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Symptoms of a Bad or Failing AC Control Module
Common signs include inconsistent cooling, out-of-date software, and uneven air distribution, since the module controls the whole AC system.
How to Reset Your Check Engine Light
There are many warning lights that can illuminate on your dashboard. They can be indications of a pending failure in any number of your vehicle's systems. The Check Engine Light is...

Related questions

Question
My 4.0 engine that I had purchased before blew out and now I can't afford 4.0 engine. Could I replace the engine with small 3.3L, even if performances decrease?
Hi and thanks for contacting Your Mechanic. You can replace your vehicle with any engine size as long as the engine will bolt up to the transmission, the electrical harness will match the engine as it did on the 4.0L,...
Question
The code p0102 shows up after cleaning the mass air flow sensor.
Hi and thanks for contacting Your Mechanic. The wiring harness to the mass air flow sensor (MAF) could have a break in the wires. Disconnect your battery and remove the harness to the MAF and your computer. Use a digital...
Question
I cannot find a computer with the Part #. 1860A799. Can I use another part number that looks the same?
Hi there. The part number that you have is specific to your vehicle's computer system. If you are wanting to replace the computer with an aftermarket computer, you can but you will need the computer flashed (programmed) to the VIN...
Question
Bad computer in a jeep grand cherokee
I would not take anyone's word on the problem and look into it further. Find out why they did not get it replaced to sell the vehicle? If you decide you want to chance purchasing it then get pricing first...
Question
RPM gauge acts crazy, spark knocks, skip then shut down 2001 Hyundai Sonata
Hi - first task is to check problem codes, whether the Check Engine light is on or not. Given the symptoms you describe, this sounds like an electrical component, [ignition module](https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-electronic-spark-control, or engine management computer, that gets hot and fails...
Question
Engine swap with Ej20x, Ecu question
I will describe a scenario that will work and you can then judge your actual circumstances based on that. The initial issue is not the "country of origin" but rather whether the block and heads are identical, in every respect,...
Question
Misfire on my engine and I am getting an injector code 27. (OBD1)
Hi there. The injector output driver is not responding properly to the control signal. Check the wiring from the computer to the injector driver. If the noid light is flashing erratically, then the controller (computer) is not functioning correctly. You...
Question
Electrical issues with the gauges, interior lights, and rear wiper blade.
Hi there. When it comes to multiple systems and the electrical circuits malfunction, there is a power and ground issue. Check the battery cables and clean them with a tooth brush and baking soda with water. This will clean off...
Question
Blown fuse or computer system?
Since you shorted the electrical system, you may have damaged electrical components. The main fuses that power each and every circuit on the car may have been shorted and burned out. You should first check each and every fuse in...
Question
Reprogramming
Hello. Most vehicle interfaces offer multiple languages to suit their driver's needs. You may be able to set your vehicle's language by navigating through the system's menus to to access the settings. I would refer to the owner's manual to...
Question
Getting a p138b code - should I just replace the GPCM? I think a nearby lightning strike may be the culprit.
Hi there. If the codes for the engine are coming up with the glow plug control module failure, then check the module to see if there is any wiring burned or broken. If there is nothing wrong with the harness...
Question
OD2 scanner read trouble code P0101
Your computer may not be able to correctly interpret the data from the mass airflow sensor on your engine causing the P0101 code to keep returning. The manufacturer has a Technical Service Bulletin that came out January 30th of 2015....
Question
What's the difference between the ECM and PCM?
The engine control module (ECM) controls all the engine functions to keep it running correctly monitoring all the sensors of the engine. The power train control module (PCM) will include multiple control modules in one case called a PCM. The...
Question
I put a new computer (PCM) in the car and now it won't start.
Hi there. When you had the computer shipped to you, first thing to ask is if the computer was programmed to your vehicle. If the vehicle was no programmed, you will have to get it programmed at a dealership. If...
Question
I was told that my van needs a new brain thingy and a new serpintine belt. I am wondering if it is worth fixing up.
With the information you have given it would not be able to be determined if you would have any further problems after replacing the computer. Since the vehicle is over 16 years old and has over 220k miles there is...
Question
Rebuilt 350 engine rebuilt Quadrajet carburetor with new computer. Nothing will connect to the computer, which is effecting my transmission.
Hi there. Check the wiring to the carburetor and see if the choke is coming on or staying off. The computer controlled carburetors are designed to meter the choke and fuel jets. If the wiring to the carburetor has power...
Question
PO700 code is read on a code reader.
Hi there. The computer to the transmission (TCS) has failed and is not responding to any sensors and solenoids. When the TCS fails, it shuts off power to the transmission putting it into a limp mode as if the harness...
Question
My boy accidentally hooked battery cables up wrong on his truck, and now it's got white smoke that smell like gas coming out.
When hooking up the battery cables backwards, the ground became the hot and the hot became the ground. Most likely the computer (ECM) could have failed and the fuel pump may have burned up. I recommend checking all of the...
Question
Need help with key transmitter programming procedure.
When programming the transmitter, you need to have permission which the scan tool does not allow. This procedure will have to be done at a local dealership that has the scan tool with a login permission.
Question
door lock malfunction has occurred.
The body control module (BCM) can be replaced, but you will need to have it flashed (programmed) to match the VIN number on your vehicle. The dealership or manufacture are authorized to flash the new BCM. If you need further...

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