Skip the auto shop - Our mechanics make house calls

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 1000 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: I am trying to locate the headlight adjuster for my pickup but I can't find it

There is an adjuster on the outside, near the top of light. You may have to remove the trim panel to get to it. The other is located behind the light on the inside. It is on a long rod...

Q: Why is my car idling high at an RPM of 1200?

This may be caused by a dirty or failing idle air control valve/module. As you may know, this is a unit that monitors the air intake as it is mixed with fuel prior to being injected into the engine. When...

Q: Car shuddering

When the vehicle stability assistance (VSA) control module detects wheel spin, it sends a request to the modulator unit to apply brake pressure to slow the spinning wheel. At the same time, it sends a signal to the traction control...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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 Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...