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p2646
Easy Fix
Acura · Sedans
VTEC Oil Pressure Switch Low
Quick Answer
Error code P2646 on your Acura Sedans means: VTEC Oil Pressure Switch Low. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
DE3/DE4DC5/DN2DN2NC1KC1UA6CU2
Likely Causes
  1. Insufficient engine oil level
  2. Faulty oil pressure switch
  3. Clogged oil filter
  4. Defective oil pump
  5. Low oil viscosity or contaminated oil
How to Fix It
1
Check engine oil level immediately
2
Add oil if below minimum level
3
Replace oil filter if clogged
4
Inspect oil pressure switch connector
5
Replace oil pressure switch 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
Engine oil
Oil filter
Oil pressure switch
Related Error Codes
P0171P0300P0301P0420P0325
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