Turbo Boost Pressure Sensor Circuit Bank 1 High (Generic)
The P4046 code means the vehicle's onboard diagnostic system has detected: Turbo Boost Pressure Sensor Circuit Bank 1 High (Generic). This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $80 - $350 (parts and labor)
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Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.
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Common Symptoms
- Check Engine Light on
- PCM limiting boost pressure
- Reduced engine power
- Turbo protection mode active
- Poor acceleration
Probable Causes (Ranked by Likelihood)
- Short to voltage in boost sensor circuit Very High
- Sensor failure reading high High
- Wiring chafed against power wire Moderate
- Reference voltage circuit fault Low
Step-by-Step Diagnostic Procedure
-
Check sensor voltage with key on engine off
-
Disconnect sensor and test for stray voltage
-
Inspect wiring for damage or chafing
-
Verify 5V reference and ground circuits
Frequently Asked Questions
Will P4046 put my truck in limp mode?
Possibly. If the PCM sees a persistently high boost reading, it may open the wastegate fully and limit engine power.
Can I drive with P4046?
You can drive short distances at reduced power.
How do I test the boost sensor?
With key on and engine off, the sensor should read atmospheric pressure, about 14.7 psi. If it reads significantly higher, the sensor or circuit is faulty.
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