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No Bus, code P3040 bank a sensor

Tiny
EDDIE BLAKE
  • MEMBER
  • 1998 PLYMOUTH BREEZE
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 198,000 MILES
I bought this car and drove it down the street. It shut off and my code reader said p3040 sensor bank a. So I replaced the cam shaft sensor, I also had to replace the fuse for the dash. After that it now says no bus and when I try to start it it says no bus and kind of sounds like the battery is going bad. The fuel gauge also bounces up and down. I tried to jump it but didn't start I checked the fuses and they were good.
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Tuesday, September 22nd, 2020 AT 7:40 PM

8 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,244 POSTS
Hi,

Can you recheck the code? Do you mean P0340?

If it's a P0340, that indicates no cam signal at the PCM. Here are diagnostics for that code:

_______________________________

The attached pics are the actual diagnostics.

1998 Plymouth Breeze L4-2.0L VIN C
TC-1A No Cam Signal at PCM
Vehicle ALL Diagnostic Trouble Codes ( DTC ) Testing and Inspection Manufacturer Code Charts Trouble Code (TC) Tests TC-1A No Cam Signal at PCM
TC-1A NO CAM SIGNAL AT PCM
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Pic 1

Diagnostic Chart

pic 2

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pic 3

Diagnostic Chart

pic 4

_______________________

Let me know if that is the code and if this helps.

Joe
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Wednesday, September 23rd, 2020 AT 5:27 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Couple things. Do I understand it correctly that the P0340 is no longer there?

We need to start with load testing the battery as if this is drained it will cause all sorts of crazy issues.

https://www.2carpros.com/articles/car-battery-load-test

Then we need to replace it if needed then check for codes again.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

The no BUS message means the PCM cannot communicate with other modules so it puts this message up.

Let me know what happens with this and we can go from there.
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Wednesday, September 23rd, 2020 AT 5:27 PM
Tiny
EDDIE BLAKE
  • MEMBER
  • 4 POSTS
Changed battery no BUS went away, but still won't start. Doesn't sound like the starter. It had old gas in it but l had been bleeding it from the line and I think I got it all out. It sounds like it wants to start but something isn't happening.
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Wednesday, September 23rd, 2020 AT 6:00 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,244 POSTS
Hi,

Do me a favor. Record it cranking so I can hear what it's doing. Also, see if it starts with starting fluid.

Joe
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Wednesday, September 23rd, 2020 AT 6:35 PM
Tiny
EDDIE BLAKE
  • MEMBER
  • 4 POSTS
Okay.
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Wednesday, September 23rd, 2020 AT 7:09 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Hearing it will help so that is a good idea. Also, if you had old fuel, you may want to change out the plugs as old fuel will foul the plugs and cause it to not start and act like it wants to start but not catch.
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Wednesday, September 23rd, 2020 AT 7:42 PM
Tiny
EDDIE BLAKE
  • MEMBER
  • 4 POSTS
That's what it's doing.
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Thursday, September 24th, 2020 AT 4:05 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,244 POSTS
Hi,

Not sure what you mean. Is it trying to start as KaseKenny mentioned? Also, have you tried starting fluid?

Joe
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Thursday, September 24th, 2020 AT 6:27 PM

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