P0100 on Your 2021 Chevrolet Tahoe
A P0100 code on your 2021 Chevrolet Tahoe indicates the ECM has detected a malfunction in the mass air flow (MAF) sensor circuit. Your 5th-generation Tahoe uses the 5.3L V8, 6.2L V8, or 3.0L Duramax diesel, all relying on accurate MAF readings for fuel delivery.
Symptoms
- Check engine light on
- Rough or unstable idle
- Hesitation during acceleration
- Reduced power—noticeable when towing or loaded
- Poor fuel economy
- Possible stalling
Common Causes
- Contaminated MAF sensor (35%) — Four-plus years of dust, oil, and debris.
- Wiring or connector issues (22%) — Heat and vibration.
- Faulty MAF sensor (18%) — Internal failure.
- Intake air leak (13%) — Loose boot or clamp.
- Air filter restriction (8%) — Overdue change.
- ECM issue (4%) — Rare.
Diagnostic Steps
- MAF sensor cleaning — Remove and clean with MAF cleaner spray.
- Connector inspection — Check for corrosion.
- Air filter replacement — Fresh filter.
- Intake inspection — Check all post-MAF connections.
- Scan tool data — Verify MAF readings with GDS2 or compatible scanner.
- MAF replacement — If cleaning doesn't resolve it.
Repair Costs
- MAF cleaning: $10–$15 (DIY)
- Air filter: $18–$35 (DIY)
- MAF sensor: $150–$365
- Intake boot: $80–$210
- Wiring repair: $95–$280
Warranty
Your 2021 Tahoe's basic warranty has expired. The federal emissions warranty covers the MAF sensor for 8 years/80,000 miles through 2029.