My on board diagnostics tells me code p033.

Tiny
ANONYMOUS
  • MEMBER
  • 1994 CADILLAC SLS
  • 103,876 MILES
My on board diagnostics tells me code p033 current any idea what this code could mean?
Tuesday, December 4th, 2012 AT 11:42 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,883 POSTS
33 - map sensor signal out of range, high

Measure the three voltages on the map sensor. One must have 5.0 volts. The ground wire will have close to 0.2 volts. The third one relates to this code. It should have roughly between 0.5 and 4.5 volts depending on intake manifold vacuum. The only way for it to go to 5.0 volts and set this code is if the ground wire is open, (it will measure 5.0 volts), the sensor is defective, (the ground will have the proper 0.2 volts but the signal wire will have 5.0 volts), or the signal wire is open, (all three voltages will be correct at the sensor).
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Wednesday, December 5th, 2012 AT 12:43 AM

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