AutoCodes – Generic – P0698

P0698 Code - Sensor Reference Voltage 'C' Circuit Low

Quick Answer

The control module has internal 5-volt reference buses called "5-volt reference". Common causes include Faulty Engine Control Module (ECM), ECM harness is open or shorted, ECM circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0698 indicates Sensor Reference Voltage 'C' Circuit Low.
Common causes: Common causes include Faulty Engine Control Module (ECM), ECM harness is open or shorted, ECM circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 20,074

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 06, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0698 Description

The control module has internal 5-volt reference buses called "5-volt reference". Each reference bus provided 5-volt reference circuit for more than one sensor. Therefore, a fault condition on one 5-volt reference circuit will affect the other 5-volt reference circuits connected to the reference bus. The control module monitors the voltage on the 5-volt reference buses.

OBDII Code P0698 - Sensor Reference Voltage 'C' Circuit Low - AutoCodes.com — P0698 Code - Sensor Reference Voltage 'C' Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0698?

Faulty Engine Control Module (ECM)
ECM harness is open or shorted
ECM circuit poor electrical connection
Shorted sensor on 5 volt circuit

How to Fix the DTC P0698?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0698 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0698 code?

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Information for Specific Makes

P0698 Buick — 5V Reference 3 Circuit Low Voltage
P0698 Cadillac — 5V Reference 3 Circuit Low Voltage
P0698 Chevrolet — 5V Reference 3 Circuit Low Voltage
P0698 Chrysler — Accelerator Pedal Position Sensor Supply Voltage Too Low
P0698 Dodge — Accelerator Pedal Position Sensor Supply Voltage Too Low
P0698 GMC — 5V Reference 3 Circuit Low Voltage
P0698 Hyundai — Sensor Reference Voltage 'C' Circuit Low
P0698 Jeep — Accelerator Pedal Position Sensor Supply Voltage Too Low
P0698 KIA — Sensor Reference Voltage 'C' Circuit Low
P0698 Suzuki — 5 Volt Reference 3 Circuit Low Voltage
P0698 Volkswagen — Sensor Reference Voltage 'C' Circuit Low

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.