P1466 – OBD-II DTC

OBD-II DTC P1466 – A/C pressure sensor circuit voltage low

DTC P1466 meaning

DTC P1466 refers to a diagnostic trouble code indicating a low voltage condition in the A/C pressure sensor circuit. This sensor is responsible for monitoring the refrigerant pressure in the air conditioning system. When the voltage reading from this sensor falls below the expected range, the engine control module (ECM) triggers this code to alert the technician of a potential issue.

DTC P1466 symptoms

Common symptoms associated with DTC P1466 may include:

• Inoperative air conditioning system
• Increased engine temperature
• Unusual noises from the A/C compressor
• Dashboard warning lights illuminated

DTC P1466 causes

Several factors can lead to the triggering of DTC P1466, including:

• Faulty A/C pressure sensor
• Wiring issues such as shorts or open circuits
• Corroded or loose electrical connections
• Low refrigerant levels in the A/C system
• Faulty engine control module (ECM)

DTC P1466 seriousness

DTC P1466 can be considered serious as it may indicate a malfunctioning air conditioning system. If left unaddressed, it can lead to further damage to the A/C components or the engine. Additionally, it may affect the vehicle’s overall comfort and drivability, especially in extreme weather conditions.

How to diagnose DTC P1466

To diagnose DTC P1466, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the code.
2. Inspect the A/C pressure sensor and its wiring for visible damage.
3. Check the electrical connections for corrosion or looseness.
4. Measure the voltage at the A/C pressure sensor with a multimeter.
5. Compare the readings to the manufacturer’s specifications.
6. If necessary, check the refrigerant levels in the A/C system.
7. Perform a continuity test on the wiring to ensure there are no breaks.

How to fix DTC P1466 step-by-step instructions

To fix DTC P1466, follow these steps:

1. Repair or replace any damaged wiring or connectors found during diagnosis.
2. If the A/C pressure sensor is faulty, replace it with a new one.
3. Ensure that the refrigerant levels are within the specified range.
4. Clear the DTC using an OBD-II scanner.
5. Test the A/C system to ensure proper operation.
6. Re-scan the system to confirm that the code does not return.

How to erase DTC P1466

To erase DTC P1466, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the “Erase Codes” or “Clear DTCs” option on the scanner.
4. Confirm the action to clear the trouble codes.
5. Disconnect the scanner and start the engine to verify that the code does not return.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.