Exhaust Gas Recirculation Sensor B Circuit Low
The P2388 code means the vehicle's onboard diagnostic system has detected: Exhaust Gas Recirculation Sensor B Circuit Low. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $150 - $450 (parts and labor)
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What Are the Symptoms of P2388?
- Check Engine Light on
- Rough idle or engine hesitation
- Increased NOx emissions
- Engine pinging or knocking under load
- Reduced fuel economy
What Causes P2388? (Most Likely First)
- Short to ground in EGR sensor B circuit Very High
- Faulty EGR position sensor High
- Corroded sensor connector Moderate
- PCM input circuit failure Low
Can I Still Drive with P2388?
Short distances only. P2388 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What does P2388 mean?
P2388 indicates an EGR (Exhaust Gas Recirculation) system issue: Exhaust Gas Recirculation Sensor B Circuit Low. The EGR system reduces nitrogen oxide emissions by recirculating a portion of exhaust gas back into the intake.
Can I drive with P2388?
You can drive short distances. The engine may run rough or ping under load, and emissions will be higher than normal. Schedule a repair soon.
How much does it cost to fix P2388?
Most EGR repairs cost $150 to $450. Cleaning the valve may be sufficient ($100-$200), while a full replacement runs $200-$450.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P2388?
-
Scan for P2388 and review freeze frame conditions
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Inspect EGR valve for carbon buildup and free movement
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Test EGR sensor B signal voltage and compare to specifications
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Check EGR passage and tube for blockage or restriction
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
Which Vehicles Commonly Get P2388?
- 2015-2023 Ford F-150 5.0L V8
- 2013-2021 Hyundai Sonata 2.0L Turbo I4
- 2009-2017 BMW 328i 3.0L I6
- 2011-2017 Chevrolet Silverado 1500 5.3L V8
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