A 2007 Pontiac G6 with a transmission that won’t move the car can be a frustrating experience. This issue could be caused by a variety of problems, ranging from simple fluid issues to more complex mechanical failures. Here’s a step-by-step guide to help you troubleshoot this issue⁚
1. Check the Transmission Fluid
The first step is to check the transmission fluid level and condition.
- Level⁚ With the engine running and the car on a level surface, locate the transmission dipstick (usually near the back of the engine). Remove the dipstick and check the fluid level. It should be within the “Full” markings on the dipstick. If it’s low, add the correct type of transmission fluid (consult your owner’s manual for the recommended type).
- Condition⁚ The transmission fluid should be a bright reddish-pink color and have a slightly sweet smell. If it’s dark, burnt, or smells like something is burning, this could indicate a problem with the transmission itself.
2. Check for Transmission Codes
If the fluid level is good and the fluid looks healthy, the next step is to check for transmission codes. These codes can provide valuable insight into what’s wrong with the transmission. You can use an OBD-II scanner to read the codes.
- Common Transmission Codes⁚ P0700, P0740, P0750, P0760, P0770, P0773, P0780, P0783, P0785, P0790, P0793, P0796, P0840, P0841, P0842, P0843, P0844, P0845, P0846, P0847, P0848, P0849, P0850, P0851, P0852, P0853, P0854, P0855, P0856, P0857, P0858, P0859, P0960, P0963, P0964, P0965, P0966, P0967, P0968, P0969, P0970, P0971, P0972, P0973, P0974, P0975, P0976, P0977, P0978, P0979, P0980, P0981, P0982, P0983, P0984, P0985, P0986, P0987, P0988, P0989, P0990, P0991, P0992, P0993, P0994, P0995, P0996, P0997, P0998, P0999.
3. Check the Transmission Solenoids
If the transmission fluid is good and there are no codes, the problem could be with the transmission solenoids. These solenoids control the flow of fluid within the transmission, and a malfunctioning solenoid can prevent the transmission from shifting properly. You can test the solenoids using a multimeter or by replacing them with known good ones.
4. Check the Torque Converter
The torque converter is a fluid coupling that connects the engine to the transmission. If the torque converter is damaged or faulty, it can prevent the transmission from engaging. This is a more complex problem that usually requires a transmission specialist to diagnose and repair.
5. Check the Transmission Control Module (TCM)
The TCM is the computer that controls the transmission. A faulty TCM can cause a variety of transmission problems, including the transmission not moving. This is usually a difficult issue to diagnose and repair, and often requires replacing the TCM.
6. Check for Mechanical Issues
If all of the above checks are done and the problem is still present, there could be a mechanical issue with the transmission. This could include worn gears, a broken clutch pack, or a damaged valve body. This type of issue usually requires a complete transmission rebuild or replacement.
Important Notes
- If you are not comfortable working on your car, it’s best to take it to a qualified mechanic for diagnosis and repair.
- Be sure to use the correct type of transmission fluid for your G6. Using the wrong type of fluid can damage the transmission.
- If you suspect a mechanical issue with the transmission, it’s important to have it repaired as soon as possible. Driving with a damaged transmission can cause further damage and lead to a costly repair.