P0700 and p0742 code and hard shifting.

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03-12-2019, 01:35 PM

#11

Oldblue

Administrator

Join Date: 10-13-2011

Location: Welland,Ont Canada

Posts: 36,488

Sorry, it’s just, well my job to throw in logical safety stuff.
Im confident most know about these things, but you would be surprised how many don’t, so for those researchers looking here for guidance.

03-13-2019, 06:06 PM

#12

Tye

Thread Starter

Join Date: 03-05-2019

Location: Winston Salem NC

Posts: 8

So I took the transmission harness off and it looked like it got some atf in it somehow. So. I cleaned it with elec cleaner and let it dry. Hopefully that’ll help, it is the only compromised connection I could find. It the main Trans connection I think (big round plug). I haven’t commuted enough to tell a difference yet. I hope it fixed it

03-14-2019, 09:00 AM

#13

Tye

Thread Starter

Join Date: 03-05-2019

Location: Winston Salem NC

Posts: 8

Still not fixed

So the trans connection wasn’t it. Any chance it could be a shift solenoid inside the transmission case?

03-14-2019, 09:19 AM

#14

firemangeorge

Platinum Member

Join Date: 12-06-2009

Location: Alabama

Posts: 11,090

Probably not. Shift solenoid issues generally result in you "losing certain gears" so to speak. If it was a shift solenoid problem you would most likely generate a specific trouble code for that. The code you showed earlier pertained to a TC problem.
Did you see my earlier post where I mentioned the hard shifting may be from the CEL and NOT an actual trans problem ?

P0700 Transmission Control Module (TCM) Requested MIL Illumination
P0703 Brake Switch Circuit 2
P0705 Transmission Range (TR) Switch Circuit
P0711 Transmission Fluid Temperature (TFT) Sensor Performance
P0712 Transmission Fluid Temperature (TFT) Sensor Circuit Low Voltage
P0713 Transmission Fluid Temperature (TFT) Sensor Circuit High Voltage
P0716 Input Speed Sensor Performance
P0717 Input Speed Sensor Circuit Low Voltage
P0722 Output Speed Sensor Circuit Low Voltage
P0723 Output Speed Sensor Circuit High Voltage
P0741 Torque Converter Clutch (TCC) System - Stuck Off
P0742 Torque Converter Clutch (TCC) System - Stuck On
P0751 1-2 Shift solenoid (SS) Valve Performance - No First or Fourth Gear
P0752 1-2 Shift solenoid (SS) Valve Performance - No Second or Third Gear
P0756 2-3 Shift Solenoid (SS) Valve Performance - No First or Second Gear
P0757 2-3 Shift Solenoid (SS) Valve Performance - No Third or Fourth Gear
P0806 Clutch Pedal Position (CPP) Sensor Circuit Performance
P0807 Clutch Pedal Position (CPP) Sensor Circuit Low Voltage
P0808 Clutch Pedal Position (CPP) Sensor Circuit High Voltage
P080A Clutch Pedal Position (CPP) Not Learned
P0842 Transmission Fluid Pressure (TFP) Sensor Circuit Low Voltage
P0843 Transmission Fluid Pressure (TFP) Sensor Circuit High Voltage
P0856 Traction Control Request Circuit
P0961 Line Pressure Control (PC) Solenoid System Performance
P0973 1-2 Shift Solenoid (SS) Control Circuit Low Voltage
P0974 1-2 Shift Solenoid (SS) Control Circuit High Voltage
P0976 2-3 Shift Solenoid (SS) Control Circuit Low Voltage
P0977 2-3 Shift Solenoid (SS) Control Circuit High Voltage

03-14-2019, 10:08 AM

#15

donbrew

Technical Moderator

Join Date: 01-23-2009

Location: Fredericksburg, Virginia

Posts: 24,680

It could be the TCC solenoid, more likely wires or dirty fluid.

You might check the TCM end of the cable, some reports that the oil migrates uphill.

03-18-2019, 08:31 AM

#16

Tye

Thread Starter

Join Date: 03-05-2019

Location: Winston Salem NC

Posts: 8

10-4 I’ll check it this afternoon. It’s just crazy, I’ve clean every connection I can get to and followed the engine harness schematic I have with no luck.

03-18-2019, 09:29 AM

#17

Cat Man HHR

Senior Member

Join Date: 08-03-2010

Location: Lake Ronkonkoma, N.Y.

Posts: 3,564

If it's P0742 Torque Converter Clutch (TCC) System - Stuck On
My feeling would to look at/replace a faulty torque converter clutch solenoid valve.
We have seen shift solenoids go bad in the trans. Why not this solenoid ?

03-18-2019, 09:57 AM

#18

Oldblue

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Join Date: 10-13-2011

Location: Welland,Ont Canada

Posts: 36,488

A how to thread,

https://www.chevyhhr.net/forums/driv...olenoid-61313/

03-18-2019, 10:01 AM

#19

Cat Man HHR

Senior Member

Join Date: 08-03-2010

Location: Lake Ronkonkoma, N.Y.

Posts: 3,564

Blue that was a great thread. Don't know if this person is up to it to get to the TCC solenoid.

03-18-2019, 10:08 AM

#20

Oldblue

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Join Date: 10-13-2011

Location: Welland,Ont Canada

Posts: 36,488

But now they can see how it can be done and perhaps avoid the transmission shop telling him the whole engine and transmission has to be dropped out!.
Steve was kind enough to post pictures of his version of how to address a problem.
based on his pictures, I would suggest replacing all the shift solenoids at this time.
Now keep in mind, Steve has a lift in his shop, I’ve been there, met Steve, and he is a very knowledgeable HHR enthusiast.
Heck I’d prefer him working on my HHR then any dealership.