OBD Guide
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P06A3

Sensor Reference Voltage D Circuit/Open

P06A3 is an OBD-II diagnostic trouble code meaning: Sensor Reference Voltage D Circuit/Open. Common causes: short circuit to ground in the 5v reference voltage circuit of group d, break in the reference voltage line. Estimated repair cost: $6–333.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$6–333 (est.)

Symptoms

  • Check Engine Light Is On
  • Multiple simultaneous sensor error codes
  • Unstable engine operation or transition to emergency mode
  • Incorrect instrument readings (pressure, temperature)
  • Difficulty starting or stopping the engine

Causes

  • Short circuit to ground in the 5V reference voltage circuit of group D
  • Break in the reference voltage line
  • Malfunction of one of the sensors pulling the 5V line to ground
  • Damage to the wiring harness (chafing, melting)
  • Internal fault of the reference voltage regulator in the ECU

How to Fix

  1. Read all error codes and identify which sensors are connected to line D
  2. Disconnect the sensors one by one, measuring the voltage on the 5V line - find a sensor that eliminates the short circuit
  3. Check the resistance of the 5V line relative to ground (the norm is more than 100 kOhm)
  4. Inspect the wiring harness for damage and chafing.
  5. Replace the faulty sensor or restore the wiring
  6. Reset error codes, make sure sensor codes disappear

Related codes

P06A4P06A5P06A9P0641P0651

Error P06A3 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P06A3 code mean?

P06A3 is an OBD-II diagnostic trouble code that indicates: Sensor Reference Voltage D Circuit/Open

What causes a P06A3 error code?

The most common causes of P06A3 include: Short circuit to ground in the 5V reference voltage circuit of group D; Break in the reference voltage line; Malfunction of one of the sensors pulling the 5V line to ground; Damage to the wiring harness (chafing, melting).

How do I fix a P06A3 diagnostic trouble code?

To fix P06A3: Read all error codes and identify which sensors are connected to line D. Disconnect the sensors one by one, measuring the voltage on the 5V line - find a sensor that eliminates the short circuit. Check the resistance of the 5V line relative to ground (the norm is more than 100 kOhm). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P06A3?

Do not drive — repair immediately

How much does it cost to fix P06A3?

The estimated repair cost for P06A3 is $6–333. Actual cost depends on your vehicle, location, and labor rates.

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