I have a 2004 model blazer the service engine soon light is always on when the ignition is on. The main problem now is that the speedometer analog is not reading while the digital reads and the engine works very fine, the transmission doesn't select and remains on high gear even on high RPM. kindly assist please.
This dash is a "push-in" dash panel. There was a lot of trouble with the connections on the panel. They get corroded and don't make good contact. Remove the instrument cluster, spray the connections with electro-motive spray. Maybe even some very fine steel wool (with the battery disconnected!) and get the terminals clean. Re-assemble. It should work GREAT. Hope this helps.
SOURCE: transmission,and speedometer,check engine light problem
I found the information,as I searched a little further on the Internet,it turns out to be a fairly common problem which is, the speed sensors with the outlet being the most common one to fail but the inlet can also, a relatively cheap fix.
SOURCE: Replaced rear differential speed sensor
Did you use a mopar sensor.I have fixed this problem many times and not had much luck with the aftermarket sensors.Just a thought.Good Luck!!!
SOURCE: Honda 2004 transmission gear box
Hi sounds like a problem I was starting to have in my 04 Accord. It would shutter terribly between gears. We had changed trans. fluid every 60k miles but evidently that wasn't good enough. I was shopping for a trans when I talked to my mechanic and he recommended new fluid. We drained and refilled trans twice and now drain and refill trans pan every other oil change ( about 20k w/ synthetic). After the fluid change trans. is doin great. Don't run and go pay for a trans flush at a local shop. I worked at a very highend dealership as a service writer and trust me it is a rip. In your honda you have drain plug just drain and refill, then run, repeat. It will do the same thing just takes a little longer. I have 190k on "The 04" now and it just won't quit! Honda's Rock!
SOURCE: transmission doesnt shift abs & brake light on speedometer doesnt work
I had the same problem with ABS light and speedometer, I was told that it is the transmission control module. It has not yet stopped shifting but I have had times where it just wont stay running. It will start and then stall. Hope this helps.
SOURCE: 1999 plymouth voyager 3.0 V6
your trans is in limp mode disconnect battery reconnect see if it reoccurs check trabs computer and all sensors
Step
Action
Yes
No
Schematic Reference: Instrument Cluster Schematics
1
Did you perform the Instrument Cluster Diagnostic System Check?
Go to Step 2
Go to Diagnostic System Check - Instrument Cluster
2
Does the Vehicle Speed Sensor parameter match the speedometer display?
Go to Step 3
Go to Step 4
3
Does the odometer operate properly?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
Go to Step 4
4
Replace the IPC. Refer to Instrument Cluster Replacement .
Did you complete the replacement?
Go to Step 5
--
5
Operate the system in order to verify the repair.
Did you correct the condition?
System OK
SERVICE VEHICLE SOON
The IPC illuminates the SERVICE VEHICLE SOON in the following conditions:
?€¢
The BCM detects certain malfunctions in the lighting system. The IPC receives a class 2 message requesting illumination from the BCM.
?€¢
The IPC detects a loss of class 2 communication with the BCM.
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