Contemplating Throttle Body Replacement
Hi, all. I own a 2008 Jeep Compass (automatic transmission) with about 53,000 miles on it. I'm thinking of replacing the throttle body because of some recent issues I've had, but I'd like to get a second opinion on it first before I spend money on something that might not solve my problem.
The problem I'm experiencing is similar to the one posted in this forum on Feb7 by hihosilver74 (the forums won't let me post links for some reason). A couple weeks ago, I started my engine after work, and the ETC light (red lightning bolt with two half circles) and the traction control light both lit up on my dash. I drove the car to the other side of the parking lot and turned off the engine. I waited a couple minutes, turned it on again, and the lights went away. I was able to drive home fine. Over the next two or three weeks, this same would happen again intermittently. At one point, I tried driving a short distance with the lights on, and my Compass wouldn't exceed 20MPH. Some websites I went to described this as "limp mode". I went to an auto-parts store and pulled the following codes: C121C (torque request signal denied), P2110 (throttle actuator control system forced limited RPM), P2112 (Throttle Actuator Plate stuck closed), P2111 (Throttle Actuator Plate stuck open). Additionally, my engine is idling at over 1000 RPMs when in park, the engine shakes a lot more than it used to, and it occasionally "jumps" a bit when it shifts gears. It's also noisier than it used to be at any speed, but I've noticed it's especially loud when idling or at a red light.
Based on what I read on the internet, I started to troubleshoot the problem by cleaning the throttle body. I removed it from the engine last week and cleaned it with throttle body cleaner even though it didn't seem like it was exceptionally dirty. Since then, I've not seen the two DTCs I mentioned above light up after starting the car, but the other symptoms are still present. Today, when I was driving home from work, the ETC light lit up for about a second, and the engine felt like it jumped a little. My guess is that the throttle was stuck open for a brief second.
At any rate, it seems like cleaning the throttle body didn't fix the problem. I'm leaning towards replacing it, but I'm not sure if there is something else I should check first. Specifically, I've heard that throttle position sensors can sometimes fail. I'm researching how to check those, but I'm not sure if that aligns with my symptoms or not. I've also heard that idle air intake can cause issues similar to my idling problem, but it doesn't match up with the codes I pulled at the auto store.
Does anyone have any advice, suggestions, or past experience related to this?