2012 f150 keeps resetting computer
Hotshot
Joined: Jan 2004
Posts: 19,768
Likes: 1,082
From: St Louis
The PCM does not have the capability of "showing multiple resets". It can only show that it has been reset and has not completed all of the OBDII self test monitors that are required for an OBDII-based emissions test. There is no "hidden fuse".
What is the recent history of the truck?
What is the recent history of the truck?
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4wd Low
Joined: Aug 2013
Posts: 12
Likes: 0
All I can say it was 2 different inspection shops have told me. They both said it shows 3 recent resets? They said it was like when you have a code and you reset the computer to show no codes. It’s my dads daily driver, never had any problems with it before. Always passed inspection with no problems. I was thinking there was a memory/12v constant fuse that might be blown. I checked all the fuses and did not find any blown.
5th Wheeling
Joined: May 2019
Posts: 32
Likes: 0
From: Washington LA
It needs to complete the drive cycle to clear the P1000 code that is set when someone clears codes. I normally let the vehicle run to reach operating temperature and make sure the fuel level is between 1/4 and 3/4 which is required for the EVAP test to run. I drive around 5-10 miles stopping usually 5-7 times and turn ignition to off the restart and continue the road test. That usually completes the OBD II monitor cycle.
Hotshot
Joined: Jan 2004
Posts: 19,768
Likes: 1,082
From: St Louis
Something is being either miscommunicated or not communicated, either by you or the shops.
Is the computer showing an actual fault code (DTC)? If so, what is it? Is it showing certain monitors as "incomplete"?
What state is this in?
What engine and transmission is installed in the truck?
Is the computer showing an actual fault code (DTC)? If so, what is it? Is it showing certain monitors as "incomplete"?
What state is this in?
What engine and transmission is installed in the truck?
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4wd Low
Joined: Aug 2013
Posts: 12
Likes: 0
No fault codes, it’s a 3.7l with an automatic transmission. I checked for codes myself after I left and there are no codes. They keep saying the same thing, their machine that they hook it up to will not pass it because it shows it has been recently reset, I ve never had any problems like this, very frustrating, they are telling me I need to go to the dealership and have them reflash the computer.
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5th Wheeling
Joined: May 2019
Posts: 32
Likes: 0
From: Washington LA
Most code readers will not check the monitors as far as I know. Do you know of a shop with a diagnostic scanner that can check it for you? May have to drive it while monitoring the drive cycle data to see if something is not reading correctly. Also have you checked the battery and connections? If the battery has low voltage on start up it could be dropping out at the PCM and that can cause a monitor reset to happen. You said it had 3 resets before you tried what I suggested then it had 5 after. Maybe the restarts dropped the voltage too low. If you have a volt meter you can see the voltage drop at the battery, if it is below 10v at start up it could be a problem. This is information from the workshop manual. On some vehicles, DTC P1000 may set. It is not necessary to clear DTC P1000 from the powertrain control module (PCM) by driving the vehicle, unless requested by the customer, to pass an I/M test. The only way DTC P1000 can be removed from memory is when all the OBD monitors are successfully completed.
On vehicles that support DTC P1000, the DTC may set under any of the following conditions:
- The vehicle is new from the factory and has not yet completed an OBD drive cycle.
- The battery or PCM is disconnected.
- An OBD monitor concern occurred before completion of an OBD drive cycle.
- The PCM DTCs have been cleared with a scan tool as part of a repair process.
- The PCM has been flashed and the vehicle has not yet completed an OBD drive cycle.
- DTC P1000 may not clear if the vehicle is equipped with a power take off (PTO) and the PTO is engaged or damaged.
On vehicles that support DTC P1000, the DTC may set under any of the following conditions:
- The vehicle is new from the factory and has not yet completed an OBD drive cycle.
- The battery or PCM is disconnected.
- An OBD monitor concern occurred before completion of an OBD drive cycle.
- The PCM DTCs have been cleared with a scan tool as part of a repair process.
- The PCM has been flashed and the vehicle has not yet completed an OBD drive cycle.
- DTC P1000 may not clear if the vehicle is equipped with a power take off (PTO) and the PTO is engaged or damaged.
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