2017 GM 2500HD Reductant System Problems P20E8 @PhillipBailey
2017 GM 2500HD Reductant System Problems P20E8  @PhillipBailey
Uploaded February 2025 | Updated September 2026, 2 weeks ago
This 2017 GMC 2500HD L5P had a P20E8 for low Reductant System pressure. I found that the system was empty. Then two professional scan tools would not command the pump to run properly. I had to use GDS2 to test it properly. It may have been frozen.
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Phillip Bailey |

2017 GM 2500HD Reductant System Problems P20E8

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