Turbocharger Boost Control 'A' Position Exceeded Learning Limit
The P2590 code means the vehicle's onboard diagnostic system has detected: Turbocharger Boost Control 'A' Position Exceeded Learning Limit. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $300 - $1000 (parts and labor)
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Common Symptoms
- Check Engine Light on
- Reduced turbo boost
- Engine performance degraded
- Limp mode under heavy acceleration
- Turbo may feel sluggish
Probable Causes (Ranked by Likelihood)
- Carbon buildup on turbo variable vanes Very High
- Wastegate actuator wear or linkage looseness High
- Boost pressure leak in charge air system Moderate
- PCM boost learning table corrupted Low
Step-by-Step Diagnostic Procedure
-
Read freeze frame data and confirm P2590 is present
-
Check turbo vane operation and inspect for carbon buildup
-
Perform boost leak test on charge air system
-
Reset PCM boost learning values and road test
Frequently Asked Questions
What does P2590 mean?
P2590 indicates an issue with the turbocharger boost control 'a' position exceeded learning limit. This affects the PCM's ability to properly control turbocharger boost levels.
Can I drive with a P2590 code?
You can drive short distances with reduced power. Have it repaired promptly to avoid further turbo system damage.
How much does it cost to fix P2590?
Repairs typically cost $300 - $1000, depending on the specific component that has failed.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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