Not starting, internal controller failure

2001 JEEP GRAND CHEROKEE
166,561 MILES • 4WD • AUTOMATIC
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CAPTYAYA1124
  • MEMBER
  • 1 POST
Throws codes:

P0601- internal controller failure
P1781- overdrive pressure switch sense.
circuit
P1732- fault in the under-drive pressure.
switch circuit
P0135- sensor heater circuit malfunction.
bank 1 sensor 1
P0155- o2 sensor heater circuit malfunction.
bank 2 sensor 1
P0161- o2 sensor heater element
malfunctioning bank 2 sensor 2
P1499- hydraulic fan control solenoid


When i got vehicle, the fan has a kill switch installed. Vehicle had intermittent starting issues and anti-theft was disabled and something called anti-lock system was removed. Now the vehicle doesn't start after intermittent issues since i got it a month ago. What do i need to do to reverse or fix issues so it will start and run?
Jun 11, 2022 at 10:40 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
Hi,

That's a tough question because I don't know what has already been done. I can tell you that the majority of the codes are likely caused by a faulty PCM. Take a look at the pic below.

As far as getting it running, I suspect the primary problem is the PCM. When you try to start it, does the starter engage?

Let me know.

Joe

See pic below.
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Jun 12, 2022 at 1:54 PM
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