Leaking or disconnected charge air cooler pipes, intercooler, or intake hoses; Faulty or contaminated manifold absolute pressure sensor or boost pressure sensor; Sticking or failed turbocharger wastegate actuator or boost control solenoid; Restricted exhaust system, such as a clogged diesel particulate filter or catalytic converter; Damaged turbocharger compressor wheel or excessive shaft play; Wiring issues or poor connections at the MAP sensor or boost control solenoid; Engine vacuum leaks or unmetered air entering the intake system

DTC codes / Ford codes / P1302

P1302 · FordBoost Calibration Low

Q: What does code P1302 mean?

Boost Calibration Low. P1302 on Ford vehicles indicates that the powertrain control module has detected a boost calibration signal that is lower than expected for the current operating conditions. The computer compares the actual boost pressure from the manifold absolute pressure sensor against the desired boost pressure calculated from engine speed, throttle position, and other inputs, and sets this code when the actual value falls below the calibrated threshold for a specified time.

P1302 on Ford vehicles indicates that the powertrain control module has detected a boost calibration signal that is lower than expected for the current operating conditions. The computer compares the actual boost pressure from the manifold absolute pressure sensor against the desired boost pressure calculated from engine speed, throttle position, and other inputs, and sets this code when the actual value falls below the calibrated threshold for a specified time.

SystemPowertrain

Code typeFord specific

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Reduced engine power or a limp mode condition, especially during acceleration
Poor acceleration and sluggish throttle response
Audible hissing or whistling from the engine bay under boost
Decreased fuel economy due to the engine running rich or retarding timing
In rare cases, the engine may stumble or hesitate under load

Common causes, most likely first

Leaking or disconnected charge air cooler pipes, intercooler, or intake hoses
Faulty or contaminated manifold absolute pressure sensor or boost pressure sensor
Sticking or failed turbocharger wastegate actuator or boost control solenoid
Restricted exhaust system, such as a clogged diesel particulate filter or catalytic converter
Damaged turbocharger compressor wheel or excessive shaft play
Wiring issues or poor connections at the MAP sensor or boost control solenoid
Engine vacuum leaks or unmetered air entering the intake system

How to diagnose and fix it

Perform a visual inspection of all intake and charge air cooler hoses for cracks, loose clamps, or disconnections
Use a scan tool to check live data for desired and actual boost pressure, and compare readings during a test drive
Test the MAP sensor and boost control solenoid for proper resistance and operation according to Ford service information
Check for exhaust restrictions by measuring backpressure or inspecting the DPF and catalytic converter
Inspect the turbocharger wastegate actuator for free movement and correct adjustment
Perform a smoke test on the intake system to locate vacuum or boost leaks
Repair or replace any faulty components and clear the code, then verify the repair with a road test

Common Misdiagnosis Traps for P1302

A loose or cracked charge air cooler pipe is the most frequent cause of this code on Ford EcoBoost engines, yet many technicians replace the turbocharger first without checking the pipes.
The code can be set by a dirty or failing MAP sensor that reports lower than actual pressure, so always compare sensor readings with a known good gauge before condemning the turbo.
On Ford Power Stroke diesel engines, a restricted diesel particulate filter can cause low boost by increasing exhaust backpressure, mimicking a turbo failure.
Intermittent wiring faults at the boost control solenoid connector can set P1302 without any mechanical issue, so wiggle-test the harness while monitoring live data.
After any repair, the adaptive learning values for the turbocharger may need to be reset with a scan tool to prevent the code from returning prematurely.

Can I keep driving with P1302?

You can usually drive the vehicle with this code, but avoid heavy acceleration and towing until the fault is repaired. Prolonged driving with low boost can lead to poor fuel economy and may damage the turbocharger or exhaust system over time.

Tools that help

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Guidance is general and written for Ford vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.