What does P02AC mean?

Cylinder 5 Injector Restricted Possible rough idle, misfire, reduced power and fuel economy

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

Overview

P02AC OBD-II trouble code indicating restricted fuel injector flow at cylinder 5 leading to lean condition and drivability issues

Common Symptoms

Check Engine Light (MIL) illuminated
Rough engine idle or misfire
Reduced engine performance
Decreased fuel economy
Possible exhaust odor or increased emissions

Most Common Causes

Clogged or restricted fuel injector at cylinder 5 high

Debris, carbon buildup or contamination causing reduced fuel flow

Wiring or connector issue to cylinder 5 injector medium

Corrosion, loose connection, open or shorted circuit can mimic restriction

Faulty fuel injector (mechanical failure) medium

Internal failure of injector components reducing flow

Fuel quality or contamination issue low

Poor fuel quality can contribute but not isolate single injector usually

PCM/ECM fault or programming anomaly low

Rare but possible false detection

Diagnostic Steps

Connect OBD-II scanner and verify P02AC and related fuel trim/misfire codes

Expected: P02AC present with possible misfire or lean trim codes

Interpretation: Confirm code validity and gather context
Inspect wiring and connector at cylinder 5 injector

Expected: No damaged wires, secure connector

Interpretation: Rule out electrical issues that mimic injector restriction
Perform injector balance or pulse test with scan tool or stethoscope

Expected: Injector clicks similar to other cylinders

Interpretation: No sound suggests injector fault or restriction
Swap injector 5 with another cylinder and re-scan

Expected: If code follows injector, injector likely cause

Interpretation: Helps isolate injector versus wiring/circuit issue
Check fuel pressure and fuel system components

Expected: Fuel pressure within spec and no contamination

Interpretation: Ensures overall fuel delivery not contributing

Repair Solutions

Clean fuel injector for cylinder 5 medium

Estimated Cost: $50 - $200

Ultrasonic or professional cleaning can restore flow if lightly clogged

Replace fuel injector for cylinder 5 medium

Estimated Cost: $150 - $500

OEM injector ensures best performance; labor increases cost on some engines

Repair wiring or connector issues easy

Estimated Cost: $20 - $150

Fix corrosion, broken wires, or poor connections

Fuel system cleaning and filter replacement easy

Estimated Cost: $30 - $120

Helps address contamination that may contribute to injector restriction

Common Misdiagnoses

Avoid these common diagnostic mistakes:

Assuming general misfire without isolating injector restriction
Replacing PCM/ECM before checking wiring or injector functionality

Frequently Asked Questions

Can you explain the meaning of P02AC?

The P02AC code stands for Cylinder 5 Injector Restricted. This generally indicates an issue with the Fuel System system.

How serious is the P02AC code?

The P02AC code is considered medium severity. Possible rough idle, misfire, reduced power and fuel economy

Common signs of the P02AC error code

Drivers often report: Check Engine Light (MIL) illuminated, Rough engine idle or misfire, Reduced engine performance when this code is present.

Potential causes for OBDII code P02AC

Potential culprits include: Clogged or restricted fuel injector at cylinder 5, Wiring or connector issue to cylinder 5 injector, Faulty fuel injector (mechanical failure). A proper diagnosis is recommended.

How much does it cost to fix P02AC?

It depends on what needs to be fixed. Fuel system cleaning and filter replacement repairs are cheaper (~$120), while Replace fuel injector for cylinder 5 repairs are on the higher end (~$500).

Is the P02AC code specific to Chevrolet?

P02AC is not specific to any one brand. It can appear on Ford, Dodge, Toyota, Honda, Jeep, and other vehicles.

P02AC: Cylinder 5 Injector Restricted