2. I had a P21dd - reductant heater 1 current low code. Cleared it and has not returned but only been 1 day. Not able to find much about what part would be the issue if this code returns. Looked at the gmdirect parts breakdown and it does not list the heater. Suggestions or ideas? _____
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I purchased a new 2006 GMC Sierra. I have had minor problems during mfg warranty. I purchased the optional service contract, $2,608.00 for 84 mo. or 100,000 miles through GM ...
CODE LIBRARY Enter your vehicle's make and the diagnostic trouble code shown on your innova tool to find out manufacturer specific information about the code being displayed.
I have a BlueDriver code reader and it showed the P21DD code. I reset it a couple of times but it kept coming back. ... In order to be able to post messages on the Chevy and GMC Duramax Diesel Forum forums, you must first register.

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In my experience Israel is right but that will only reset the oil life light. You will need to hook up a code reader to find out what is setting off the check engine light. Hopefully its something small to fix and then the light will reset. Just my experience I'm definitely not a mechanic.
I'm not at home now, so I'm not sure of the code. But that sounds like it. I've had the DEF heater replaced twice under warranty. I drove it for weeks the second time waiting for the dealer to get parts. As long as it doesn't get put into limp mode you should be fine. It only matters in freezing weather. The repair isn't rocket science.
So, went to the dealer. They had to replace the redundant heater. Not covered under manufacturer's warranty, but it was covered under my extended warranty (third party). Just had to pay the $100 deductible. no more than 2 hours after picking car up, CEL came on. Same code, P21DD. Back to the...

P21dd code warranty

Kennedy Custom Tuning for Duramax LB7, LLY, LBZ, LMM, and LML. Kennedy Custom tuning is developed in house by yours truly John Kennedy using EFI Live tuning software. It is my preferred way to improve power, economy, and drivability on the Duramax.Actron Diagnostics offers a code look up tool for your automotive diagnostic and scan tool needs. Use it here. Code Lookup | Actron Diagnostics & Mobile Scan ToolsI have a 2013 Malibu 2LT with 817 miles. Last Friday I got a CEL. I scanned the OBDii to find P262B. I couldn't find anything about this code other that being reserved by GM. They cleared the code and told me they could not find anything wrong and called the incident a "fluke!" This morning...Condition Code: 49 Service Procedure NOTE: For DTCs P21DD and/or P204C, this can indicate a concern with connector C3613. For DTCs P21CD and/or U02A2, this can indicate a concern with connector C4851. 1. Disconnect and inspect C3613 (16 pin connector) at the reductant pump/heater assembly and C4851 (4 P11DC Meaning The reductant system uses two Nitrogen Oxide (NOx) sensors to monitor the amount of NOx in the engine's exhaust gas. The first sensor is located at the outlet of the turbocharger and monitors the engine out NOx level.

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