Has anyone had any issues with getting a P0121 for the throttle position sensor and immediately following that code a p0299 for turbo underboost condition? I can clear the codes and drive about a mile and the check engine lights comes right back on and the Equinox goes into reduced power mode. The codes seem to come on together but I haven’t read anywhere where they are related.. I’ve throughly checked the intercooler and all hoses and pipes for vacuum leaks and everything looks good.
TPS and low boost codes??
- Thread starter Pujols5
- Start date
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Hey Vern!
Active member
I would start with the TPS. You should be able to check resistance with a multi-meter as you move the throttle plate. If it jumps around TPS is bad.
Hey Vern!
Active member
glad you sorted it out.Hi. It was the new intercooler. I purchased a cheap eBay intercooler and finally found where they hadn’t drilled the hole out inside the port for the boost sensor. I was mad and glad at the same timeThanks for your response!
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PoManNox
Active member
Awesome! Glad you got it sorted and followed up for us!Hi. It was the new intercooler. I purchased a cheap eBay intercooler and finally found where they hadn’t drilled the hole out inside the port for the boost sensor. I was mad and glad at the same time
I've seen 2-3 reports of the P0299 code reported in the past few weeks on 2018+ 1.5Ts.
What happened to the OEM charge air cooler if you don't mind me asking?