What Does P2246 Mean?
The PCM detected abnormally high voltage in the reference voltage circuit for Bank 1 Sensor 1 oxygen sensor. This indicates the reference voltage exceeds the expected threshold for proper sensor operation.
Common Causes
35%
Shorted O2 sensor signal wire to voltage source or heater circuit
30%
Failed oxygen sensor with internal short circuit
20%
Damaged wiring causing cross-circuit contamination from other systems
10%
PCM internal fault providing excessive reference voltage
5%
Water or contamination in connector causing voltage feedback
Diagnostic Steps
1
Step 1: Disconnect Bank 1 Sensor 1 and measure reference voltage at PCM side of connector (should drop to normal range if sensor is shorted)
2
Step 2: Inspect wiring harness for damage, chafing, or contact with hot engine components
3
Step 3: Check for voltage on signal wire with sensor disconnected and ignition on (should show only reference voltage)
4
Step 4: Measure resistance between signal wire and other circuits to check for cross-circuit shorts
5
Step 5: If wiring tests normal, replace O2 sensor; if problem persists, suspect PCM fault
Estimated Repair Cost
$150 - $550
Parts + labor, varies by vehicle and location
The PCM detected abnormally high voltage in the reference voltage circuit for Bank 1 Sensor 1 oxygen sensor. This indicates the reference voltage exceeds the expected threshold for proper sensor operation.
The most common cause of P2246 (O2 Sensor Reference Voltage Circuit High Bank 1 Sensor 1) is: Shorted O2 sensor signal wire to voltage source or heater circuit
Typical repair costs for P2246 range from $150 to $550, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but fuel mixture control is compromised, likely causing rich running condition, poor fuel economy, and increased emissions. May damage catalytic converter over time.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2246 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System / Emissions Control
Difficulty
Type
Generic (SAE)
Recommended Tools
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