OBD Guide
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P0698

Sensor Reference Voltage C Circuit Low

P0698 is an OBD-II diagnostic trouble code meaning: Sensor Reference Voltage C Circuit Low. Common causes: partial short circuit to ground in one of the sensors of group c, damage to voltage reference circuit wiring c. Estimated repair cost: $11–889.

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

Symptoms

  • Check Engine Light
  • Multiple sensor error codes
  • Unstable engine operation
  • Low readings from group C sensors
  • Switching to emergency engine operation mode

Causes

  • Partial short circuit to ground in one of the sensors of group C
  • Damage to voltage reference circuit wiring C
  • Sensor malfunction with internal ground leakage
  • Oxidation or damage to connectors
  • Internal ECU malfunction (weak reference voltage)

How to Fix

  1. Read all OBD-II codes and record the complete list
  2. Identify all sensors connected to circuit C according to the electrical diagram
  3. Measure the voltage on reference line C (normal: 5V)
  4. Turn off group C sensors one by one and monitor voltage restoration
  5. Find and replace a faulty sensor or repair damaged wiring
  6. If all sensors are working properly, diagnostics and replacement of the ECU

Related codes

P0697P0699P0641P0651

Error P0698 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0698 code mean?

P0698 is an OBD-II diagnostic trouble code that indicates: Sensor Reference Voltage C Circuit Low

What causes a P0698 error code?

The most common causes of P0698 include: Partial short circuit to ground in one of the sensors of group C; Damage to voltage reference circuit wiring C; Sensor malfunction with internal ground leakage; Oxidation or damage to connectors.

How do I fix a P0698 diagnostic trouble code?

To fix P0698: Read all OBD-II codes and record the complete list. Identify all sensors connected to circuit C according to the electrical diagram. Measure the voltage on reference line C (normal: 5V). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0698?

Do not drive — repair immediately

How much does it cost to fix P0698?

The estimated repair cost for P0698 is $11–889. Actual cost depends on your vehicle, location, and labor rates.

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