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OBD Diagnostic Codes
Most vehicles generate computer codes used for diagnosing simple and complex problems. These codes help service mechanics more efficiently locate and repair vehicle problems.
763 Questions
How do you pull up diagnostic codes on a 1991 Cadillac Sedan Deville?
push the off and warm buttons together on the climate control panel. Hold and release . Read codes
What does error code p0125 on a '99 ford explorer mean?
Trouble code P0125 means:Insufficent coolant temperature for closed loop fuel control
First thing, check your vacuum hoses. Second, unhook your battery for about an hour, then hook it back up. The computer may need to reset itself. After that, you're on your own.
- The most common vacuum hose issue with a focus is the PCV hose wher it goes to the back of the intake manifold. You should check that, but ususlly if you have a vacuum hose problem, it won't show up as a P0301 and a p0304 fail code, like you have. It will ususlly be a p0171 which is a lean code.
Since your fail codes are 301 and 304, you should actually check to see if you have ignition fire to the #1 and #4 cylinders. Evidentally you already checked that and didn't have fire, otherwise, I wouldn't think you would have replaced the coil pack, without doing that simple test. But in case you didn't, then you need to. If you have no fire to those two cyliders, and you are sure your plug wires are good, then likely there is something wrong in the PIP signal to the coil pack from the PCM. On the coil pack, there is a connector into the side with three wires. One is a shared PIP(pulsed ground signal) to the towers for cyls #1 and #4, one is a PIP to #2 and #3, and the third wire is a common power input. PIP is a pulsed ground from the PCM. The PCM pulses the ground "on" everytime it wants to fire either the #1/#4 cylinders, or the #2/#3 cylinders. So the #1 and the #4 plugs both fire at the same time, and so do the #2 and #3 plugs. The cylinder that isn't on it's compression stroke just receives a harmless "waste" spark.
If you DO have spark to these plugs, then you could have bad plugs. But if you DO NOT have bad plugs, then your problem IS NOT ignition. If your problem is not ignition, then you could have fuel injector issues or engine compression issues.
One thing is certain. When you find and fix the problem, you will know it. The engine will straighten up and run fine. No "resetting" of the PCM is necessary, other than to turn off the check engine light. "Reseting" the PCM does not fix problems. That is a common misconception.
You have what is referred to as a "misfire" evidentally on the numbers 1 and 4 cylinders. Four things cause a misfire: ignition failure(spark), fuel failure(lack of fuel), engine compression failure to those cylinders, or coolant getting into those two cyliders which is causing the fuel to not combust.
RECAP: Start with spark which is coil, plugs, or plug wires. If you don't have spark, find out why. Is it plugs, lug wires, or do you have no PIP signal on that circuit to those two coil towers.
Second, if spark is not your problem, then check engine compression. Get an engine compression guage and test all four cyliders. All will be around 150 PSI if they are good. Any cylinders that are under 100 PSI are a problem.
Third, make sure all four fuel injectors are firing.
Do those three thiings, and I'll bet somewhere along the line, you will find your problem.
Where is the obd connection on 1998 eclipse?
just under the dash on the drivers side near the center console.
What does error code ckp cmp correlation mean?
Significa qu el sensor no está emitiendo la posisión del cigueñal, es decir no produce la onda cuadrangular, en sintesis el CKP está defectuoso y no le está trasmitiendo señal al PCM.
I'm not understanding the code of 20, your 1997 Saturn has an OBDII computer. you need a code reader to get engine codes. you cannot pull codes manually by shorting terminals A-B anymore. every one of your engine codes is atleast 3 digits, and should start with P. for example: a faulty oxygen sensor with no responce will show a code of P0134, or a EGR with insufficient flow will show a code of P0401.
Answer
My code book shows that an OBDII code of P0020 is a camsharft position actuator circuit bank 2. you have a sensor problem or your cam chain has stretched beyond the tensioner's ability to remove slack. I was getting camshaft position errors and had to replace the cam chain and tensioner.
What is Error code p0303 on 2003 ford escape?
It is a cylinder misfiler on cylinder #3. Many times it is a defective coil-on-plug (COP) but not always
it looks like a multi plug right under the steering collum.under the dash covering
How do you fix obd codes 300pd 301pd302pd and 307pd on 1996 dodge 1500 v8?
Those are all misfire codes. The common cause would be spark plugs, wires, distributor cap, and rotor.
What is trouble code obd p0075?
Trouble code P0075 means:Intake valve control solenoid circuit (Bank 1)
What does the error code P0401 mean on a 2002 Ford Explorer?
Trouble code P0401 means: Exhaust Gas Recirculation Malfunction
What does error code E on myradio screen 2011 Honda crv?
You have attempted to enter the radio code too many times and the radio has locked up. To unlock it and then insert the correct security code just leave the radio on for 1 hour. The E will dissapear and it will show CODE. Enter the correct code to unlock the radio. If you do not know the code look in the glove box and under the coin tray. If it is not there then go to the Honda Owners website and register your Honda. There you can ge the code for free.
What does error code P0171 mean on a 1999 ford windstar?
Trouble code P0171 means: System too lean (bank 1)
What is obd code p0339 on a 2000 blazer?
Trouble code P0339 means: Crankshaft position sensor "A" circuit intermittent
OBD-2 error code on a 2000 infinity i30 is PO305. What is the problem?
There are three of them under the plate where you put the oil in. Because there are no spark plug wires you have to remove the modules in order to find the spark plugs. The other three are toward the back of the engine and not as easy to get to. You will be able to see the modules just becareful when you take the screws out it is easy to drop and loss them. The spark plugs are inside there and they are a pain to get to. In case your not sure the modules are small black squares that have a screw on either side of them.
Obd code p0300 engine will not start?
P0300 is multiple or random cylinder misfire. No start can be dead battery, failed starter, no fuel, no fuel pressure, computer or sensor malfunction, internal engine failure, etc.
It has different definitions for different vehicles, see here engine-codes.com/p1151.html
