MIL light stays on on 2008 C

[skylane]

Is there any way of cycling the ignition switch to see if the OBD has thrown a code?

[MADDOG]

1. Get in the car, close the door.

Perform steps 2-6 fairly quickly (less than 3 sec's total time).

(The key should not return to the OFF position through this next sequence!)

2. Turn key to 'ON' position

3. then back to 'ACC'

4. then to 'ON'

5. then back to 'ACC'

6. then to 'ON'

If there are any stored codes, they will appear immediately, in place of the odometer. Once the codes have been displayed, you'll see "-----". If there are no trouble codes, the dashes will be the first item displayed.

After a few seconds, the display changes to "-dOnE-".

Post up what ya find and we can decode it for ya.

[ChryslerCares]

Turn the ignition key from ACC to ON to ACC to ON, and ACC to ON, leaving it in the ON position.
Then read the EVIC display, where the mileage is displayed, and read any codes that may be present. When finished the display will show " done ".

Have a pad and pencil ready to write down any codes that pop up.

If the "check engine" (MIL) starts to flash you have a major problem and the vehicle should not be driven.

[MADDOG]

^^^^ Good stuff, buddy! ^^^^

[skylane]

The code I got was 0520 which is the Oil pressure system. Oil level is good and the readings are in the high 20s at idle and in the 50s at about 45 to 50 mph. Only thing strange thing I see is that in 1 out of three times of switching on and not starting, the oil pressure shows 6 psi and the other times it shows 0 zero (normal) without starting. Something is out of calibration and I figure it is the sender.

[MADDOG]

P0520 is the oil pressure sensor or the sensor circuit:

P0520-ENGINE OIL PRESSURE SENSOR CIRCUIT

• When Monitored: Ignition on, engine not running.
• Set Condition: The PCM senses the oil pressure is out of the calibrated range.

Possible Causes
(G6) ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
RESISTANCE IN (G6) ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT
(G6) ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
RESISTANCE IN (F856) 5-VOLT SUPPLY CIRCUIT
(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT
ENGINE OIL PRESSURE SENSOR
PCM

if connections are OK, most likely the sensor.

[antijam]

Coincidentally I've just discovered that my MIL light (2010 CRD) is staying on too.

I've done the 'ON/ACC' sequence and the EVIC shows no error codes. Any ideas which faults might not throw up a code?

[skylane]

I drove to an Autozone Auto Parts store and they walked outside with the code tester and gave me the code it had put in the system.

[MADDOG]

Try pulling your negative battery cable off for about 2 minutes and put it back on, antijam. That should reset the code and and unless you have a a real problem, it should not light up the second you start your car again.

If it does come back, then there IS a code.

[antijam]

Originally Posted by MADDOG

Try pulling your negative battery cable off for about 2 minutes and put it back on, antijam. That should reset the code and and unless you have a a real problem, it should not light up the second you start your car again.

If it does come back, then there IS a code.

Thanks for the tip, MADDOG. Before I'd read your reply I'd dropped the car in with my local friendly garagiste. His limited diagnostic gear did allow him to read and reset the error. Apparently what came up was an 'unspecified' error code, which I guess could mean anything from water in the fuel to a loose connection.

Anyway, the MIL light is out at the moment and hopefully will stay that way. If it does occur again I'll try your tip first.