P1433 Code: Meaning, Symptoms, Causes & Fix

Overview

Code P1433 indicates a fault in A/C Refrigerant Temperature Circuit Low, typically within powertrain controls.

Symptoms

reduced performance
increased fuel use
check engine light

Common causes

Broken terminal inside harness affecting a/c refrigerant temperature circuit low
Open circuit in wiring
Connector pin damage/corrosion or harness stress near related components

How to diagnose P1433

Confirm P1433 and capture freeze-frame data with a professional scan tool.
Inspect wiring, connectors, and grounds related to a/c refrigerant temperature circuit low for obvious defects.
Use a continuity test from module pin to component to identify opens/high resistance.
Check for related DTCs to identify the root-cause chain before replacing parts.
After repair, clear codes and confirm readiness monitors complete without recurrence.

Severity of code P1433

Moderate: This code is moderate severity: the vehicle may still operate, but fault progression can increase repair cost over time.

Can you drive with P1433?

Most vehicles can be driven short-term with P1433, but postpone heavy load/highway driving until repaired.

If the warning lamp is flashing or drivability/safety is affected, avoid driving and diagnose immediately.

How to fix it (step-by-step)

Repair obvious wiring/connector faults first to prevent repeat parts replacement.
Address the root fault mode (open) in the a/c refrigerant temperature circuit low circuit/system.
Apply the required relearn/adaptation procedure if specified by service information.
Road-test and verify P1433 remains cleared under the conditions that originally set the code.

Fix options

Repair open circuit and secure connector lock.
Restore continuity and verify pin tension.
Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$200-$900

Common mistakes when diagnosing P1433

Replacing parts without verifying voltage, ground, and signal integrity first.
Ignoring related stored/pending codes that indicate upstream faults.
Skipping post-repair verification drive cycle and readiness checks.

P1433 in common vehicles

P1433 appears across makes such as Ford, Toyota, Honda, Chevrolet. Failure patterns differ by platform: wiring routes, software calibration, and component supplier revisions can change root cause.

Frequently asked questions

What causes P1433?

P1433 is commonly set by open faults affecting a/c refrigerant temperature circuit low.

How much does it cost to fix P1433?

For P1433, repair costs are typically $200-$900 depending on exact root cause, labor rates, and part quality.

Can I clear P1433 without repair?

You can clear P1433 temporarily, but the code usually returns until the underlying fault is corrected.