1998 Pontiac Transport Montana
3.4 liter
dash lights = Yes service engine soon
codes = P1665, P0452 and P0440
work done prior = The service engine lite has been on sense I bought
the car. I had the transmission replaced because 1st and reverse were
shot. And the van runs great, but my gas mileage has gone way down and the
service engine lite wont shut off.
Work done to repair = I replaced the transmission and replaced the gas
cap. The front brakes and calipers were replaced too.
Tech = a true honest mechanic
question = The service engine lite has been on sense I bought the car.
I had the transmission replaced because 1st and reverse were shot. And
the van runs great, but my gas mileage has gone way down and the
service engine lite wont shut off.
Could this be an oxygen sensor problem?
JK:
p1665 - EVAP system vent solenoid circuit.
p0452 - fuel tank pressure sensor circuit low voltage
p0440 - general EVAP system problem
Something in common with these 3 codes is the fuse labeled " CAN VENT SOL"
which stands for Canister Vent Solenoid. If this fuse is blown, it will cause all
these codes.
If fuse OK, then possibly a problem at the fuel pump assembly connector on top
of the fuel tank.
Another area that can cause electrical problems with these circuits is a
pass-through harness connector under the van. Sometimes it gets corroded and
can cause these codes.
3.4 liter
dash lights = Yes service engine soon
codes = P1665, P0452 and P0440
work done prior = The service engine lite has been on sense I bought
the car. I had the transmission replaced because 1st and reverse were
shot. And the van runs great, but my gas mileage has gone way down and the
service engine lite wont shut off.
Work done to repair = I replaced the transmission and replaced the gas
cap. The front brakes and calipers were replaced too.
Tech = a true honest mechanic
question = The service engine lite has been on sense I bought the car.
I had the transmission replaced because 1st and reverse were shot. And
the van runs great, but my gas mileage has gone way down and the
service engine lite wont shut off.
Could this be an oxygen sensor problem?
JK:
p1665 - EVAP system vent solenoid circuit.
p0452 - fuel tank pressure sensor circuit low voltage
p0440 - general EVAP system problem
Something in common with these 3 codes is the fuse labeled " CAN VENT SOL"
which stands for Canister Vent Solenoid. If this fuse is blown, it will cause all
these codes.
If fuse OK, then possibly a problem at the fuel pump assembly connector on top
of the fuel tank.
Another area that can cause electrical problems with these circuits is a
pass-through harness connector under the van. Sometimes it gets corroded and
can cause these codes.
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2001 Pontiac Montana Engine size = 3.4. Check engine light.
Computer codes = P1639 and P0452.
Question = My 2001 Pontiac Montana has been reving up anywhere from 1500 to 3000 rpms. Went to
Autozone to have them test it and got codes P1639 and P0452. I replaced the fuel pump a couple
months ago. What do these codes mean and how do I fix them?
Computer codes = P1639 and P0452.
Question = My 2001 Pontiac Montana has been reving up anywhere from 1500 to 3000 rpms. Went to
Autozone to have them test it and got codes P1639 and P0452. I replaced the fuel pump a couple
months ago. What do these codes mean and how do I fix them?
Answer: The P0452 code is for the Fuel Tank Pressure Sensor, and the
P1639 is for the A/C Refrigerant Pressure Sensor. Both of these sensors
are on the same 5 volt signal circuit from the PCM, and that is why both
codes are set. There is something wrong that signal circuit to one of those
sensors and it is bringing the whole line down. You could have pinched the
wiring when you did the fuel pump, since the fuel tank pressure sensor is
located as part of the fuel tank module you removed. I'd check that out first,
although you will have to drop the tank again. Also, there have been
problems with the body pass-through connectors on the underside of the
van. If you follow the fuel pump harness from the tank, you will see it leads
to a small bulkhead on the underside of the body. Check that connection
for corrosion, or water intrusion. If there is a problem with that area, you will
need to replace that entire connector assembly. As for the revving up as
you drive, I don't think your current codes would cause that problem. You
could have a transmission issue, that would need further diagnosis.
P1639 is for the A/C Refrigerant Pressure Sensor. Both of these sensors
are on the same 5 volt signal circuit from the PCM, and that is why both
codes are set. There is something wrong that signal circuit to one of those
sensors and it is bringing the whole line down. You could have pinched the
wiring when you did the fuel pump, since the fuel tank pressure sensor is
located as part of the fuel tank module you removed. I'd check that out first,
although you will have to drop the tank again. Also, there have been
problems with the body pass-through connectors on the underside of the
van. If you follow the fuel pump harness from the tank, you will see it leads
to a small bulkhead on the underside of the body. Check that connection
for corrosion, or water intrusion. If there is a problem with that area, you will
need to replace that entire connector assembly. As for the revving up as
you drive, I don't think your current codes would cause that problem. You
could have a transmission issue, that would need further diagnosis.
