OBD Guide
ENFRDEESPT

P06D4

Sensor Reference Voltage E Circuit High

P06D4 is an OBD-II diagnostic trouble code meaning: Sensor Reference Voltage E Circuit High. Common causes: internal fault of the ecu reference voltage source, circuit e wire shorted to high voltage source. Estimated repair cost: $17–889.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$17–889 (est.)

Symptoms

  • False sensor error codes with "Circuit High" reading
  • Incorrect engine operation - over-rich or over-lean mixture
  • Check Engine Light Is On
  • Unstable idle speed
  • Possible transition to emergency mode

Causes

  • Internal fault of the ECU reference voltage source
  • Circuit E wire shorted to high voltage source
  • Damage to wiring insulation
  • Malfunction in the ECU ground circuit
  • Overvoltage in the vehicle's on-board network

How to Fix

  1. Measure the actual voltage of circuit E with the ignition on
  2. Check if the reading matches the norm of 5 V
  3. Examine the wiring diagram to identify sources that may be causing increased voltage on circuit E
  4. Check the insulation of the reference voltage wire along its entire length
  5. Check the quality of the ECU grounding
  6. If the wiring is correct, send the ECU for diagnostics.

Related codes

P06D2P06D3P06D5P0642P0652

Error P06D4 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P06D4 code mean?

P06D4 is an OBD-II diagnostic trouble code that indicates: Sensor Reference Voltage E Circuit High

What causes a P06D4 error code?

The most common causes of P06D4 include: Internal fault of the ECU reference voltage source; Circuit E wire shorted to high voltage source; Damage to wiring insulation; Malfunction in the ECU ground circuit.

How do I fix a P06D4 diagnostic trouble code?

To fix P06D4: Measure the actual voltage of circuit E with the ignition on. Check if the reading matches the norm of 5 V. Examine the wiring diagram to identify sources that may be causing increased voltage on circuit E. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P06D4?

Do not drive — repair immediately

How much does it cost to fix P06D4?

The estimated repair cost for P06D4 is $17–889. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat