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Codes 0601,0385,0340, cranks but will not start

Tiny
JOJO DADA
  • MEMBER
  • 2001 CADILLAC DEVILLE
  • V8
  • AUTOMATIC
  • 15,000 MILES
Car cranks but won’t turn over. Replaced battery. Sounds like it’s out of gas no security light throws codes 0601,0385,0340. Battery was replaced with a 78 group not 79 group that car came with so it’s smaller.
Tuesday, September 28th, 2021 AT 12:55 PM

1 Reply

Tiny
AL514
  • MECHANIC
  • 4,692 POSTS
Hello, was the battery replaced because it would not crank over? Or what was the reason? Because this first code P0601 is an ECM computer memory code. Which means the cars main ECM may have been damaged or there could be a wiring issue and the ECM is not getting a full 12volts to power it fully. Has the car been jump started at all?
The other diagrams below are for the other codes, but those sensors run on 12volts, so again if it's missing this voltage, which it sounds like it is, it will set these codes as well. The first code is the clue here.
Has the charging system been checked as well, to make sure the alternator is putting out the correct voltage?
Also, where did you get the battery replaced at?
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Tuesday, September 28th, 2021 AT 3:02 PM

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