What Does P2570 Mean?
The PCM has detected an abnormally high voltage signal from the direct ozone reduction catalyst temperature sensor. This specialized catalyst is used in some vehicles to reduce ozone and NOx emissions.
Common Causes
35%
Open circuit in sensor ground wire
30%
Failed ozone catalyst temperature sensor with internal open
20%
Short to voltage in sensor signal wire
10%
Corroded or damaged sensor connector terminals
5%
PCM internal circuit failure
Diagnostic Steps
1
Step 1: Locate ozone catalyst temperature sensor (typically in or near catalytic converter)
2
Step 2: Measure sensor resistance with engine cold and compare to specifications
3
Step 3: Check sensor ground circuit continuity to PCM or chassis ground
4
Step 4: Inspect sensor wiring for damage from heat or physical contact with exhaust components
5
Step 5: Monitor sensor voltage in live data and compare to expected values at various temperatures
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
The PCM has detected an abnormally high voltage signal from the direct ozone reduction catalyst temperature sensor. This specialized catalyst is used in some vehicles to reduce ozone and NOx emissions.
The most common cause of P2570 (Direct Ozone Reduction Catalyst Temperature Sensor Circuit High) is: Open circuit in sensor ground wire
Typical repair costs for P2570 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive. Emissions may increase and check engine light will remain on. Some markets may fail emissions testing.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2570 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
