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 there's a problem with the sensor that tells the car's computer where the oil pump is. It's like when you can't find your toy because the light is off.
The P1684 code indicates an issue with the circuit that monitors the position of the metering oil pump. This sensor helps the engine control module (ECM) know the exact position of the oil pump for proper oil distribution.
The metering oil pump position sensor is responsible for providing feedback to the ECM about the oil pump's position. If the sensor circuit is malfunctioning, the ECM cannot accurately control the oil flow, potentially leading to engine performance issues.
• Check Engine Light is on
• Poor engine performance
• Increased exhaust emissions
• Faulty metering oil pump position sensor
• Damaged wiring or connectors
• ECM failure
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.
• Test the metering oil pump position sensor for proper operation.
• Replace the metering oil pump position sensor.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Vehicle 1
• Vehicle 2
• Vehicle 3
• Regularly inspect and maintain wiring and connectors.
• Ensure timely maintenance of the oil pump and related components.
• Address any engine performance issues promptly.
Sensor Issue
• Have the vehicle inspected by a professional if the Check Engine Light is on.
• Avoid driving the vehicle excessively until the issue is resolved.
Check with your vehicle manufacturer for specific warranty coverage related to sensors and ECM components.
This code has been associated with sensor failures and wiring issues in vehicles with advanced oil metering systems.
Moderate – While the vehicle may still be drivable, it's important to address this issue to prevent potential engine damage.
Driving with a malfunctioning oil pump sensor may lead to increased emissions and potential engine damage, which could affect vehicle safety and compliance with emissions regulations.
• Engine running
• Vehicle at operating temperature
The metering oil pump position sensor is typically located near the oil pump, which is often found on the engine block.
Q: Can I drive my car with a P1684 code?
A: It's not recommended to drive for long periods with this code, as it may lead to engine damage.
Q: How can I prevent a P1684 code?
A: Regular maintenance and inspections of the oil pump and sensor can help prevent this issue.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
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.
View on Amazon
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.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.