Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that a part of the car that gives power to some sensors isn't getting enough electricity. It's like trying to use a flashlight with weak batteries.
The Engine Control Module (ECM) has detected that the voltage in the sensor power supply circuit 'B' is below the expected range.
The P16F6 code indicates that the ECM has identified an issue with the voltage level in the sensor power supply 'B' circuit. This could be due to a fault in the wiring, connectors, or a malfunctioning sensor that is drawing too much current, causing the voltage to drop below the threshold.
• Check Engine Light is on
• Poor engine performance
• Erratic sensor readings
• Faulty sensor drawing excessive current
• Damaged or corroded wiring or connectors
• Faulty ECM or power supply module
ECM: Engine Control Module
OBD-II: On-Board Diagnostics, Second Generation
• Use a multimeter to check the voltage at the sensor power supply 'B' circuit.
• Inspect the wiring and connectors for damage or corrosion.
• Test the sensors connected to the circuit for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace faulty sensors.
• Replace or reprogram the ECM if necessary.
• Multimeter
• OBD-II scanner
• Wire repair kit
$100 - $500
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regularly inspect and maintain wiring harnesses.
• Ensure all connectors are securely fastened.
• Perform routine checks on sensor functionality.
Sensor Issue
• Have the vehicle inspected by a professional mechanic.
• Avoid driving the vehicle if performance is severely affected.
Repairs may be covered under the vehicle's powertrain warranty if applicable.
This code has been reported in vehicles with complex sensor networks, particularly in models with advanced electronics.
Moderate – It is advisable to address this issue soon to avoid potential drivability problems.
Driving with this code may cause the vehicle to perform poorly, which could be unsafe. It is recommended to have the issue diagnosed and repaired promptly.
• Engine running
• Sensors connected and operational
The sensor power supply 'B' circuit is typically located within the vehicle's main wiring harness, near the ECM or fuse box.
Q: Can I drive my car with a P16F6 code?
A: It's possible to drive, but not recommended as it may affect engine performance and safety.
Q: How do I reset the P16F6 code?
A: After repairing the issue, use an OBD-II scanner to clear the code from the ECM.
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