Hi all,

I have a 2005 Ram with 5.3L Hemi. The Tachometer works intermittently and when the needle does move it is inaccurate. I am trying to find out how to troubleshoot this. I cannot find info on where it receives its information or how to determine if the guage is faulty. Any pointers would be greatly appreciated.

 

Wish I had an answer for you... I just brought an 06 Ram 1500. The break light and ABS light is on. The Speedometer works but the tachometer doesn't. My mechanic plugged in this scanner and got the c1036 (rear speed sensor) code... the strange thing is when he tried to deleat the code the tach started to work. As soon as he unplugged the scanner the lights remained on and the tach stopped working again. Strange... replacing the sensor didn't help.

 

The tachometer on your 2005 Ram gets its signal from the engine control module (ECM). It measures the engine’s RPM by using data from the crankshaft position sensor. If the tachometer is acting up, here are a few things you can check:

Wiring and Connections: Inspect the wires going to the tachometer and the ECM. Look for loose or damaged connections.
Crankshaft Position Sensor: If this sensor is faulty, it can cause tachometer issues. You may notice other problems, like the engine running rough, if this is the case.
Cluster or Gauge Issue: The tachometer itself could be faulty. Some people take the gauge cluster out and check for broken solder joints or replace it if needed.
Scan Tool: Use a diagnostic scan tool to check for error codes. This can help pinpoint if the issue is with the sensor, ECM, or gauge.
If you’re not comfortable with these steps, a mechanic can help figure out what’s wrong. Good luck!