Q: Diagnostic reads 12 and 22. Jeep is idling at just over 1000 rpm (drives itself at 50km/hour.)

asked by on

using the home diagnostic check ie ... key turn 5 times, count how many times check engine light blinks gave us the following readings ... 12, 22, and 32 . have just replaced front oxygen sensor, jeep ran fine for a week or so now it is reading 12 and 22 on diagnostic. drives fine, then when engine is warm it idles high - foot off excellerator and it still drives at 50km/h. I believe the 12 is the battery being disconnected in last 50 key turns and the 22 means coolant sensor... would the coolant sensor cause the jeep to idle high when engine is warm ? it is unnerving especially in traffic ... can you offer any ideas , suggestions ??/
My car has an automatic transmission.

Hi there. Yes, the code 12 is for a battery disconnect to the PCM of the vehicle. The code 50 means that there is an error with the PCM. The code 26 means that there is an electrical input issue with the PCM. For the code 50 to come up, check the battery cables to ensure that they are tight and clean. Make sure that the harness to the computer is locked in and tight. For the code 26 and your engine idle high at cold conditions and then when warmed up it drops, this can be the coolant temperature sensor malfunctioning or the idle control valve (ICV) could be not working properly. Check the condition of both the coolant temperature sensor and the ICV and make sure that both are functioning correctly. Which ever one is not working, I recommend replacing it. If you need further assistance with your vehicle, then seek out a professional, such as one from Your Mechanic, to help you with your engine idle high issue.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Diagnostic reads 12 and 22. Jeep is idling at just over 1000 rpm (drives itself at 50km/hour.)

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: one wind sheild blade not going up or working

Hi there. This is usually a signal that the windshield wiper motor is damaged or that the wiper arm has stripped. In most cases, replacing the windshield wiper motor is the best way to resolve this issue. However, it might...

Q: Idler pulley for surpentene belt fell off

Hello. If the bolt is gone then it either broke or loosened. If it simply fell out then the bracket is fine. I usually check the bracket hole to make sure that the threads are still there. If the threads...

Q: Transmission issue

Hello and thank you for contacting YourMechanic. With the engine only revving up and the transmission is not moving in any direction forward or reverse, then there is a problem with the pump in the transmission. The transmission oil pump...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.