Q: P0123 code 1999 Jeep Wrangler

asked by on

Jeep threw a p0123 code, so far we've replaced the ecu & throttle position sensor. It idles at normal 800 rpms but when coming to a stop it drops down real low & sometimes stalls out. We hooked a scanner up to it & says the throttle is at 100%

My car has 240000 miles.
My car has an automatic transmission.

Hi there - this may seem like a wild shot, but I wonder if your torque converter lock-up clutch is failing to release as you coast down, and the engine is having to fight it? I would think you would sense that the engine is under load when this occurs, but perhaps it is only partially disengaging. You have certainly done the logical things diagnosing the throttle. For further diagnostic assistance, I recommend a stalling inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, and give you an accurate assessment of damage and cost estimate for repairs.

Was this answer helpful?
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. P0123 code 1999 Jeep Wrangler

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: Q: Car shaking and making noise

You should have a cylinder contribution test and code scan performed to determine the cause of your problems. Malfunction of the ignition coils, mass air flow sensor, and timing chains are all common causes of the symptoms you described,...

Q: I'm having problems with code po740

Hi there. In order to be able to give you more exact information I would need to know whether or not the vehicle is equipped with the CVT transmission. It sounds like you have the regular transmission in your vehicle....

Q: Ford Ranger won't go into gear brand new slave cylinder installed

You may have air in the clutch hydraulic system and need to bleed out the air. When you jacked up the rear of your truck an air bubble must have gone down to the clutch slave cylinder and caused the...

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.