AutoCodes – Generic – P1548

P1548 Code - A/C Recirculation Circuit

Quick Answer

The Powertrain Control Module (PCM) monitors the Manifold Absolute Pressure (MAP) at various engine speeds during Wide Open Throttle (WOT) operation and compares the information to a calibrated value. Common causes include Intake Air restriction, Clogged Air Filter. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: P1548 indicates A/C Recirculation Circuit.
Common causes: Common causes include Intake Air restriction, Clogged Air Filter.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 8,247

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 29, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1548 Description

OBDII Code P1548 - A/C Recirculation Circuit - AutoCodes.com — P1548 Code - A/C Recirculation Circuit

What does this mean?

What are the Possible Causes of the DTC P1548?

Intake Air restriction
Clogged Air Filter

How to Fix the DTC P1548?

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 P1548 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.

Need more information about the P1548 code?

Need more information on how to fix the P1548 code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Makes

P1548 Audi — Wastegate Bypass Regulator Valve Open
P1548 Buick — A/C Recirculation Circuit
P1548 Cadillac — A/C Recirculation Circuit
P1548 Chevrolet — A/C Recirculation Circuit
P1548 Ford — Engine Air Filter Restriction
P1548 GMC — A/C Recirculation Circuit
P1548 Isuzu — A/C Compressor Clutch Output Circuit Malfunction
P1548 Lincoln — Engine Air Filter Restriction
P1548 Mercury — Engine Air Filter Restriction
P1548 Volkswagen — Wastegate Bypass Regulator Valve Open

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.