and there is nothing wrong with OP's car.
 

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