# 2020 GMC SIERRA 1500 — ENGINE
> NHTSA complaint `2238983` · 2026-08-24 · General Motors, LLC
## Severity
- **Deaths:** 0
- **Injured:** 0
- **Fire:** No
- **Crash:** Yes
- **Police report:** Yes
- **Medical attention:** No
- **Vehicle towed:** No
## Vehicle
- **Make:** GMC
- **Model:** SIERRA 1500
- **Year:** 2020
- **Manufacturer:** General Motors, LLC
- **Component:** ENGINE
## Narrative
Piston 5 dropped compression to 120 the rest were 190-200. The engine failed therefore none of my parking assist sensors were working and I backed into a car because the truck was misfiring.
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*Source: [NHTSA ODI](https://www-odi.nhtsa.dot.gov/downloads/) · MORVS · CC0 1.0*