Skip the auto shop - Our mechanics make house calls

Q: Cranks but won't start

asked by on

Truck just shut off no warning no nothing im told it could be auto shut down relay how do I confirm that I tried using a decoder but being told the vehicle must start also need to know if I should just buy the computer or try eliminating the sensors.

My car has 180000 miles.
My car has an automatic transmission.

A: This may happen for many reasons. There are...

This may happen for many reasons. There are in fact modes in your truck’s computer that will trigger the ECU to shut the engine down in the event of some kind of failure that may cause major damage. This is a fail safe measure that is taken by the ECU when it detects critical components that may be not functioning properly or something that could jeopardize the safety of passengers or the engine.

Without power to the ECU itself, it my be difficult to use a scanner, however this can be bypassed, but does take a bit of skill. I would suggest having an expert from YourMechanic come to your home to diagnose your no power issue.

Was this answer helpful?

A: Hello, thanks for writing in about your Dod...

Hello, thanks for writing in about your Dodge Ram 1500. I’m curious if your Check Engine light on. Checking the basics will help here: will it crank but not start? If so, is there spark at the plugs and does spritzing some starter fluid result in a brief engine start? Check fuel pump and ignition fuses and relays - a hard shut-down was a clear failure of some kind.

If you need help with this issue, I would recommend having your no start condition inspected by a certified technician, such as one from YourMechanic, to diagnose this problem, get an accurate assessment of damage and cost estimate for repairs. YourMechanic can dispatch a mobile, professional mechanic to your location for this repair.

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: Car won't crank after an engine swap project

The problem with swapping engines is that these type of fitting issues tend to happen more often than not. In most cases, the flywheel is not properly aligned with the starter or transmission; causing the starter to not engage correctly....

Q: Clutch doesn't work

The clutch master cylinder supplies pressure from your foot to the clutch slave cylinder. A fluid leak at the master or the slave cylinders would indicate the problem. I would recommend inspecting the fluid level and adjustment. A fluid bleeding...

Q: Multiple trouble codes, no spark, no start.

You are getting codes to each and every major sensor on the engine that is needed to run your motor. You either have a major malfunction with the ECU or a problem with the harness not being wired correctly. You...

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...
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...
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.