Came up with 12 and 47
Code 12 is Battery voltage to PCM disconnected within last 50 key-on cycles. So it's not a problem.
Code 47 is Battery under voltage. Probable cause is: Check the charging system.
SOURCE: engine code 95 jeep grand cherokee lerado
12 is a battery disconnect within the last 50 start cycles and 55 means the end of the diagnostic cycle. Basically the computer found nothing wrong. The 12 code may seem incorrect if you haven't disconnected the battery recently, but from my experience the 12 code shows up almost all the time regardless.
SOURCE: 1999 4.7 grand cherokee replaced used
There are a lot of things to check:
- check ANY wiring connector at the engine incl. ECU
- check fuel pump pressure (45 to51 PSI, 2,95 to 3,2 at), there is a connector on the right fuel line, between injector 3 and 5.
- check the sensor on the crankshaft if installed the right way.
- check injectors for leaking
- check your vacuum system careful
- check your TPS
Check your OBD II-System, all functions Engine and Freeze Frame, Emission control etc.
You can check the OBD-System first. Connectors and Software for PC/Laptop are sold for $ 100 to $ 170 incl. OBD-connector and wiring. This is a one time investment that saves you lot of costs and time
SOURCE: 93' Grand Cherokee, dont start, no spark,no gas preassure
my 1996 jeep grand cherokee lmtd. won't start did tune up. cranks but no fire. please help. engine code 54 shows up . cam shaft positioning no signal. . tested all circuit. changed cam shaft positioning sensor twice.still cranks did start once ran for 5 min. changed the sensor again. no luck. help please. keith
SOURCE: 93 grand cherokee 5.2 V8, red square flashing on VIC display
Your VIC doesn't provide you with codes per se, it supplies other information and what you describe here is what should be written on your VIC, "Coolant Sensor Bad." The actual Coolant Sensor runs to your PCM or computer and your check engine light will come on if it runs at or above 5 volts or below 0.1 volts. If the red square on the vehicle layout is illuminated under the hood area, it means that your Coolant Recovery jug is either low on anti-freeze or the sensor next to the yellow filler cap is faulty...meaning you're low on Coolant and the VIC says that the "Coolant Sensors Bad" yet it's the amount of fluid in the plastic bottle next to the passenger side firewall, right in front of your PCM or computer. If you're low on anti-freeze, keep an eye on it, or have the coolant system pressure tested...including the 18 pound cap on the radiator itself. Also check the two wires hooked to the Coolant LEVEL Sensor in the jug with an Ohmmeter and it should be an open circuit if the level is fine, or hardly any Resistance if the level is low, causing that circuit to complete it's ground circuit and thus signaling the VIC through your BCM to turn on. (Body Control Module). The Haynes Manual you will need is # 50025 which encompasses all Jeep Grand Cherokee's from 1993 thru 2004.
~Stillin~
SOURCE: My 93 Jeep grand cherokee
When the check engine lights turn on, I suggtes scabbed the PCM to know excatly what fault code in there. With this code number we can send additional details.
Check here to know how to read ENGINE CODES
Hope helps (remember to rate and comment this).
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