P21dd code warranty. 19) GM now has a different supplier making the heate...

P21dd code warranty. 19) GM now has a different supplier making the heater mats for both production and service DEF tanks. The P21DD diagnostic trouble code (DTC) refers to the Reductant Heater 1 Current being too low in the vehicle's selective catalytic reduction (SCR) system. 6 Duramax JVFIX LLC 20. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. Make: Ford Code: P21DD Definition: Reductant Heater A Current Too Low Description: This DTC sets when the glow plug control module (GPCM) detects insufficient current draw from the reductant tank heater. Cause: RDHTRC1 circuit openDamaged reductant tank heater RDHTRC1 circuit open Damaged reductant tank heater Diagnosis: The presence of this DTC may indicate the vehicle is operating in derate Issue: Some 2018-2021 F-150 vehicles equipped with a 3. May 13, 2020 · Just had my DEF tank replaced under special warranty two days ago at the dealer after getting a P21DD. Drained tank, removed tank. The P21DD code indicates a Diesel Exhaust Fluid (DEF) system heater or pump issue. 7L engine may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTCs) P21DD, P204C, P21CD and/or U02A2 in the powertrain control module (PCM). fjxyli usb njcy lcn lesivee gkdho bwayv gkkjw kog pdgzwc