P0699 OBD-II Trouble Code:Sensor Reference Voltage “C” Circuit High

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0699 code

P0699 is a diagnostic trouble code (DTC) for "Sensor Reference Voltage “C” Circuit High". 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. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 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$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0699 DIAGNOSTIC Get a fair and transparent estimate upfront

What the P0699 code means

A P0699 code denotes a fault in the sensor reference voltage “C” circuit. The controller area network (CAN) supplies its sensors with a 5-volt reference voltage.

The CAN bus is a series of sensors that can all communicate with each other and pass on information without the need for a host computer. With a P0699 code, the powertrain control module (PCM) or possibly another control module has detected this fault. Other control modules in the system may include:

  • Alternative fuel control module
  • Body control module
  • Anti-lock brake control module
  • Instrument panel control module
  • Fuel injection control module
  • Turbo control module
  • Anti-theft module
  • Cruise control module
  • Traction control module
  • Proximity alert module
  • Climate control module

The letter “C” narrows down diagnosis to a particular area of the circuit, but not necessarily to a specific component or wire.

What causes a P0699 code?

When a sensor reference “C” malfunction occurs, a trouble code is registered and the Malfunction Indicator Lamp (MIL) will be illuminated. Code set parameters may vary from one make/model to the next – many require several drive cycles in order for the MIL to illuminate, while others will illuminate the MIL after the initial failure.

What are the symptoms of a P0699 code?

How does a mechanic diagnose a P0699 code?

A suitable OBD-II scanner/code reader and digital volt/ohmmeter will be necessary for diagnosis and repair. A specialized scanner such as Autohex or Tech II may be needed to determine the general area of the malfunction. A technician will also need a memory device of some sort for backup, should the PCM and any other controllers lose their information and require reprogramming. A detailed factory wiring diagram and schematic of all the CAN processors will also be a must.

  • Start your diagnosis with a careful visual inspection of the connectors and wiring. Repair/replace any damaged, disconnected, shorted or corroded wiring or connectors. Retest the system.

  • If wiring, connectors and components (including fuses) appear to be in good working order, connect the scanner to the diagnostic port and record any stored codes. Freeze frame the data. This will be extremely useful in tracking down any intermittent conditions that may have been the cause of the code being stored.

  • Test drive the vehicle and see if codes return. If the code does not immediately return, it could be an intermittent problem. Intermittents can be quite tricky to diagnose and may need to be allowed to worsen and return before a correct diagnosis can be made.

  • Look for loose or disconnected engine or transmission ground cables, straps or wires, sometimes left disconnected after a repair job.

Common mistakes while diagnosing P0699 code

With a CAN-equipped vehicle, stored codes are a reaction to a communications failure between modules. This makes it easy to misinterpret the code and move toward replacing components that have nothing to do with the CAN itself.

How serious is a P0699 code?

A vehicle with a P0699 code can run poorly or not at all.

What repairs can fix a P0699 code?

Repair/replacement of wiring, connectors, components or sensors/processors in the CAN system.

Additional comments for consideration for P0699 code

This is a repair that is best left to a trained, qualified technician who knows the latest in CAN system technology. To disconnect and test every single pin in the CAN bus can take up to 40 hours of labor, and a single misplaced volt/ohmmeter probe can wipe out literally all the memory in the network, requiring a complete reprogramming. A specialized scanner such as Autohex can perform diagnostics by monitoring the system while the vehicle is being driven.

Need help with a P0699 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.

p0699
trouble codes
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0699 code.

SCHEDULE P0699 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

5,156

Rating Summary
4,752
196
50
27
131
4,752
196
50
27
131

Al

21 years of experience
14 reviews
Al
21 years of experience
Nissan Pathfinder - Check Engine Light is on - Atlanta, Georgia
Al, was cool and very knowledgeable. Being direct and upfront always works. Al, is a credit to the company.

Xavier

10 years of experience
20 reviews
Xavier
10 years of experience
Chevrolet Equinox - Check Engine Light is on - Frisco, Texas
Xavier was GREAT!!! He made sure that I understood everything that he did to my vehicle and answered all my questions. Very thorough and even worked thru the light rain that we had. When I have to use this service again, I hope to be able to request him!

Luis

14 years of experience
52 reviews
Luis
14 years of experience
Kia Sorento - Check Engine Light is on - Las Vegas, Nevada
Luis did an excellent job in determining that this was a warranty issue on bad parts. He has integrity and is good at what he does. I would highly recommend him for any auto repairs that come up.

Reginald

36 years of experience
32 reviews
Reginald
36 years of experience
BMW 325i - Check Engine Light is on - Los Angeles, California
Reginald was incredibly helpful in helping me to diagnose several issues in my car, as well as repair issues to help me pass a break and light test. He even went so far as to come to the brake and light testing location so that he could ensure that the car passed and be there if anything else needed to be fixed on the spot. Absolutely would recommend him to anyone who is looking for an honest and knowledgeable mechanic!


More related articles

P0413 OBD-II Trouble Code: Secondary Air Injection System Switching Valve A Circuit Open
P0413 means theres a issue with the vehicle’s air injection system due to faulty air injection pump, faulty wiring or faulty air bypass solenoid.
C1095 OBD-II Trouble Code: ABS Hydraulic Pump Motor Circuit Failure
Trouble code C1095 means the ABS hydraulic pump motor circuit has failed, often because of a damaged wheel speed sensor or wheel bearings.
P2066 OBD-II Trouble Code: Fuel Level Sensor “B” Performance
P2066 P2066 code definition Fuel Level Sensor “B” Performance What the P2066 code means P2066 is an OBD-II generic code for the engine control module (ECM) detecting the fuel level sensor “B” performance. The sensor output voltage is not accurate...

Related questions

White smoke coming from tailpipe

The white smoke is a sign that coolant or water is leaking into the cylinders. The radiator and overflow container are examined and checked for the right amount of fluids. The engine oil is checked next to make sure it...

P2118 where to look for the issue

Hello, thank you for writing in. You are throwing a code for the throttle body actuator control motor. More particularly, it means that the computer which monitors the throttle actuator has detected that the motor is working outside of it...

Car is stuttering while driving - 2005 Mitsubishi Eclipse

This may be a sign of a dirty or failing mass air flow sensor. The mass air flow sensor is a unit in the intake system that monitors air intake as it is mixed with fuel prior to being injected...

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 (855) 347-2779 · hi@yourmechanic.com