OBD Guide
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P06A5

Sensor Reference Voltage D Circuit High

P06A5 is an OBD-II diagnostic trouble code meaning: Sensor Reference Voltage D Circuit High. Common causes: malfunction of the internal reference voltage regulator in the ecu, shorting the reference voltage line to a wire with a higher potential. Estimated repair cost: $22–444.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$22–444 (est.)

Symptoms

  • Check Engine Light Is On
  • Inflated sensor readings (pressure, temperature)
  • Many related sensor error codes
  • Incorrect control of engine systems (fan, fuel)
  • Emergency engine operation

Causes

  • Malfunction of the internal reference voltage regulator in the ECU
  • Shorting the reference voltage line to a wire with a higher potential
  • Damage to the insulation of the wiring harness near the power circuits
  • Incorrect installation or non-original sensor introducing voltage into the line
  • Corrosion or oxidation of connectors with parasitic power path

How to Fix

  1. Read error codes and record frozen frame data
  2. Measure the voltage on the 5V reference power line with the ignition on
  3. Disconnect all sensors of group D, check the voltage without load
  4. If the voltage remains high when the sensors are disconnected, check the ECU
  5. Inspect the wiring harness for contact with power wires.
  6. If necessary, replace the ECU or restore the wiring

Related codes

P06A3P06A4P06A9P0642P0652

Error P06A5 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P06A5 code mean?

P06A5 is an OBD-II diagnostic trouble code that indicates: Sensor Reference Voltage D Circuit High

What causes a P06A5 error code?

The most common causes of P06A5 include: Malfunction of the internal reference voltage regulator in the ECU; Shorting the reference voltage line to a wire with a higher potential; Damage to the insulation of the wiring harness near the power circuits; Incorrect installation or non-original sensor introducing voltage into the line.

How do I fix a P06A5 diagnostic trouble code?

To fix P06A5: Read error codes and record frozen frame data. Measure the voltage on the 5V reference power line with the ignition on. Disconnect all sensors of group D, check the voltage without load. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P06A5?

Do not drive — repair immediately

How much does it cost to fix P06A5?

The estimated repair cost for P06A5 is $22–444. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat