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Discussion Starter · #1 ·
in this order
codes: p0238
p2227
p0122
p0223


helping neighbor, in january she got the throttle body replaced at the dealer.

Last week she said when getting on to the freeway she floored it and she heard a "woosh" and the car didnt have power after that. when she left work it had power again. then when getting onto the freeway she heard a "woosh" again and the car didnt have power the the CEL turned on.

i connected my ELM and ran torque and pulled the above codes. i cleared the codes and started it and then checked for codes. it immediately had P0122 & P0223 in pending. took it for a drive and it had power until the on ramp. then "woosh" then no power, boost would not go above 8psi according to torque. CEL turned on and i pulled the 4 codes listed above. i swapped her MAPs with mine, cleared the codes, started it up and it had P0122 & P0223 in pending. took it for the same drive, again "woosh" no power and again boost would not go above 8psi. Then CEL again. pulled the same 4 codes. brought it back and pressure tested, no leaks at 25psi. valve cover good, intake still has the nipple.

could the throttle body go out that quick?
what the heck is going on with the MAP codes??

can you make me look like the hero?
 

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2014 LT program car, Pull Me Over Red, 1.4T Auto
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Potential causes for the P0234 DTC include:

In lieu of further trouble codes associated with the overboost condition it would be safe to say the problem is mechanical.
The operation of the wastegate is the most probable.
The wastegate is either stuck closed causing the turbo to spin higher than normal, thus causing the overboost.
The rod from the wastegate actuator to the wastegate on the turbo is bent.
A hose came off the wastegate or boost controller.
A supply house to the boost controller or from the controller to the wastegate is clogged.


Read more at: https://www.obd-codes.com/p0234


And here are the associated codes...


p0238
Potential causes for this code to set are:

DTC’s related to intake air temperature sensor (IAT), engine coolant temperature sensor (ECT), or 5 volt reference Intermittent wiring problems
Faulty boost sensor "A"
Short circuit to voltage on sensor circuit
Faulty PCM

Read more at: https://www.obd-codes.com/p0238


Causes for this P2227 code may include:

Defective or damaged BAP (Barometric Air pressure) sensor
Defective or damaged electrical connector
Wiring issue (e.g. open, short, corrosion)
Electrical short (internal or mechanical)
Loose electrical connection
Heat damage
Mechanical malfunction causing altered BAP readings
ECM (Engine Control Module) issue


Read more at: https://www.obd-codes.com/p2227




A code P0122 may mean that one or more of the following has happened:
TPS not mounted securely
TPS circuit short to ground or another wire Faulty
TPS Damaged computer (PCM)


Read more at: https://www.obd-codes.com/p0122





Possible causes for P0223 engine code include:

Open or shorted circuits between the TPS, PPS, and the PCM
Defective TPS or PPS
Corroded electrical connectors
Faulty drive-by-wire actuator motor


Read more at: https://www.obd-codes.com/p0223
 

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Discussion Starter · #5 ·
Potential causes for the P0234 DTC include:

In lieu of further trouble codes associated with the overboost condition it would be safe to say the problem is mechanical.
The operation of the wastegate is the most probable.
The wastegate is either stuck closed causing the turbo to spin higher than normal, thus causing the overboost.
The rod from the wastegate actuator to the wastegate on the turbo is bent.
A hose came off the wastegate or boost controller.
A supply house to the boost controller or from the controller to the wastegate is clogged.
whats the best way to test for this?
 

· Administrator
2014 LT program car, Pull Me Over Red, 1.4T Auto
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14,174 Posts
Diagnostic Steps & Possible Solutions:

Inspect the wastegate actuator rod to the turbo. Repair it if its bent.

Inspect the hoses including the one from the boost controller to the wastegate actuator and the feed lines to the boost controller. Look for cracks or disconnected hoses. Pull the hose ends and look for plugged lines.

Connect a vacuum pump to the wastegate controller. Pump it slowly while watching the actuator rod. Make a note of the inches of mercury necessary to actuate the rod, or whether the rod moves at all. Consult a service manual for vacuum necessary to actuate the wastegate. If it is out of specification, replace the actuator.

If the rod fails to move or the wastegate actuator fails to hold vacuum, replace the actuator. If it holds a vacuum yet fails to move the rod, the internal wastegate in the turbo is stuck closed. Remove the turbo and have the wastegate repaired.

Start the engine and disconnect the supply hose to the boost controller. Inspect it for obstructions and boost pressure. Install the hose and disconnect the hose on the opposite side of the boost controller. There must be boost pressure present - if not replace the boost controller.


Read more at: https://www.obd-codes.com/p0234
 

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Discussion Starter · #7 · (Edited)
UPDATE:
pulled the actuator hose off to test it - oil dripped out i then moved the actuator and oil spurt out.
WTF?
i checked mine and it did not drip oil, so i pulled hers off and drained the oil out.
why the oil ?

SO i ordered a replacement actuator - same issue argh!!!
possibly the turbo bypass valve?
 
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