What Does P1483 Mean?
The catalyst temperature sensor circuit voltage is reading above the expected range. This indicates a short to voltage, open circuit, or a faulty sensor internally shorted high.
Common Causes
35%
Open circuit in sensor ground or signal wire
30%
Failed catalyst temperature sensor with internal open
20%
Short to voltage in signal wire
10%
Corroded sensor connector causing high resistance
5%
PCM internal fault on sensor circuit
Diagnostic Steps
1
Step 1: Inspect sensor connector and wiring for corrosion, damage, or loose connections
2
Step 2: Disconnect sensor and measure resistance across sensor terminals; verify within specification
3
Step 3: With sensor disconnected, check signal wire voltage at PCM connector; should read near 0V
4
Step 4: Check for short to power by testing signal wire voltage with key on, sensor disconnected
5
Step 5: Verify ground circuit continuity from sensor to PCM or chassis ground
Estimated Repair Cost
$150 - $450
Parts + labor, varies by vehicle and location
The catalyst temperature sensor circuit voltage is reading above the expected range. This indicates a short to voltage, open circuit, or a faulty sensor internally shorted high.
The most common cause of P1483 (Catalyst Temperature Sensor Circuit Shorted High) is: Open circuit in sensor ground or signal wire
Typical repair costs for P1483 range from $150 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive short-term but catalyst protection strategy is disabled. Potential for catalyst damage if severe overheating conditions occur.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1483 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Manufacturer
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