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RAM 2015 SERVICE DEF SYSTEM MESSAGE UPDATE
So I wouldn't be surprised if at some point there's a firmware update to prevent the secondary problem I was having. That sounds to me like the ECM isn't programmed to deal appropriately with out-of-range data from the sensor. They told me that a malfunctioning temp sensor can confuse the Electronic Control Module, resulting in all kinds of problems. Our first year, I think we went several thousand miles without using any DEF. In that kind of weather, I suspect the temp sensor signals the ECM to turn on the heater, but if the temp is still too low, it probably tells the system to ignore the DEF rules regarding bad or low fluid level. When the high temp is < 10 degrees for a couple of weeks, driving 5-10 miles isn't likely to thaw the DEF, which is mostly water. I know from our past experience in Colorado winter weather that the DEF tank can stay frozen for an extended period. I'm not positive, but I think the GMC part called the Reductant Tank may actually be the pump that draws fluid from the holding tank and supplies it to the exhaust stream. I think there is a heater involved along with a temperature sensor so that the vehicle can work properly in below-freezing temps. Reductant is apparently a generic term for the UREA (and in other applications other compounds) that reduce Nitrous Oxide emissions by injecting the fluid into the exhaust stream. The sensor can't be replaced separately from the tank.įrom the parts diagram they showed me, the reductant tank is above the tank that holds the DEF fluid. The temperature sensor on the reductant tank was malfunctioning. That put the whole thing into the "pretty special" category for me.
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The GM Regional Rep to whom the incident had been escalated called a few minutes ago to apologize for the inconvenience, and to offer me a $100 service coupon good at any GM dealer. But as it turns out, that's not the end of the story. We just had to deal with some pesky error messages, and GMC covered all the diagnostics and repair work at 46,000 miles. But as it turned out, everything was covered under warranty. I showed up at 8 and had the truck back at 10:30.īecause of what I'd read on the Duramax Diesel Forum that some people are being charged $1000 for this repair, which it turns out is fairly common, I had read up on the emissions warranty coverage and was ready for a discussion. Sure enough, on Tuesday, the dealer called and we set up an appointment for this morning. They called back the next day and said the part should arrive at the dealership by Monday or Tuesday. I didn't ask her to but the customer service rep said she was going to escalate the situation to higher management. GM called back that afternoon and I shared what the dealer had told me. They told me it was backordered nationally, so they didn't have a projected date when it would arrive. The GMC dealer did another diagnosis and ordered a Reductant Tank, which is the only way to replace the bad sensor. In the meantime, GM Customer Service called back to follow up. I made an appointment with Hudson GMC in nearby Silverthorne. And the next day the Check Engine light reappeared. Just as we were pulling in to Tiger Run Resort, a new Diesel Range 900 message popped up. That delayed our departure by 2 hours, but we got to NE Colorado that evening and made it to Breckenridge the following day. They covered it under the emissions warranty, but told me that they really were supposed to bill me. They did that and also reset the ECM to clear the error codes. Husker GMC in Lincoln thought that forcing a particulate burn might clear it up. Since we were coming into Lincoln, NE, they arranged for the dealer there to look at the truck first thing in the morning. I called OnStar and they transferred me to GM Customer Service. This one meant that the messages were erratic and we could get stranded on some lonely stretch of road in western Nebraska. Wrong! Less than an hour later I got another message. I figured since it was a bit under 800 miles to Breckenridge, I'd get it taken care of there. When you're out, speed gets limited to 4mph. If you ignore the warning, around 100 miles, speed gets limited to 55mph. A few miles down the road I got a DEF Range 900 miles warning. On the way from Goshen to Breckenridge, CO, while filling up on diesel, I filled the Diesel Exhaust Fluid tank at a Flying J ($2.69/gal), putting in 3.1 gallons. Just to make sure there was nothing else hiding behind the check engine light, I used OnStar to run remote diagnostics before starting out every day.
RAM 2015 SERVICE DEF SYSTEM MESSAGE CODE
I pressed the OnStar button to run remote diagnostics and they explained it was a "Reductant Tank Temperature Sensor error" ( error code p205) and that I could have it fixed at my convenience - end of summer would be fine. On the way to the Goshen Rally, our 20 started throwing a Check Engine Light. This story just has too good an ending to not share.