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

3,696

Rating Summary
3,372
162
42
24
96
3,372
162
42
24
96

Jerome

31 years of experience
68 reviews
Jerome
31 years of experience
Arrived on time. Very detailed when explaining vehicle issues. Seemed to truly enjoy his job. If I needed an “expert car doctor “ it would be Dr. Jerome Joachim, PhD.
2005 HONDA ODYSSEY - CHECK ENGINE LIGHT IS ON - RIVERDALE, MARYLAND

Michael

24 years of experience
206 reviews
Michael
24 years of experience
The appointment was scheduled a few hours earlier due to cancellation of prior appointment . The device advisor told me that Micheal didn't perform diognostics for my check engine light which he did and was told he could just advise me on what to do. In order to get him to do that I scheduled a oil change. When Micheal arrived he first said that I would have to schedule a separate appointment for the diagnostic . The had trouble with internet speed and wanted to use my wifi which I agreed to but had problems with him wanting my password . After performing a 15 min diagnostic his advise was to replace the part that I had installed for over 100 dolllars myself then paying YM 70 dollars fora 15 min inspection. After conversing for a few minutes Micheal came accross as knolegable but reviews had no years on nearly all of the great referral .
2009 CHEVROLET TAHOE - CHECK ENGINE LIGHT IS ON - QUEEN CREEK, ARIZONA

Jerimiah

16 years of experience
216 reviews
Jerimiah
16 years of experience
Very friendly, knowlegable, and on time
2001 FORD F-350 SUPER DUTY - CHECK ENGINE LIGHT IS ON INSPECTION - HENDERSON, NEVADA

Joel

18 years of experience
562 reviews
Joel
18 years of experience
Joel did what two other Mechanics prior to him couldn't do on my car and that was to diagnose and pin point the problem. He wasn't that talkative but strictly business kind of like the terminator and that's ok with me.I've already referred Joel to a friend. Joel completed the mission just like the terminator. 3
2006 NISSAN SENTRA - CHECK ENGINE LIGHT IS ON - JACKSONVILLE, FLORIDA

More related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Find the Keyless Code on a Ford Explorer or Mercury Mountaineer
Many Ford Explorers and Mercury Mountaineers were manufactured with an option known as the Ford keyless entry keypad. Some models refer to it as SecuriCode as well. It...
P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222...

Related questions

Q: engine wont restart when hot, no spark P0340 has 12v on both connectors, freq from 5-11hz when cranking

Since the crank position sensor gets its timing signal off the damper, I would first replace the damper to be sure timing was correct. The fact that this failure occurs after a "heat soak" cycle, and the P0340 code is...

Q: Q: Check Engine light on

If the Check Engine light came on in relation to the fuel cap being replaced, then that means it may not be a fuel cap related problem. I would recommend having the vehicle scanned for trouble codes by a knowledgable...

Q: Venza 2010 L4-2.7L: My check engine light is permanently turned On. I have these codes P0012, P0016, P0017. What needs to be fixe

These are fault codes indicating problems related to the timing of your car's engine. Normally the car will not run very well or sometimes not at all when these are on. I would suggest having an expert from YourMechanic come...

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