Turbo Boost Pressure Not Detected (Ford)
What does P1248 mean?
The P1248 code means the vehicle's onboard diagnostic system has detected: Turbo Boost Pressure Not Detected (Ford). This is a critical severity code.
Common Symptoms
- Check Engine Light on
- Complete loss of turbo boost
- Severe power loss
- Engine running in limp mode
- Turbo does not spool at all
Probable Causes (Ranked by Likelihood)
- Turbocharger catastrophic failure Very High
- Major boost leak or disconnected piping High
- Wastegate stuck fully open Moderate
- Boost pressure sensor circuit failure Moderate
- Seized turbo due to oil starvation Low
Step-by-Step Diagnostic Procedure
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Inspect turbocharger for shaft play or seized impeller
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Check for disconnected or damaged boost piping
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Verify boost pressure sensor readings and wiring continuity
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Inspect turbo oil supply and drain lines for blockage
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Listen for abnormal turbo noise or lack of spool sound
Frequently Asked Questions
What does boost pressure not detected mean?
P1248 means the PCM sees no boost at all when the turbo should be producing boost. This indicates complete turbo failure, a massive boost leak, or a sensor failure.
Can a bad boost sensor cause P1248?
Yes, but it is less common than actual turbo problems. A failed sensor can make the PCM think there is no boost even when the turbo works.
How much does EcoBoost turbo replacement cost?
A turbocharger replacement on Ford EcoBoost typically costs $1500-$3000 including parts and labor.