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post #1 of 9 (permalink) Old 10-18-2012, 11:48 PM Thread Starter
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Help p1521 code!

Hey everybody Im a new member and need your help. My car wont start and the code that im getting is the p1521 wrong oil code. My car was taken to my local mechanic for repair bc 1 of the heads had damage. The piston in chamber 1 hit the top of my head and damaged it. I had the head machined, and the piston, and rod replaced in chamber 1, along with the intake manifold bc it was also damaged. That was a week ago, and everything seemed fine until today when I went to start my car, and it wouldn't, and then I got the P1521 code. Help!
Oh and the seals were replaced as well.
Thanks!

Car is a 06 300c 5.7L.
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post #2 of 9 (permalink) Old 10-19-2012, 11:10 AM
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P1521–INCORRECT ENGINE OIL TYPE
  • When Monitored: Engine Running.
  • Set Condition: Using the oil pressure, oil temperature and other vital engine inputs the PCM can determine the engine oil viscosity. Incorrect viscosity will effect the operation of the MDS by delaying cylinder activation .
Possible Causes INCORRECT ENGINEOIL TYPE ENGINE OIL CONTAMINATION ENGINE OIL
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
Diagnostic Test

1. ACTIVE DTC
NOTE: Review the customers oil change history. Ensure the customers is using the correct engine oil viscosity. If the incorrect oil is being used, change the oil, using the correct engine oil viscosity.
Ignition on, engine off.
With the scan tool, read DTCs.
Is the DTC active at this time?

Yes
  • Go to 2
No
  • Test Complete.
2. ENGINE OIL
NOTE: If set along with P1521, repair any engine oil pressure or temperature DTCs first before continuing.

The following conditions must be checked.
  • OEM recommended oil viscosity is being used.
  • Customer is following the oil change schedule.
  • Check the engine oil for contamination. (i.e., fuel and/or engine coolant)
  • Internal engine condition that may effect oil pressure.
Were any of the above conditions found?

Yes
  • Repair as necessary.
  • Perform the POWERTRAIN VERIFICATION TEST.
No
  • Change the engine oil using the correct oil viscosity.
  • Perform the POWERTRAIN VERIFICATION TEST.
If this was an early production vehicle I'd say check with a dealer on a TSB that was issued for this. But since you just had the engine rebuilt I suggest that you:

1. Verify oil viscosity used.
2. If incorrect oil was used, drain and refill with proper weight oil.
3. Insure that your oil pressure sensor has not been damaged during the repair work.

Michael
2006 300C SRT8
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post #3 of 9 (permalink) Old 10-19-2012, 10:35 PM Thread Starter
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Thanks MADDOG! had my car towed to my mechanic, and he told me that it was the battery. He changed the battery, and the car started right up. He also changed the oil with mobil 1 5w20 synthetic. SO I left the shop and everything was fine, and then the car started acting up again a few hours later. (So I went home and the car was fine, and left the car in the drive way for a few hrs then took the car back out and the car started acting up again.) When i was accelerating the engine felt like it didn't want to. The check engine light came back on, and the lightning symbol is also on. The p1521 hasn't come back yet, but perhaps its to soon. My mechanic erased the codes when he worked on it. Was wondering about your thoughts on the flashing pcm. Do you think flashing it will help? Is this a voltage problem, and will flashing the pcm help with that?
Also do you know what the dealership charges for this?
FLashing my pcm will update with the latest software correct?
I'll check out the oil pressure sensor as you recommended. Any other ideas as to what might be the cause?
Thanks again!
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post #4 of 9 (permalink) Old 10-19-2012, 10:37 PM Thread Starter
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Also could this be a problem, with the oil sending unit, or oil pressure switch?
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post #5 of 9 (permalink) Old 10-20-2012, 03:25 PM
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There's more than one thing going on here. It may be a power connection or the main connection to the PCM (dirty, corroded, loose, etc...) or it could be a PCM problem.

I'd get the car to a Chrysler dealer so they can do a full diagnostic and retrieve all DTC's on the unit.
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post #6 of 9 (permalink) Old 10-20-2012, 11:39 PM Thread Starter
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Thanks again MADDOG! I will check out the connection to the PCM to see if its loose or dirty. Can the connection to the PCM easily be replaced, or cleaned?
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post #7 of 9 (permalink) Old 10-21-2012, 09:47 AM
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Cleaned. Yes

Replaced. No

Try some CRC electrical contact cleaner if you find dirt or water in there.
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post #8 of 9 (permalink) Old 10-23-2012, 11:39 PM Thread Starter
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Thanks again MADDOG! Will try to clean out the PCM plug as you suggested. Will let you know how it turns out. Peace!
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post #9 of 9 (permalink) Old 04-07-2015, 06:38 AM
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Sorry to revive this old thread.... Was this problem resolved and what was the actual problem. Thanks.
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