Q: Possible issue with the shift solenoid or TCM?

asked by on

My 2007 mazda 3 2.3 automatic is hard shifting followed by the AT light coming on. Hooked up to computer at O'Reilly and code is saying shift solenoid. Took to dealership they say transmission control module. Big difference in price, is dealer trying to take advantage of me? The guy I talked to at dealer didn't sound like he knew the difference

My car has 188000 miles.
My car has an automatic transmission.

It could be either one and it’s impossible to say without inspecting the car. The difference between the O’Reilly diagnosis and the dealer’s is probably one of equipment. O’Reilly uses a generic OBD-II scanner and the dealer should be using a factory designated unit. The difference in the information available to the different scanners is pretty big.

Additionally, the dealer has access to a database of failures in previous cars that are similar to yours so they may be diagnosing based on a pattern of failures. That doesn’t mean the dealer’s diagnosis is always right. It just means they are working from a bigger toolbox.

It wouldn’t hurt to get a third opinion, you can get one at home, by having Your Mechanic send a technician out to read your car’s diagnostic system and interpret the codes for you. Best of luck!

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Possible issue with the shift solenoid or TCM?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Clutch slipping on manual transmission

Unfortunately, the Mazda clutch is a hydraulic system that has no adjustments. If the clutch is slipping the clutch disc is most likely either worn or the pressure plate is faulty. The clutch system will need to be inspected and...

Q: No crank no start at witts end

This sounds like potentially a faulty starter solenoid. Try checking for power to the solenoid. The clicking sound is common sometimes when the battery is weak, but is also a common sign of a faulty starter solenoid. Have a qualified...

Q: I think my cars transmission is going out

Hello. Grinding noises at high speeds could be related to wheel bearing or transmission issues. This type of problem may be difficult to diagnose without test driving the vehicle to determine whether or not it is worth fixing. A certified...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...