Skip the auto shop - Our mechanics make house calls

P0697 OBD-II Trouble Code: Sensor Reference Voltage “C” Circuit/Open

diagnostic check engine light

P0697 code definition

The P0697 code is a generic powertrain code related to computer output circuit issues, including an internal computer failure. In this case, the engine control module (ECM) or other supporting control module has detected a fault with the sensor reference voltage “C” circuit.

Codes related to the P0697 include:

What the P0697 code means

A code P0697 will be stored when a fault is detected in the sensor reference voltage “C” circuit. The ECM may not be the only control module, including the body control module or fuel injection control module, to detect this particular fault. The “C” denotes a specific area of the circuit.

The 5-volt reference signal is sent to or from various control modules through the controller area network (CAN), which helps various components communicate in the vehicle. Your vehicle may require several drive cycles with this particular failure before a code is stored.

What causes the P0697 code?

Several problems may cause a P0697 code including:

What are the symptoms of the P0697 code?

Symptoms of a P0697 code may include:

  • Check engine or warning light may illuminate
  • The vehicle may not start
  • The vehicle may start, but with some difficulty
  • The engine may idle roughly
  • The vehicle may lack power during acceleration
  • The engine may run roughly during normal driving conditions
  • The engine may misfire
  • Decreased fuel economy

How does a mechanic diagnose the P0697 code?

A mechanic may use several methods to diagnose a P0697 trouble code, including:

  • Utilize an OBD-II scanner to check for a stored P0697 trouble code
  • Use a complete wiring schematic specific to your vehicle’s specific make and model
  • Visually inspect all related wiring and electrical components for damage
  • Use a specialized scanner, such as a Tech II, to help locate the general area of the fault
  • Use a memory saving device to ensure other controllers do not lose memory during reprogramming
  • Use a diagnostic CAN scanner to see pin values and which control modules are activating
  • Check for disconnected or defective or system grounds
  • Check for any corroded or loose electrical connectors that may be increasing circuit resistance

Common mistakes when diagnosing the P0697 code

It is always recommended to diagnose and repair codes in the order in which they are stored, as subsequent codes may simply be a symptom of a larger problem.

How serious is the P0697 code?

Because a vehicle’s safe driving operation most likely will be impacted due to faults that store a P0697 code, this code is considered a potentially serious code. When this code appears, it is recommended to immediately take your vehicle to your local service center or mechanic for repair and diagnosis.

What repairs can fix the P0697 code?

Several repairs can fix a P0697 trouble code, including:

Additional comments related to a P0697 code

Due to the complexity of trouble codes related to the controller area network (CAN), it is recommended to seek professional assistance in diagnosing and repairing your vehicle when this code is stored.

Additionally, remember that modules other than the ECM may also report a P0697. Be sure to visually locate the “C” sector along the circuit and thoroughly diagnose any possible causes for the fault prior to repair.

Need help with a P0697 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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

Insurance Requirements for Car Registration in Kentucky
The Kentucky Transportation Cabinet requires that all drivers in Kentucky carry liability automotive insurance, or “financial responsibility” in order to operate a vehicle legally and maintain vehicle...
Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance Related Trouble Codes: P2158: Vehicle Speed Sensor B P2160: Vehicle Speed Sensor B Circuit Low P2161:...


Related questions

Q: Code p0421

Are there other codes set? This code, by itself, P0421 indicates that the engine management system detected the catalytic converter is performing below expected standards. This means the engine is sending contaminants (unburned fuel, oil fumes, etc.) down the exhaust,...

Q: What Is the OBD II System on My Car?

OBD II is an abbreviation of on board diagnostic system generation two. The system was brought into service in the vehicles of model year 1996. The system was put into all vehicles to monitor the operation and control the engine...

Q: Prnds flashing lights anb p0777 code

Hello. For this vehicle, it appears that the solenoids are located inside the transmission. For many vehicles the transmission control solenoids are bolted to the exterior of the transmission, however for this vehicle the solenoids are part of the transmission...