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  #1  
Old 11-22-2011, 09:08 AM
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Default Transmission light

My trans light just came on today, what does it mean? I have a 2005 hemi, had it for a couple months now with no obvious problems. Any help or advice would be great!
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Old 11-23-2011, 08:00 AM
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What trans light? The check engine light? Or the trans overtemp light (a gear with a thermometer over it)?

How were you driving it? Have you had your dealer check for any fault codes (and if so, what codes did it have)?
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Old 11-23-2011, 09:48 AM
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If it's a check engine light then autozone will scan it for free, you can then post the code and we can help. If it's any other light I don't think a regular OBD2 scanner will work and you'll have to go to the dealer to get it scanned.
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Old 11-23-2011, 10:10 AM
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The check engine light (which is officially known as the Malfunction Indicator Light or MIL) will illuminate for any fault which "affects emissions." These are typically engine or trans faults, but could also include other faults such as transfer case control module faults.

Most generic scan tools will only read faults from the engine control module (ECM). Thus, if you have a fault set in the trans control module (TCM), you can often read it only with a dealer (or other specialized) scan tool. For this reason, many of our trucks will set a P0700 code (TCM Fault Present) in the ECM, whenever a TCM fault is set. This is just a flag that tells you there is a fault set in the TCM (so you have to get a special scan tool to read it). This avoids confusion that would occur if the MIL were lit but there were "no faults" showing in the ECM.

Now having said that, most (if not all) of our gas-engine trucks (2003 MY and later) use a combined Powertrain Control Module (PCM), which is the ECM and TCM all combined into one unit. So there are no longer "ECM" and "TCM" faults. Engine and trans faults are both "PCM" faults now. Most generic scan tools should be able to read your PCM faults, so if you have trans faults they should show up on a generic scan.
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Old 11-23-2011, 10:18 AM
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^ good info there.
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