Unfortunately, the knock sensors on these cars are very sensitive to heavy rain driving or to car washes. It seems water gets somehow to the sensor and it shorts it. Bad scenario as the intake manifold needs removed. Genuine sensor online are not that expensive. At hyundai be ready to spend quite a bit for this.

 

 

Same thing happened to me and im based in Canada as well. Had my engine replaced summer of 2022 and this year around April/May it occured to me twice.

After getting off the highway and going on the main road for a minute the check engine light started flashing and the car went into limp mode. Checked the code and it was P1326 and cleared the code and kept on driving it. A week later the same thing happened at the same exact spot.

Both days it was raining heavily. I took it to the dealer and they did the test and determined my engine wasn't knocking and recommended a new knock sensor to be installed. They wanted a crazy amount to do the so I declined.

No problems since so I'm thinking during the heavy downpours water glitched out the knock sensor.

 

Same thing happened to me and im based in Canada as well. Had my engine replaced summer of 2022 and this year around April/May it occured to me twice.

After getting off the highway and going on the main road for a minute the check engine light started flashing and the car went into limp mode. Checked the code and it was P1326 and cleared the code and kept on driving it. A week later the same thing happened at the same exact spot.

Both days it was raining heavily. I took it to the dealer and they did the test and determined my engine wasn't knocking and recommended a new knock sensor to be installed. They wanted a crazy amount to do the so I declined.

No problems since so I'm thinking during the heavy downpours water glitched out the knock sensor.

I'm curious, did they charge you to diagnose/check it?

Also, how much money did they want?

Maybe I'll just reset the code and keep driving, because it's clearly the heavy rain that causes it to trip.

 

Hello,

Similar situation. 2014 Hyundai Santa Fe Sport just under under 97,000 (less than 8k on new engine which was replace in March 2024). Ever since new engine it's received Mobile 1 Advanced triple action full synthetic oil every 3 months regardless of milage and premium gas.
When driving in heavy rain on the expressway/turnpike it suddenly went into limp mode on two incidents (12-29-24 & 6-5-25). P1326 code, flashing engine light & goes into limp mode. Both times at high speed and in the pouring rain. 1st time I dropped it off at Hyundai dealership and they looked at it a week later (they were crazy busy) & the active code "vanished" leaving the P1326 permanent code. Was told to "return with the engine light actively flashing & don't turn off engine". 2nd time I did so and they rain their tests in the back and documented the active codes and whatever else it told them to prove I wasn't nuts the first time. 3 weeks later my SUV is still at the dealership, Hyundai has ruled out any rod bearing issues in the new engine, oil level is good and knock sensor seems to be functioning correctly. I suggested maybe the knock sensor has a short or something. All they can say is if they replace it, since it's now out of warranty from them replacing during a recall bulletin years ago, it would now be my responsibility. Other than that, they have zero recommendations on what could be causing the code. They said they'd replaced the knock sensor, but at my cost ($700) since out of warranty. I don't want to do this and the process reoccur. Has replacing the knock sensor for anyone else worked?? Could the current knock sensor just need adjusting? Software update?? Any help is appreciated.🙏

 

Kind of late now, but Moe should have knocked the CHEEZIE layer of paint off the pad where the knock sensor resides (HRM engines is quick wash, and spray painted with CHEEZIE silver paint that runs off if gasoline spilled on it (dont ask how I know), and the holes on block are not cleaned out, the knock sensor pad dirty and painted over.

Tell them to remove the intake and injector rail, and clean the knock sensor pad to clean aluminum, and chase the bolt hole with nice sharp 8x1.25 tap and blow the trash out of the hole

Wire wheel the bolt so the threads is clean, and install knock sensor onto the clean pad, torque the bolt to 15 lb-ft (they ideally should know this & NO POWER TOLLS)

Re-assemble injector set with new 2B110 washers and fuel pipe, and re-install intake manifold, and DONT FORGET THE BRACKET & 4 BOLTS to support the intake !!

Clear codes with GDS, reset engine adapt and E-CVVT learn

 

I ended up replacing the knock sensor end of June 2023. Ever since then no more issues when driving in the rain or in the car wash.

 

Thank you all for your input. They said they checked the knock sensor & there's "no corrosion or failure present". @Dog Patch Steve I will show them your message above & see if they'll do all you said. If they won't, will replacing the knock sensor generate similar actions that you described? Sorry. I don't understand the majority of what you wrote. 😓

 

I ended up replacing the knock sensor end of June 2023. Ever since then no more issues when driving in the rain or in the car wash.

Thank you all for your input. They said they checked the knock sensor & there's "no corrosion or failure present". @Dog Patch Steve I will show them your message above & see if they'll do all you said. If they won't, will replacing the knock sensor generate similar actions that you described? Sorry. I don't understand the majority of what you wrote. 😓

Yes, replacing the sensor fixed my issue. Had to pay out of pocket.