AutoFixDB - Free OBD-II diagnostic trouble code lookup. Find causes, symptoms, diagnostic steps and repair solutions.

Overview

OBD‑II DTC P03A2 indicates a high voltage/pressure reading from the Cylinder 2 Pressure Sensor Circuit, meaning the powertrain control module detects a circuit reading above expected limits for the pressure sensor in cylinder number 2.

Common Symptoms

Illuminated check engine light with P03A2 stored
Possible engine hesitation or rough idle
Reduced performance (depending on vehicle)
Possible increased emissions or drivability concerns

Most Common Causes

Faulty cylinder 2 pressure sensor medium

Sensor may be reporting a voltage that is too high relative to expected pressure characteristics.

Wiring issue (short to voltage on sensor circuit) medium

Corroded, damaged, or loose wiring/connectors can cause high circuit readings.

PCM/ECM fault low

Rare but possible; incorrect interpretation of sensor input due to module failure.

Diagnostic Steps

Verify P03A2 is the correct code and not a misread P0302 misfire code

Expected: Scan tool shows P03A2 without companion misfire codes; live data indicates high sensor voltage

Interpretation: Confirms focus should be on pressure sensor circuit rather than misfire.
Inspect wiring harness and connector for cylinder 2 pressure sensor

Expected: No damaged insulation, no corrosion, secure pins

Interpretation: Clean and repair as needed; if wiring is compromised, this may trigger high reading.
Test sensor voltage and resistance with multimeter

Expected: Sensor voltage within manufacturer specified range

Interpretation: Out‑of‑range readings indicate sensor replacement is necessary.
Replace sensor if confirmed faulty and clear code

Expected: Code does not return under normal operation

Interpretation: Repair successful if code stays cleared and drivability returns to normal.

Repair Solutions

Replace cylinder 2 pressure sensor medium

Estimated Cost: $150 - $400

Cost varies by vehicle; includes parts and labor. Sensor replacement often resolves the high circuit condition if wiring is intact.

Repair/replace wiring harness or connector medium

Estimated Cost: $50 - $200

Depends on extent of wiring damage and accessibility.

Replace PCM/ECM hard

Estimated Cost: $600 - $1500

Only if confirmed module fault; high cost and typically last resort.

Common Misdiagnoses

Avoid these common diagnostic mistakes:

P0302 cylinder 2 misfire (misinterpreting high pressure feedback as misfire)
Other misfire related codes (confusion with ignition/fuel issues without checking sensor circuit)

Frequently Asked Questions

Technical definition of P03A2 OBD-II Code

When your OBD-II scanner reads P03A2, it means: Cylinder 2 Pressure Sensor Circuit High. This code is related to the vehicle's Sensors.

How serious is the P03A2 code?

The P03A2 code is considered medium severity. May cause rough running or engine performance irregularities if pressure feedback is incorrect; depends on vehicle implementation.

Common signs of the P03A2 error code

The most typical signs are: Illuminated check engine light with P03A2 stored, Possible engine hesitation or rough idle, Reduced performance (depending on vehicle).

What causes the P03A2 code?

It can be caused by several factors, most notably: Faulty cylinder 2 pressure sensor, Wiring issue (short to voltage on sensor circuit), PCM/ECM fault.

What is the price difference for fixing P03A2?

Repair costs depend on the specific failure. A simple Repair/replace wiring harness or connector replacement is relatively affordable ($50-$200), whereas a Replace PCM/ECM repair is more expensive, potentially reaching $1500.

Does code P03A2 apply to Dodge vehicles?

Yes, P03A2 is a generic code that applies to all OBD-II compliant vehicles, including Ford, Toyota, Honda, Chevrolet, Nissan, Dodge, BMW, and more.

P03A2: Cylinder 2 Pressure Sensor Circuit High