Cylinder detonation is another possibility, due to high engine temperatures. These can range from a faulty spark plug lead, shorted kill switch or flywheel key damage. We finally fixed to where it is driveable and all at sudden we got 2 codes that triggered the engine light. Welcome to The Truck Stop! I had assumed the codes were not related but a pattern seems to be emerging. I took the Map sensor out and found a film of oil on the tip and also inside the intercooler pipes.
Funny thing is I cross referenced the part no. Thanks for the info andyward1971. Will do Variable Buzzard, hopefully one of us will come up with an answer. I carried out a temorary bodge by using a wide jubilee clip to close it up when refitting but have ordered a new clamp these come with a screw fixing. Your truck knowledge is missing! What caused it I can't really say, but what I had actually done was to floor the accelerator in 4th gear when overtaking, at about 45mph. It's a bit like having a fuel consumption policeman in the car with you.
What are the common causes of code P0238? Putting the engine under load seems to be the trigger in my case so I intend to concentrate on this area. Some times within a few miles other times you can drive half the day. Then it states that the customer concern may not be able to be duplicated all the time. As I say, I don't suppose I have solved the problem unless the egr valve has some influence on the operation of the solenoid valve but it would be nice to find a description of how all the sensors interact with each other on this engine. Turn the car off for 15 seconds and restart and it seems fine until the next time it sets. Thus, if the boost signal is high, the voltage signal is expected to be high, when the boost pressure is low, the voltage must be low as well.
And if you know anything about modern cars, replacing the catalyst does not come cheap! This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. So the next obvious fault would be in the wiring. Yep same here under load everytime at the same sort of revs, sometimes just the engine light comes on and drives not too bad but other times it will go in limp mode where it struggles to get up a hill in 2nd gear but on the drive stationary it will rev all day with no engine light. I have since replaced it. Hope you get yours sorted. Ive looked on you tube to see what other peoples actuators do and mine dosnt seem to move much, certainly takes some revs to start moving it and also when engine switched off my actuator stays retracted, on other peoples actuators they extend so im sure my actuator is sticking.
The turbo boost sensor is responsible for controlling the boost pressure inside the motor. Compare this reading with the value stated in the manual, and replace he sensor if its resistance does not fall within the range specified by the manufacturer. I bought a code reader and cleared the codes I had previously - that was about two weeks ago. Some shops are reporting corrosion on the fuel pump ground that reduces power and fuel pressure. After the warning light came on there was no change in performance. In my case I am pretty sure it was. I find myself in a similar situation.
Check for vacuum at idle at the solenoid and at the vacuum motor wastegate actuator , and check that the vacuum motor holds vacuum. I may be completely wong but as I understand it a split or blocked hose would cause a lack of vacuum and prevent the actuator from opening fully thus causing underboost rather than the P0234 overboost condition. On most applications, several engine sensors share one of two reference voltage circuits, which means that a failure or defect in one circuit can affect the operation of several engine sensors simultaneously. I can't imagine troubleshooting these things without real-time readings from the sensors. And maybe do the same if you try something that doesn't work. The glow plugs continue to operate for a max of 60 secs to help improve fuel combustion and emmissions. I hope it solves your problem.
With the original ecu ground wires repaired my picasso runs now, once i get the cooling fan sorted its running constantly with engine running , my mechanic has sourced that problem to a relay in the main fuse box under the bonnet but its part of the fuse box so that has to be replaced, if i get the fan off im thinking trade in time - fed up. I don't for one moment suppose I have cured the fault but the wife had last week off as as we are off to Cornwall in a few weeks I thought I would take the opportunity to get the Picasso in my garage and give it a service. It seems I have a different valve which is only available from Citroen for £98. Hi p0238 code could be a number of things, even though my picasso has gone i can give some advice as ive sure had my fair share of problems. It's possible to get to quite high revs without actually flooring the pedal - so I don't think it's precisely rev-related. Boost pressure sensors can be the cause of a P0238 code! Also he gave me a few things to check. The most common failure is the boost sensor shorted internally, or the harness has been shorted on the exhaust manifold.
The car keeps setting a P0238 code and going into derate at random times. Anyone have any input on what else may cause this? I ran it hard a few times to blow the turbo etc out. You end up being very light-footed on the accelerator. On most applications, this sensor is known as the Manifold Absolute Pressure sensor, and it works by changing its internal resistance in response to changes in the pressure of the intake air. Just wondering if anyone has come across these combined faults before and found a single solution before I start spending money on items that may or may not provide a solution. But it does look like both AndyWard and Paul T have been getting this fault, and neither of them have yet been able to solve it. We buy all our scanners from them and think you should too! The same condition still happens.