View Full Version : I dont understand what this means....

02-17-2004, 07:33 AM
Well i found out what code is flashing on my "Service Engine Soon" Light is telling me, but i dont have a clue what it means

Code 54 - M/C Solenoid Check All M/C Solenoid and ECM wires and connections. Replace with new Unit.

I was wondering if some one could break this down in to a little more simple terms for me..


An enemy of my enemy is my friend!

02-17-2004, 07:10 PM
emc is elecontric control module....= VERY EXPENSIVE

FU Toolbag
02-18-2004, 05:13 AM
It might help us out a bit if we knew what vehicle and engine ect it was. I used to have a ford escort that came up with the same code. over $600 in electronic shit and wards found out it was a $25 relay. Those dam "smart" snapon tools.

Actuall 4X4'er
No heeps allowed
Off Camber

02-18-2004, 06:00 AM
Its a 1991 S10 Blazer, 4.3L, 5 speed standard....

An enemy of my enemy is my friend!

02-18-2004, 07:24 PM
Never heard of a code 54, I'll try to remember to look it up tomorrow at work.

02-18-2004, 07:35 PM
code 54 is fuel pump (volts low)

02-20-2004, 07:41 PM
Pumpkin's right, the PCM has sensed a condition of no voltage to the fuel pump. Schematic looks like it looks for a signal after the fuel pump fuse. Does the truck die on you, or is the check engine light just coming on?

02-24-2004, 10:32 AM
Its just super hard starting but once its running theres absolutly no problems...

it started with a leak in my gas line.. and i fixed that.. and its still hard starting....

An enemy of my enemy is my friend!

02-27-2004, 07:06 PM
If it takes a lot of cranking to get it started especially first thing in the morning, then it probably is losing it's prime. Try priming it a few times (cycle the key a few times from off to run, don't crank it though) which should run the fuel pump for a few seconds each time. If it starts after cycling key a few times, then you're pumps probably leaking back into the tank when it sits overnight. If this doesn't help, then use a test light and check for power and ground at the pump connection when cranking.