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G
p0521
Easy Fix
GMC · Trucks
Oil Pressure Sensor Range
Quick Answer
Error code P0521 on your GMC Trucks means: Oil Pressure Sensor Range. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
T0800T0800AT6000ET1500T1500AT2500T3500T1500E
Likely Causes
  1. Faulty oil pressure sensor
  2. Low engine oil level
  3. Worn oil pump
  4. Dirty oil filter
  5. Faulty wiring to sensor
How to Fix It
1
Check engine oil level and top off if needed
2
Locate oil pressure sensor on engine
3
Test sensor resistance with multimeter
4
Verify sensor wiring and connector
5
Replace oil pressure sensor if faulty
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
Parts You May Need
Oil pressure sensor
Engine oil
Oil filter
Sensor connector
Related Error Codes
P0171P0174P0300P0420P0430
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