Q: Transmission in safe mode

asked by on

The transmission is in safe mode. I think the speed sensors are bad.

It could be that the speed sensor is bad. The transmission will go into limp or safe mode when it loses one of its main inputs, such as the transmission speed or transmission range sensor. It may also go into limp mode if there is problem with one of the main outputs, such as a shift solenoid, or if there are internal transmission mechanical problems. When in limp mode, the transmission control module (TCM) will cut power to the transmission control relay and de-energize the shift solenoids. This makes the transmission limited to only 2nd or 3rd gear. I suggest calling a professional, such as one from YourMechanic, to diagnose and repair this problem for you.

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. Transmission in safe mode

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: Stalling when slowing down, jerking, sluggish engine

You may have a fuel pump or fuel pressure regulator issue. All of the symptoms you described are possible with a faulty fuel pump. However, the more likely cause in this situation would be the fuel pressure regulator. The...

Q: Clutch shifts hard

Hello! From your description, it sounds as if you have a hydraulic issue. I suggest that a technician drive the vehicle to perform a clutch performance test. The clutch performance test will help indicate whether the clutch itself is faulty, or...

Q: Q: Car shaking when driving

Fuel injector cleaner typically will not affect anything in cars as it is formulated for modern vehicles and is safe for all sensors. The issue may have started right after you added the cleaner, but my suspicion is that it...

Related articles

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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.