Skip the auto shop - Our mechanics make house calls

Q: "No bus" code

asked by on

My truck wouldn't start and the fuel pump wouldn't do anything so I changed it , went to start it. It cracked but would not start and the dash went dead and the mileage started flashing "no bus" I did not notice this before but I already had assumed it was the fuel pump. I checked some connections but don't really know where to start or what to look for. Can you walk me through diagnosing and finding the issue? Thanks

My car has 140000 miles.
My car has an automatic transmission.

A: When the No Bus message appears in your ins...

When the No Bus message appears in your instrument cluster, its usually an indication that there is a problem with the powertrain control module or the wiring to it. This is also very likely the cause of your no start concern. You will need to have the PCM tested as part of diagnosing the no start condition by a qualified technician, such as one from YourMechanic. If you want to try diagnosing the issue yourself, you could first try swapping the PCM with a known good unit with an identical part number from another vehicle and see if that helps.

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: Radiator fan scrapes against shroud, car won't idle.

Hi there. The cooling fan could be coming apart hitting the shroud or the shaft could be bent. The stalling of the engine could be caused by the computer shutting off the engine due to a vibration that the knock...

Q: battery drained and truck not starting

Hi. The battery light indicates a problem in the charging system. It does indeed sound like your alternator has failed and your battery is discharged. The battery is basically a storage device that must be continuously charged by the alternator....

Q: Car overheats; coolant leak

If the engine got hot enough to cause a head gasket failure then all of these other parts must be replaced with it. I typically do a block test to verify that the head gasket is bad. If it is...

Related articles

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...