Skip the auto shop - Our mechanics make house calls

Q: Truck shut off while going down a hill

asked by on

My check engine light never goes off. When I go over 55 for a constant time the check engine light blinks. When coming down a hill towards a stop sign today the truck shut off and would not start back up. It's never stalled or sputtered before. All electronics still work and truck tries to start. Sounds like it is out of gas even though it is not. Wasn't sure if it was possibly a crank shaft sensor or fuel pump. Input is appreciated.

My car has 170000 miles.
My car has an automatic transmission.

A full diagnostic would be needed to identify the issue. A key to that effort will be reading the diagnostic trouble codes that have set the Check Engine Light on.

With those codes and a few quick tests, it should then be relatively easy to find the fault. In particular, the crankshaft position sensor should be tested for functionality.

If you suspect the fuel pump has gone bad or has totally failed (or if it has beed disconnected due to a wiring/terminal fault), you can check its condition by having an assistant turn the key to the "On" position as you listen back at the tank for the characteristic noise. There is a momentary "whirring" sound that the tank pump will make as it turns on and pressurizes the fuel system prior to ignition. If there is dead silence at the instant the key is turned "On", then there is an problem with the circuit or the pump itself.

If you would like to have the stalling problem diagnosed by an expert, a certified technician from YourMechanic can come to your car’s location to inspect the issue and move forward with repairs.

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: Hello Chris, I have had a problem with my rear passenger side tire that wobbles?

There are many suspension parts that can cause your wheel to wobble. Some of these parts include ball joints, tie rods,idler arm, pitman arm, wheel bearings, and control arm bushings. I would recommend having your front end shook down to...

Q: why is my van heater not working

There are several issues that can be the cause of this. The most likely is, unfortunately, the heater core. You may have to replace the entire unit if that is the case. With that said, you should always start with...

Q: When the weather is nice outside, the car start fine. When it is cold, the car refuses to start until I try it several time

Hello, the first step in resolving this problem is to determine if there are any problem codes set by engine management - even if the Check Engine light is not illuminated. Most auto parts supply stores will check this for...

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...
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...