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 the car's computer is getting a low signal from one of the sensors it uses to check how the engine is working. It's like when a flashlight has low battery power and doesn't shine as brightly.
The P0698 code is triggered when the Engine Control Module (ECM) detects a low voltage in the reference voltage circuit 'C'. This circuit provides a stable voltage supply to various sensors.
The ECM monitors various sensor circuits to ensure they are receiving the correct reference voltage. If the voltage is lower than expected in the 'C' circuit, it can affect the sensor's ability to send accurate data to the ECM, resulting in the P0698 code.
• Check Engine Light is on
• Poor engine performance
• Engine misfires
• Faulty sensor
• Wiring issues (e.g., short or open circuit)
• Faulty ECM
ECM: Engine Control Module
OBD-II: On-Board Diagnostics II
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the sensor and reference voltage with a multimeter.
• Repair or replace damaged wiring or connectors.
• Replace the faulty sensor if needed.
• Replace or reprogram the ECM if necessary.
• OBD-II scanner
• Multimeter
• Wiring repair tools
$100 - $500
Moderate
• Chevrolet Silverado
• Ford F-150
• Toyota Camry
• Regularly inspect and maintain vehicle wiring.
• Ensure sensors are clean and functioning properly.
• Schedule routine vehicle diagnostics.
Sensor Issue
• Don't ignore the Check Engine Light.
• Get the vehicle diagnosed as soon as possible.
• Avoid driving long distances until the issue is resolved.
Check your vehicle's warranty for coverage on sensors and ECM issues.
This code often appears in vehicles with aging wiring or sensors.
Moderate – It should be addressed soon to prevent further engine issues.
Driving with a malfunctioning sensor can lead to increased emissions and potential engine damage.
• Engine at operating temperature
• Vehicle stationary
The affected sensor is typically located in the engine bay, connected to the ECM via wiring harnesses.
Q: Can I drive with a P0698 code?
A: It's not recommended to drive for long periods with this code, as it can lead to further engine issues.
Q: How do I clear a P0698 code?
A: After repairs, use an OBD-II scanner to clear the code from the ECM.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
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Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
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Fitment Required · Vehicle-fitment part
Commonly relevant for misfire, ignition-efficiency, and some drivability-related repairs.
Misfire and ignition-related faults commonly involve spark plugs as part of the repair path.
Check the correct plug type, gap, and engine application for your vehicle.
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Fitment Required · Vehicle-fitment part
Relevant when the fault points toward ignition-coil performance or cylinder-specific ignition issues.
Some ignition faults involve coil performance or cylinder-specific coil problems.
Match the coil to your engine and confirm the failed component before ordering.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.