OBD Guide
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P0697

Sensor Reference Voltage C Circuit/Open

P0697 is an OBD-II diagnostic trouble code meaning: Sensor Reference Voltage C Circuit/Open. Common causes: short circuit to ground in the circuit of one of the sensors of group c, open 5v reference wire on circuit c. Estimated repair cost: $11–889.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$11–889 (est.)

Symptoms

  • The Check Engine light comes on
  • Multiple sensor error codes simultaneously
  • Unstable engine operation
  • Incorrect position sensor readings
  • Switching to emergency engine operation mode

Causes

  • Short circuit to ground in the circuit of one of the sensors of group C
  • Open 5V reference wire on circuit C
  • Sensor fault with internal short circuit
  • Damage to the wiring between the ECU and sensors
  • Internal ECU fault

How to Fix

  1. Read all OBD-II error codes and write down each one
  2. Determine which sensors are connected to the reference voltage circuit C according to the diagram
  3. Measure the reference voltage at each sensor in this circuit (standard: 5 V)
  4. Disconnect sensors one at a time and check for voltage recovery
  5. Find and eliminate short circuit to ground (replace damaged sensor or wiring)
  6. If the external circuits are in good condition - diagnostics and replacement of the ECU

Related codes

P0698P0699P0641P0651P0106P0121

Error P0697 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0697 code mean?

P0697 is an OBD-II diagnostic trouble code that indicates: Sensor Reference Voltage C Circuit/Open

What causes a P0697 error code?

The most common causes of P0697 include: Short circuit to ground in the circuit of one of the sensors of group C; Open 5V reference wire on circuit C; Sensor fault with internal short circuit; Damage to the wiring between the ECU and sensors.

How do I fix a P0697 diagnostic trouble code?

To fix P0697: Read all OBD-II error codes and write down each one. Determine which sensors are connected to the reference voltage circuit C according to the diagram. Measure the reference voltage at each sensor in this circuit (standard: 5 V). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0697?

Do not drive — repair immediately

How much does it cost to fix P0697?

The estimated repair cost for P0697 is $11–889. Actual cost depends on your vehicle, location, and labor rates.

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