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Old 07-10-2020, 10:20 AM #1
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How to clear permanent DTC on 2016 limited ?

Hello everyone,

I disconnected my mas airflow sensor to check the air filter. Now I have P0102 stored as permanent. I cleared the check engine light, but the permanent won't go away. I already drove the car for 30 miles. It's still in there. I have also tried disconnecting the negative battery terminal. That did not help either.
Any idea what could be wrong?

Thanks

Last edited by amir_gh; 07-10-2020 at 10:24 AM.
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Old 07-10-2020, 10:34 AM #2
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Originally Posted by amir_gh View Post
Hello everyone,

I disconnected my mas airflow sensor to check the air filter. Now I have P0102 stored as permanent. I cleared the check engine light, but the permanent won't go away. I already drove the car for 30 miles. It's still in there. I have also tried disconnecting the negative battery terminal. That did not help either.
Any idea what could be wrong?

Thanks
If all you did was disconnect a connector, check that. Disconnect it again and examine for bent pins.
Here’s some general info on your P0102 code:
P0102 Mass Air Flow (MAF) Circuit Low
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Old 07-10-2020, 10:39 AM #3
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Quote:
Originally Posted by ElectroBoy View Post
If all you did was disconnect a connector, check that. Disconnect it again and examine for bent pins.
Here’s some general info on your P0102 code:
P0102 Mass Air Flow (MAF) Circuit Low
I will take a look, but there is no check engine light. Is there a drive cycle requirement to clear permanent codes? Is the following true?

The time to complete 15 warm-up cycles and drive 200 miles is reasonable for vehicles to complete the self-diagnostic tests. In fact, most vehicles will complete the self-diagnostic tests well before this maximum limit is reached. The 15/200 limit is being established to prevent undue inconvenience to motorists who are trying to comply with the Smog Check Program requirements but are having trouble getting specific monitors to run to completion and ready for testing.

Last edited by amir_gh; 07-10-2020 at 10:42 AM.
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Old 07-10-2020, 11:31 AM #4
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Originally Posted by amir_gh View Post
I will take a look, but there is no check engine light. Is there a drive cycle requirement to clear permanent codes? Is the following true?

The time to complete 15 warm-up cycles and drive 200 miles is reasonable for vehicles to complete the self-diagnostic tests. In fact, most vehicles will complete the self-diagnostic tests well before this maximum limit is reached. The 15/200 limit is being established to prevent undue inconvenience to motorists who are trying to comply with the Smog Check Program requirements but are having trouble getting specific monitors to run to completion and ready for testing.
The Check Engine Light function is just a dumb catch all notifier. It means, “hey, there’s a sensor that’s reporting a problem, go tend to it.” Or “you’ve driven X thousand miles, better get some service”. If you clear it, it goes away as if to say “OK My job is done.” But the original problem is stored as the specific DTC in memory. Just because the DTC is still in memory it won’t retrigger the Check Engine light On again.

The MAF is part of the emission control loop so it probably does need a drive cycle to clear it. But you need to address the problem that caused it to be set in the first place. Check that connector. Make sure the air filter is OK and the lid is closed properly. Maybe you do have a dirty MAF that needs cleaning. Then drive. Sometimes hitting the specific sequences in the drive cycle is tricky and it does take a long time and many miles to complete it.

If you’re in a hurry to get ready for a smog test you may have to research the drive cycle parameter profiles and follow them exactly. I did this for my 3rd Gen.
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Old 07-10-2020, 12:07 PM #5
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You can buy a OBD2 scan tool to erase permanent codes.

Advance Auto Parts - Down for Maintenance
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