Skip the auto shop - Our mechanics make house calls

Q: Ocassional shifting problems

asked by on

I occasionally have shifting problems with the truck. Also, there is the service engine soon warning on. It sometimes wouldn't shift into drive. It shifts through the gears well, until put into drive. What could be causing this? The truck has Allison transmission and runs diesel.

Hello there, a few different faults could cause the vehicle to shift poorly. The most common would be low transmission fluid level, a shift solenoid, transmission linkage damaged, or a transmission range sensor. Always the first thing checked in any transmission fault is the condition and level of the transmission fluid. A qualified technician, such as one from YourMechanic, will be able to diagnose your shifting problem and perform any repairs required.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: transmission

This could be a lack of vacuum or potentially a bad shift solenoid. Most modern transmissions operate on vacuum actuated controls and solenoids both of which commonly fail at times which will cause the lack of or intermittent shifting problem...

Q: 2006 GMC 2500 HD P0101 Mass ari flow sensor (MAF) performance

The powertrain control module (PCM) sends the mass air flow (MAF) sensor a 12-volt reference signal. Incoming air flows over a wire inside the MAF, which allows it to measure intake air temperature, and therefore air density. The MAF then...

Q: Warning light intermittently appears when in Drive

Hello. If this problem started right after the CPU was replaced, then it is usually because it was not programmed correctly. If it was installed correctly and programmed, then the connections at the battery and the ground connections need to...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...