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Code P0401?

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

There are two ways to clear the Direct Trouble Code(s)(DTC)(s) and turn off the Malfunction Indicator Lamp (MIL) on any OBD2 equipped car, from 1996 to present. The first is to clear the DTC with a scan tool. This is the preferred method. The second, and less preferred method, is to simply unhook the negative battery terminal for at least 5 minutes. This will wipe out the Keep Alive Memory(KAM) in your vehicle's Power-train Control Module (PCM) or "computer", which is where the DTC(s) are stored. In the diagrams down below I have included the factory diagnostic troubleshooting guide for your vehicle for DTC P1000. Please go through this guide, so you can turn your vehicle's MIL off, and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
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Monday, January 11th, 2021 AT 10:14 AM (Merged)
Tiny
KEEGNATION
  • MEMBER
  • 14 POSTS
Okay, Alex, I realized based on your definition of flashing check engine light that I needed to learn how one might define it. Using these definitions, my cars check engine light only turns on and off intermittently while driving 40 to 50 mph. In the short term, I will not drive it until we solve the problem.

Intermittent
Sometimes, the problem comes and goes. This is referred to as an intermittent or soft failure and can cause the light to flash, stop flashing, and then start again. The problem appears only when certain conditions appear. For example, the loose connector or broken wire that keeps connecting and disconnecting when the vehicle travels over bumps or irregularities on the road, causing the light to turn on and off for periods at a time.

Continuous Flashing
When the check engine light flashes continuously, it means you have a critical problem that will cause serious damage if neglected. Usually, this originates in a misfire that allows fuel to pass into the exhaust manifold and down to the catalytic converter where high temperatures ignite the fuel. Eventually, this condition will damage the exhaust system or catalytic converter. You need to fix the problem soon before a minor repair turns into a major and expensive one.
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Monday, January 11th, 2021 AT 10:14 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

If your repairs are successful, they will clear after 50 key starts with no continuing issue.

The most common failure is the EGR pressure sensor.

Roy
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Monday, January 11th, 2021 AT 10:14 AM (Merged)
Tiny
JIS001
  • MECHANIC
  • 3,408 POSTS
Looks like it does. I am surprise that scanner is so cheap? I might order one myself?
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Monday, January 11th, 2021 AT 10:14 AM (Merged)
Tiny
WHITESHIRTSAMMY
  • MEMBER
  • 60 POSTS
Oh, wow. I cannot wait 50 key cycles. I replaced the EGR Vacuum Regular solenoid and DPFE sensor and I am still having this issue. Do you have the pin layout and voltages in/out to these sensors?
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Monday, January 11th, 2021 AT 10:14 AM (Merged)
Tiny
KEEGNATION
  • MEMBER
  • 14 POSTS
Okay, a couple of updates. I noticed that a coil plug came out of its socket slightly. I'm not sure if the screw threads are stripped, but I tightened it back down and the majority of the roughness is gone. There's still some rough bumps though, one at idle, and another at 40-50 mph. This also solved the random dead battery issue.

The scanner came in, no stored DTC codes or pending codes but probably because I need to drive it around since I've had to jump start the truck. What type of data should I share?
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Monday, January 11th, 2021 AT 10:14 AM (Merged)
Tiny
WHITESHIRTSAMMY
  • MEMBER
  • 60 POSTS
DPFE sensor is the EGR pressure sensor, correct?
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Monday, January 11th, 2021 AT 10:14 AM (Merged)
Tiny
SCGRANTURISMO
  • MECHANIC
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Hello again,

I am glad to hear you got it straightened out. If your cose reader is capable of reading pids I would want to look at SHTRMFTB, SHTRMFTB2, make sure that O2B1S1 Voltage is switching between 0.1Volts and 0.9Volts, same for O2B2S1. If not if you drive it 2 times for me with a 10-15 minute break in between drive cycles, making sure to bring it up to temperature. Send us any DTC(s) that illuminate the MIL.

Thanks,
Alex
2CarPros
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Monday, January 11th, 2021 AT 10:14 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
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Correct.

Were the hoses to the DPFE melted?

Roy
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Monday, January 11th, 2021 AT 10:14 AM (Merged)
Tiny
JIS001
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I would also look at Mode 6 data as well and look for test ID 53. See image below. If that information is available it will be a lot of help. When your in Test ID 53, take a pic of All the component ID'S and post them on here.

Before you do that, make sure you have a good battery because a week battery will cause the data to clear. If the battery is good drive the truck to make the condition you are describing appear. Do that for a couple of miles. Once you get home, let it idle and then scan it for codes and look for mode 6 on your scanner and test I'd and take pictures of all the component ids. Let us know please.
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Monday, January 11th, 2021 AT 10:14 AM (Merged)
Tiny
WHITESHIRTSAMMY
  • MEMBER
  • 60 POSTS
The hoses to the DPFE are not melted.

I will try and check these sensors and report back in a few minutes.
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Monday, January 11th, 2021 AT 10:14 AM (Merged)
Tiny
KEEGNATION
  • MEMBER
  • 14 POSTS
Hi Alex,

Okay, I think you are onto something. I took three readings, 1) one cold just for reference, 2) one warmed but idling and 3) one while the car was driving 60mph.

Okay, so these readings are at warmed and idling (2).
Shrtft1 -. 8
Longft1 4.7
Shrtft2 - 2.3
Longft2. 8

There are 3 photos of the other data, just for reference.
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Monday, January 11th, 2021 AT 10:14 AM (Merged)
Tiny
ASEMASTER6371
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Sounds good.

Roy
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Monday, January 11th, 2021 AT 10:14 AM (Merged)
Tiny
KEEGNATION
  • MEMBER
  • 14 POSTS
Here's 1 of 3
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Monday, January 11th, 2021 AT 10:14 AM (Merged)
Tiny
WHITESHIRTSAMMY
  • MEMBER
  • 60 POSTS
I manually cleared the code, drove the vehicle, the code is back.

The DPFE and the EGR is brand new.

I unplugged the connector from the DPFE, while the vehicle was on and checked the voltages: First pin 5v, middle pin 0.082v, the last pin 5v.
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Monday, January 11th, 2021 AT 10:14 AM (Merged)
Tiny
KEEGNATION
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2 of 3
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Monday, January 11th, 2021 AT 10:14 AM (Merged)
Tiny
ASEMASTER6371
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The voltages are correct.

You need a advanced scan tool to monitor the signal village while the engine is running.

Roy
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Monday, January 11th, 2021 AT 10:14 AM (Merged)
Tiny
KEEGNATION
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3 of 3
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Monday, January 11th, 2021 AT 10:14 AM (Merged)
Tiny
WHITESHIRTSAMMY
  • MEMBER
  • 60 POSTS
How advance? i have a Innova 3040e (https://www.innova.com/en-US/Product/Detail/3040e)
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Monday, January 11th, 2021 AT 10:14 AM (Merged)
Tiny
KEEGNATION
  • MEMBER
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Eff, you need this 4th photo too.
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Monday, January 11th, 2021 AT 10:14 AM (Merged)

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