obd code po236?

[85-m1028]

I just bought a 97 chevy 2500 with about 280,000 miles on the odometer, a very well matained truck "runs like a champ"

the check engine light came on after a 300 mile round trip and I pulled a code p0236 "input voltage for boost pressure sensor "A" is out of range for the current engine operations"

still learning about these newer electronic controled 6.5's man its sooo much quieter than my old 6.2!!

I erased the code and it hasn't popped up again as of the last 50 miles. what should I do?

do I need to replace the boost sensor?

[rhsub]

DTC P0236 sets when actual boost pressure is 20kpa different than desired boost pressure under certain operating conditions mainly being that the engine is is under load and rpm is greater than 1800
A vacuum leak or a pinched line is the usual cause, check vacuum pump to make sure you have vacuum
check wastegate actuator with a hand held vac pump, should hold vac
check wastegate rod for proper movement, should move easily with engine off, no vac to actuator
check for vacuum at wastegate actuator 15" at idle. vac will fluctuate
unplug electrical connector at wastegate solenoid vac should drop to approx 1" at idle
check wastegate solenoid filter, may be plugged
when this code is set you will have poor perfomance, reduced max fuel and no torque converter lock up and you may have black smoke under accel
One other thing; acording to my GM manual P0236 is Turbocharger boost system performance which sounds different than what your description is
Hope this helps
Let us know what you find or if you need more info
Good luck
Ron

[85-m1028]

thank you!! I will check that asap. time to go through the engine and check all the vac lines!

[DennisG01]

The little check valve inside the solenoid gets corroded over time and sticks. Spray some WD40 into the vac line that's attached to the wastegate - it's also good PM to do this every so often.

[ronale]

Code P0236 was pulled when I lost turbo boost a year ago.
I replaced both vacuum solenoid and boost sensor.
No boost problems has occurred since.

[85-m1028]

well it turns out the vac line popped off. The transition from the bigger hose to the smaller one is right behind the alternator! It took me a while to find it!!

[DennisG01]

It took me a while to find it!!

On the other hand, it's always a good fix when it's a free fix! Persistence pays off!