P0698 OBD-II Trouble Code: Sensor Reference Voltage “C” Circuit Low

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0698 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0698 code

P0698 is a diagnostic trouble code (DTC) for "Sensor Reference Voltage “C” Circuit Low". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P0698 DIAGNOSTIC Get a fair and transparent estimate upfront

Check Engine Light

P0698 code definition

A P0698 trouble indicates that a problem has been detected by the Powertrain Control Module (PCM) or another control module in the sensor reference voltage "C" circuit.

What the P0698 code means

In the case of a P0968 code, a control module has detected an issue in the "C" circuit of the sensor reference voltage system. A module (most often the PCM) will have detected an irregular voltage level or connectivity problem relating to the electrical circuitry. The sensor reference voltage "C" circuit refers to a specific area of the sensor reference voltage circuit system. Some vehicle models may require multiple consecutive drive cycles with the reported issue in order to log the problem.

What causes the P0698 code?

  • Most instances of this trouble code are the cause of issues in the circuit-related wiring.

  • Corroded, broken, disconnected or faulty connectors and wiring can limit or disable the system.

  • In rare instances, a P0698 trouble code may be wrongfully reported as a result of a faulty control module. In this case, one or more modules may require reprogramming or replacement.

What are the symptoms of the P0698 code?

Depending on the severity of the circuit's electrical flow issue, the symptoms of a P0698 code can range from decreased fuel efficiency and underpowered engine performance to an outright failure of the engine to start. This code indicates that a voltage deficiency has been reported, but does not denote whether the deficiency itself is mild, severe or total. The ensuing symptoms will depend on the severity.

For the purpose of diagnosis, a trouble code and illuminated dashboard trouble light will come up to alert the operator to the problem.

How does a mechanic diagnose the P0698 code?

A P0698 code may be initially diagnosed by reading the trouble code via an OBD-II code reader. Because this code is often the result of an electrical connectivity failure, the wiring and electrical connectors should be thoroughly inspected for signs of fault, damage, corrosion and disconnection.

Each of the control modules that may have reported the concern should be tested according to the manufacturer's recommended method in order to verify them for signs of fault.

A specialized scanner (such as an Autohex) may be used to pinpoint control module concerns more easily. Due to the potentially high number of modules relating to the "C" circuit, specialized equipment can shave a lot of time from the diagnostic process.

Common mistakes when diagnosing the P0698 code

If the P0698 trouble code has been reported alongside other codes, it is possible that this code is indirectly the result of codes elsewhere in the system. As a general rule, trouble codes should be approached and fixed in the order in which they're reported.

How serious is the P0698 code?

Because a P0698 code does not specifically indicate how bad the voltage deficiency is, the seriousness will vary from case to case. However, due to the fact that the sensor reference voltage "C" circuit is necessary for the engine to function properly, it should be seen as an urgent and severe concern. Repairs are highly recommended as soon as they're made possible.

What repairs can fix the P0698 code?

  • Electrical connectors, wiring and any components related to the "C'" circuit should be replaced or repaired if they were cited as problems during the diagnostic stage.

  • The vehicle should be tested following any repairs. This will verify whether or not the trouble code has been solved properly.

Additional comments for consideration regarding the P0698 code

The "C" sector should be visually denoted somewhere along the circuit. Although the PCM is typically the control module that will report trouble codes of this nature, other modules may report a P0698 as well. These modules can include the body control module, anti-lock brake control module, fuel injection control module, turbo control module, anti-theft module, cruise control module, and climate control module.

Need help with a P0698 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

trouble codes
Check Engine Light
P0698

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0698 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

3,901

Rating Summary
3,566
166
43
25
101
3,566
166
43
25
101

Mack

19 years of experience
92 reviews
Mack
19 years of experience
Prompt, concise and professional.
2007 GMC SIERRA 1500 - CHECK ENGINE LIGHT IS ON - ARLINGTON, TEXAS

Jeremy

17 years of experience
180 reviews
Jeremy
17 years of experience
Did quick job with oil change, diagnostic of check engine light done poorly.
2013 AUDI Q7 - CHECK ENGINE LIGHT IS ON INSPECTION - BOYNTON BEACH, FLORIDA

Richard

10 years of experience
419 reviews
Richard
10 years of experience
This is the second time I’ve had Richard work on my car. He always does an outstanding job and is quick, knowledgeable and professional. Highly recommended!!
2012 DODGE CHALLENGER - CHECK ENGINE LIGHT IS ON - LAS VEGAS, NEVADA

Scott

31 years of experience
30 reviews
Scott
31 years of experience
Scott was very professional, honest, knowledgeable and skilled. Great experience. Highly recommended.
2004 CHEVROLET SILVERADO 2500 - CHECK ENGINE LIGHT IS ON - BALDWIN, MARYLAND

More related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Buy Fuel Treatments
Adding a fuel additive to your gas tank when you fill up is one way to clean vital engine parts of deposits, improve the performance of your engine,...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...

Related questions

Q: Trouble code P0455

You should have a mechanic use a smoke machine to test the system for leaks. The purge valve may be leaking causing it to not hold any vapor in the tank at idle. If this occurs it will cause the...

Q: My traction control is off and half of the engine doesn't work, I hooked up a computer to it and the P0800 code is on

Hello, thanks for writing in. P0800 is the trouble code for an issue with the vehicle's Transfer Case Control system. When the transfer case control module, a computer that is separate from the engine computer, detects an issue with the...

Q: P0443

Hi. There are evaporative hoses that run from the purge valve to the charcoal canister that could also have a leak in them causing the code p0443 to still be there. There also could be a problem with the charcoal...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com