What Does P1482 Mean?
The catalyst temperature sensor circuit voltage is reading below the expected range. This indicates a short to ground in the wiring, a faulty sensor, or a problem with the PCM ground circuit.
Common Causes
35%
Damaged or chafed wiring causing short to ground
30%
Failed catalyst temperature sensor with internal short
20%
Corroded or damaged connector at sensor
10%
PCM internal fault on sensor circuit
5%
Poor ground connection in sensor circuit
Diagnostic Steps
1
Step 1: Visually inspect catalyst temperature sensor wiring and connector for damage, chafing, or corrosion
2
Step 2: Disconnect sensor and measure resistance across sensor terminals; compare to specification
3
Step 3: Check voltage at sensor connector with ignition on; should read reference voltage (typically 5V)
4
Step 4: Check for short to ground by measuring resistance from signal wire to ground with sensor disconnected
5
Step 5: If all wiring tests pass, substitute known-good sensor or test PCM circuits
Estimated Repair Cost
$150 - $450
Parts + labor, varies by vehicle and location
The catalyst temperature sensor circuit voltage is reading below the expected range. This indicates a short to ground in the wiring, a faulty sensor, or a problem with the PCM ground circuit.
The most common cause of P1482 (Catalyst Temperature Sensor Circuit Shorted Low) is: Damaged or chafed wiring causing short to ground
Typical repair costs for P1482 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 may be compromised. Extended operation could lead to catalyst damage from overheating.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1482 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Manufacturer
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