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P0101 and immediate stall


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This is a strange one. I just changed the PCV pipe from the intake to the PCV valve. Put everything back together and when I start it, the engine idles fine for about 10 seconds, then stalls with a P0101. Everything is hooked up correctly. If the MAF was bad, I wouldn't think it would idle normally.

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p0101 "Mass Air Flow (MAF) Circuit/Performance Malfunction" Code P0101 Definition Mass Air Flow (MAF) Circuit/Performance

Check all plugs around the MAF for being damaged or disturbed by the PVC pipe job.  

Did this happen before you replaced the PVC pipe?  What year/model vehicle is this?

Try disconnecting and reconnecting the negative battery connection to reboot the PCM.

Then see this thread

 

 

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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  • 2 weeks later...
On 10/10/2020 at 4:47 PM, BodybyFisher said:

p0101 "Mass Air Flow (MAF) Circuit/Performance Malfunction" Code P0101 Definition Mass Air Flow (MAF) Circuit/Performance

Check all plugs around the MAF for being damaged or disturbed by the PVC pipe job.  

Did this happen before you replaced the PVC pipe?  What year/model vehicle is this?

Try disconnecting and reconnecting the negative battery connection to reboot the PCM.

Then see this thread

Figured it out. It was actually due to a bad MAP sensor. The MAP had snapped in half where it attaches to the throttle body. The MAP basically verifies the operation of the MAF on engines with both sensors. Since the MAP was misreporting throttle vacuum, it stalled at idle. Since the ECM doesn't have a specific DTC to report this condition, it defaulted to reporting a P0101. Told you it was strange.

 

 

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@SteveW

Glad to hear you figured it out.  

I want to add this for future, I found it on AllData

Symptoms of Code P0101

Engine stalling

Difficulty starting

Lack of power

Rough idle

Causes of Code P0101

Dirty, obstructed, or faulty mass air flow sensor

Damaged or disconnected air intake boot (snorkel)

Vacuum leak

Clogged or improperly installed air filter

Clogged catalytic converter / restricted exhaust

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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