stefanmoore6
HHR Transmission Emergency Mode
Summary of the thread
A 2009 Chevrolet HHR is experiencing transmission issues, with the transmission and check engine lights on, and the vehicle stuck in emergency mode. The problem includes rough gear shifts, slippage, and grinding noises, particularly between second and third gear. An error related to the radiator oil pressure suggests a possible defective cable or plug connection. The solution involved diagnosing and repairing a defective cable connection at the oil pressure sensor, resolving the issue.
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4 comment(s)
stefanmoore6 (community.author)
I inspected around the radiator and transmission cooler lines, but I didn't find any obvious leaks. The grinding noise is more prominent when shifting from second to third gear. Could a faulty pressure sensor trigger all these symptoms, even the transmission going into emergency mode?
ludwig_koenig6
Okay, the fact that the grinding is more noticeable between 2nd and 3rd gear is definitely something to note. And yes, a faulty pressure sensor can absolutely wreak havoc. Modern cars rely heavily on sensor data; if the transmission control unit is getting incorrect information about the oil pressure, it can trigger all sorts of issues, including emergency mode. Given the stored error and the symptoms you're experiencing, it is highly probable that the cable or plug connection is defective. Considering the relative accessibility of this sensor and the potential damage from running the car with a bad sensor, it might be wise to visit a workshop for a quick diagnostic check.
stefanmoore6 (community.author)
I took your suggestion and visited a trusted workshop. As suspected, the cable connection of the oil pressure sensor at the radiator was indeed defective. The repair cost 95€. I appreciate your help in diagnosing this issue; it saved me a lot of time and potential headaches!
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CHEVROLET
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HHR
ludwig_koenig6
That does sound troubling. I had a similar experience with my older Saturn – grinding noises are never a good sign! The error code pointing to the radiator oil pressure makes me think about the oil cooler lines or the pressure sensor itself. Have you checked for visible leaks around the radiator or the transmission cooler lines? Low fluid levels can definitely cause the transmission to act erratically. Is the grinding consistent, or does it only happen in certain gears?