What Does P1402 Mean?
The power switch controlling the heated catalyst on bank 1 has exceeded its maximum operating temperature. This overheating condition can be caused by excessive current draw, poor cooling, or switch component failure.
Common Causes
40%
Shorted heated catalyst element drawing excessive current
30%
Failed catalyst heater relay or control switch with internal resistance
15%
Excessive resistance in catalyst heater circuit causing switch overload
10%
Cooling system failure or inadequate ventilation around control module
5%
Multiple on/off cycles without adequate cool-down time
Diagnostic Steps
1
Step 1: Allow system to cool completely, then measure catalyst heater element resistance for shorts
2
Step 2: Check current draw during heater operation (compare to specifications, typically 10-30A)
3
Step 3: Inspect heater relay/power switch for signs of overheating, melting, or discoloration
4
Step 4: Check all connections in heater circuit for high resistance or poor contact
5
Step 5: Monitor switch temperature with infrared thermometer during operation cycle
Estimated Repair Cost
$250 - $2,800
Parts + labor, varies by vehicle and location
The power switch controlling the heated catalyst on bank 1 has exceeded its maximum operating temperature. This overheating condition can be caused by excessive current draw, poor cooling, or switch component failure.
The most common cause of P1402 (Heated Catalyst Power Switch Overtemperature Condition (Bank 1)) is: Shorted heated catalyst element drawing excessive current
Typical repair costs for P1402 range from $250 to $2,800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Potential fire hazard if overheating continues. Do not operate vehicle until diagnosed and repaired to prevent damage to surrounding components.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1402 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Manufacturer
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