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

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Cost of diagnosing the P0697 code

P0697 is a diagnostic trouble code (DTC) for "Sensor Reference Voltage “C” Circuit/Open". 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.

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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.

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Paul

22 years of experience
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22 years of experience
Paul was top notch. He arrived on time and listened to my thoughts on the issue. He ran some tests and began narrowing in on the problem. Turns out, the problems was a lot smaller then I had thought. He fixed the problem and created a new ticket and adjusted the charges accordingly. I am very satisfied with his professionalism.
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Noe

33 years of experience
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33 years of experience
Noe was great as usual but we still couldn't fix my car. I'm spending $$$ trying to find a very illusive fault!
2004 CHEVROLET TRAILBLAZER - CHECK ENGINE LIGHT IS ON - SEATTLE, WASHINGTON

Breck

17 years of experience
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Breck
17 years of experience
I was very please at Brecks recommendation for the repairs on my vehicle. I will for sure use him for all future repairs/consultations on my vehicle. He was upfront, honest and on time for my appointment. I will recommend him to all my family and friends. He is totally awesome! I had initially had another diagnosis on my car and it wasn't what they said it was. This will not be as costly as recommended by another mechanic! Thanks, Breck!
2010 CHEVROLET CAMARO - CHECK ENGINE LIGHT IS ON - KATY, TEXAS

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38 years of experience
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