GMC TSB #N212342980
2021 GMC Sierra 2500
Affected Component: ELECTRICAL SYSTEM
- Summary
- On certain vehicles equipped with a 6.6L diesel engine (RPO L5P), the DEF tank connector may overheat and set the following diagnostic codes (P10D9, P143C and P10F3), which will result in reduced engine speed. Dealers are to reprogram the reductant control module.