Recently I was driving and noticed my hummer wouldn’t shift into 3rd gear. Took it to shop and had it diagnosed. End result was rebuilding transmission. AFTER I received it back within two days I noticed that it wouldn’t gift out of 3rd. Once it shifted into 3rd it would still accelerate but it would be taching 3500 or so rpms. Check engine light came on so I took it to local parts store and had the codes ran. Below is a photo of the codes. Notified the transmission shop I took it to and he said “you need a THROTTLE POSITION SWITCH, THROTTLE BODY” ... my argument I I took it to him with NO throttle issues or codes but TRANSMISSION codes and issues. Any idea what I need to do and or go about trying to get my H3 back on the road. Thank you in advance

These are the ONLY codes that popped up and he’s telling me that I need a new Throttle position switch, throttle body and claims the bad throttle body is what messed up my transmission in the first place..

 

P0700 code definition

P0700 is a generic OBD-II code that is indicating a fault within the transmission control system. This code may be seen with shift solenoid codes or other transmission codes.

P0741: Torque Converter Clutch Circuit Performance or Stuck Off DTC Trouble Code

Having a P0741 DTC means the ECU has detected an issue with the performance of the torque convertor clutch solenoid.

How Serious is the Code?

The P0741 OBD2 trouble code indicates that the torque convertor clutch can’t disengage, so performance can suffer and transmission damage can occur.

Symptoms

Symptoms of a P0741 include:

• Check engine light
• Harsh, delayed or erratic shifts
• Engine stalls
• Transmission shudders/shakes when coming to a stop or accelerating
• Getting stuck in gear
• Vehicle won’t move when in gear
• Reduced fuel economy
• Transmission overheats

Causes

• Low transmission fluid
• Dirty transmission fluid / filter
• Frayed wiring / damaged connectors
• Failed torque convertor clutch solenoid / TCC solenoid
• Failed torque convertor and/or clutch assembly
• Pressure blockage
• Valve body issue
• TCM failure

How to Diagnose the Code?

To determine what is causing this DTC, a mechanic should first assess the condition of the transmission fluid, as dirty ATF can keep the TCC solenoid from working properly. The wiring and connectors should also be inspected for damage and corrosion. If no issues were found by this stage, then the torque convertor and TCC solenoid will have to be tested.

Common Mistakes When Diagnosing

It’s not uncommon to assume that the torque convertor itself needs to be replaced/rebuilt, when it could just be a faulty TCC solenoid or dirty/contaminated transmission fluid.

What Repairs Will Fix P0741?

• Replace the torque converter clutch solenoid
• Replace the torque converter or clutch
• Change transmission fluid and filter
• Repair/replace damaged wiring and connectors
• Repair/replace TCM or ECU
• Install a rebuilt or remanufactured transmission

 

Thank you for this information. So basically it sounds like this mechanic is just trying to get me to purchase the throttle body and or throttle position sensor/switch for NO reason. I was gave a 3year UNLIMITED mile warranty when he rebuilt my transmission and within the same week my check engine light came on and those were the codes that were pulled. SO looks like he’s going to be fixing the issue, Bc it should have been resolved when he replaced,upgraded my transmission correct?

 

The codes you showed are not related to any (TPS) Throttle Position Sensor issues.

Might have a bad (TCM) Transmission Control Module?

 

That is correct.
You took it to a shop and they diagnosed. You agreed to have it repaired and paid the shop. The shop did not repair properly. The shop should repair @no additional charge to you. Take it back to the shop and let them know to, check fluid level, test/command the tcc solenoid, check/secure connectors, and if all else fails, replace the torque converter. GL