OBD Guide
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P03D4

Cylinder 7 Pressure Sensor Circuit High

P03D4 is an OBD-II diagnostic trouble code meaning: Cylinder 7 Pressure Sensor Circuit High. Common causes: shorting the sensor signal wire to the power wire (12v or 5v), internal sensor failure with short circuit to power supply. Estimated repair cost: $22–133.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$22–133 (est.)

Symptoms

  • Check Engine light on
  • Inability to read cylinder 7 sensor data with scanner
  • Unstable engine operation in certain modes
  • Reduced efficiency of cylinder 7
  • Increased fuel consumption

Causes

  • Shorting the sensor signal wire to the power wire (12V or 5V)
  • Internal sensor failure with short circuit to power supply
  • Damage to the wiring insulation in the harness
  • Incorrectly connected connector during a previous repair
  • Moisture entering the connector with the formation of conductive channels

How to Fix

  1. Disconnect the cylinder 7 pressure sensor connector
  2. Measure the voltage at the signal contact of the harness connector - with normal wiring, about 5V
  3. If the voltage is >5V, check the harness for short circuit with the power wire
  4. If the voltage is ~5V, replace the pressure sensor
  5. Check the connector for moisture and traces of short circuit.
  6. Reassemble the circuit, reset codes and perform a diagnostic test

Related codes

P03D1P03D3P03DFP0307

Error P03D4 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P03D4 code mean?

P03D4 is an OBD-II diagnostic trouble code that indicates: Cylinder 7 Pressure Sensor Circuit High

What causes a P03D4 error code?

The most common causes of P03D4 include: Shorting the sensor signal wire to the power wire (12V or 5V); Internal sensor failure with short circuit to power supply; Damage to the wiring insulation in the harness; Incorrectly connected connector during a previous repair.

How do I fix a P03D4 diagnostic trouble code?

To fix P03D4: Disconnect the cylinder 7 pressure sensor connector. Measure the voltage at the signal contact of the harness connector - with normal wiring, about 5V. If the voltage is >5V, check the harness for short circuit with the power wire. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P03D4?

Do not drive — repair immediately

How much does it cost to fix P03D4?

The estimated repair cost for P03D4 is $22–133. Actual cost depends on your vehicle, location, and labor rates.

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