Skip the auto shop - Our mechanics make house calls

Q: My titan recently began to shutter while I was accelerating. When it stopped I couldn't get it to go faster than 40mph.

asked by on

I had come off the freeway having traveled about 70 mph. As I was going down the off ramp my Titan jolted suddenly and I lost power. After that I couldn't get the speed up past 40mph. There is a moaning vibration sound which seems to be coming from the area of the transmission.When I park the truck and come back later to drive, it runs o k. Unfortunately as I drive for a few minutes the jolt comes back and I can't get the truck to go faster than 40. Could this be do to low transmission fluid?

My car has 135000 miles.

A: My first thought is, what code is the TCM (...

My first thought is, what code is the TCM (transmission control module) setting? Usually when a vehicle won’t go faster than 40 mph, the vehicle has set itself into limp mode. It does this to protect itself from what it perceives to be greater damage. To begin to figure this out, a scan tool will need to be connected to retrieve codes and to observe the relevant data. Keep in mind, a code reader that is used at your local part store will not be sufficient. If you have access to such a tool and want to learn, connect it to the OBD-II connector and give it a shot.

In my research for the Titan, there is quite a bit of information about TCM reprogramming. Either the TCM’s are failing or they are needing what is called a reflash to fix your problem. Either way the TCM will need to be reprogrammed and this will require Nissan software to make this happen.

If you want to have this looked at by a professional, a certified technician from YourMechanic can come to your car’s location to diagnose your vehicle’s loss of power, scan for any codes, and determine what repairs will be necessary.

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

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: Vehicle whining after belt replacement

Hi there. I would suspect another pulley that the serpentine belt drives has a dry/loose bearing. Have a certified mechanic, like ones from YourMechanic, inspect the noise and check each pulley for play.

Q: Pickup is running rough, jerking, stalling, and not idling over 3000 rpms

Hey there. This sounds like an air/fuel delivery problem which may be a result of a dirty or failing mass air flow sensor. This may also be a result of a failing O2 sensor which may also cause an incorrect...

Q: Transmission not engaging

Hello. If the shifter is moving fine and the truck responds to the shifter position but does not move when the transmission has more than likely failed. If there is no response at all, then it may be the shift...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...