AutoCodes – Generic – P1248

P1248 Code - Turbo Boost Pressure Not Detected

Quick Answer

The boost pressure sensor responds to pressure changes in the intake manifold. Common causes include Damaged MAP hose, Low turbo boost, Intake manifold or crossover tube hose leaks. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1248 indicates Turbo Boost Pressure Not Detected.
Common causes: Common causes include Damaged MAP hose, Low turbo boost, Intake manifold or crossover tube hose leaks.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 43,218

How popular is this code, among other codes? Medium

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 12, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1248 Description

The boost pressure sensor responds to pressure changes in the intake manifold. This pressure is created by the turbocharger and changes with Accelerator Pedal Position (APP) and engine speed. The Powertrain Control Module (PCM) uses this information to assist in diagnosis of the barometric pressure (BARO) sensor and to provide engine overboost protection. The boost pressure sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit. The PCM supplies 5 volts to the boost pressure sensor on the 5-volt reference 2 circuit, and provides a ground on a low reference circuit. The boost pressure sensor provides a signal to the PCM on a signal circuit relative to the pressure changes. The PCM monitors the boost pressure sensor signal for voltage outside of the normal range. The PCM calculates a predicted value for the boost pressure sensor. The PCM then compares the predicted value to the actual signal.

OBDII Code P1248 - Turbo Boost Pressure Not Detected - AutoCodes.com — P1248 Code - Turbo Boost Pressure Not Detected

What does this mean?

What are the Possible Causes of the DTC P1248?

Damaged MAP hose
Low turbo boost
Intake manifold or crossover tube hose leaks
Faulty MAP sensor
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P1248?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1248 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Information for Specific Makes

P1248 Acura — Accelerator Pedal Position Sensor 1 and 2 Incorrect correlation
P1248 Audi — Start Of Cold Start Injector Control Difference
P1248 Buick — Injector 1 Positive Voltage Control Circuit Shorted to Control Circuit
P1248 Cadillac — Injector 1 Positive Voltage Control Circuit Shorted to Control Circuit
P1248 Chevrolet — Injector 1 Positive Voltage Control Circuit Shorted to Control Circuit
P1248 Ford — Turbo Boost Pressure Not Detected
P1248 GMC — Injector 1 Positive Voltage Control Circuit Shorted to Control Circuit
P1248 Honda — Accelerator Pedal Position Sensor 1 and 2 Incorrect correlation
P1248 Isuzu — Fuel Pump Relay Control Circuit Open
P1248 Mitsubishi — AWD Plausibility
P1248 Volkswagen — Start Of Cold Start Injector Control Difference

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1248 Code

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Chris
Date: July 6, 2024 at 12:53 pm

Great explanation. Useless answer though, because someone forgot to mention which car that explanation belongs with (P1248 is different on all makes)

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