P0067 medium Severity

P0067: Air Assisted Injector Control Circuit High

May cause rough idle, poor cold-start performance, reduced fuel economy and increased emissions; usually does not cause immediate driveability failure at normal operating temperature.

Overview

P0067 indicates the powertrain control module has detected a high voltage condition in the air assisted injector control circuit, often related to wiring, connectors, air assist injector solenoid or ECM issues.

Common Symptoms

  • Check engine light illuminated
  • Hard to start when cold
  • Poor fuel economy
  • Rough idle or misfire at cold start
  • Reduced engine performance

Most Common Causes

Faulty air assisted injector or its solenoid medium

Injector internal failure or stuck valve can drive circuit high.

Wiring harness fault (short/open/high resistance) high

Damaged insulation, chafing, or short to power/ground can elevate voltage readings.

Corroded or poor electrical connector high

Moisture, corrosion or bent pins cause high resistance and abnormal signals.

Controller (PCM/ECM) driver circuit malfunction medium

Rare but possible; misreads high voltage when internal driver fails.

Vacuum leak affecting air assist system low

Indirect influence on injector performance d in forums.

Diagnostic Steps

  1. Connect professional OBD-II scanner and confirm P0067, note freeze frame data.
    Expected: Persistent P0067 code; no other conflicting codes.
    Interpretation: Confirms exact fault and conditions when set.
  2. Visually inspect wiring harness and connectors for damage, corrosion, or loose contacts.
    Expected: No broken wires, exposed insulation, or corroded pins.
    Interpretation: Wiring/connectors are common causes; if faults present, repair.
  3. Test circuit voltage at air assisted injector control wire with ignition on (engine off).
    Expected: Voltage within manufacturer spec (often ~5V signal range).
    Interpretation: Above expected values indicates high circuit condition.
  4. Disconnect injector and measure coil resistance with multimeter.
    Expected: Resistance within OEM spec.
    Interpretation: Out-of-range suggests injector failure.
  5. If wiring and injector test good, evaluate PCM output or consider reprogram/replace.
    Expected: Proper driver output or confirmed PCM malfunction.
    Interpretation: PCM faults are less common but documented.

Repair Solutions

Repair or replace damaged wiring and connectors medium
Estimated Cost: $50 - $300

Most common and cost-effective fix; includes cleaning connectors and dielectric grease.

Replace air assisted injector or solenoid medium
Estimated Cost: $150 - $500

Part cost varies by make/model; test before replacement.

PCM/ECM reprogramming or replacement hard
Estimated Cost: $300 - $1500

Only if driver circuit is confirmed faulty; requires VIN matching and programming.

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Assuming emission system MAP/MAF correlation issue (P0068) without verifying specific circuit voltage
  • Replacing air assist injector without checking wiring/connectors first

Frequently Asked Questions

Technical definition of P0067 OBD-II Code

The P0067 code stands for Air Assisted Injector Control Circuit High. This generally indicates an issue with the Fuel System system.

Should I stop driving if I have P0067?

You should treat P0067 as a medium issue. May cause rough idle, poor cold-start performance, reduced fuel economy and increased emissions; usually does not cause immediate driveability failure at normal operating temperature.

How do I know if I have code P0067?

You may experience the following: Check engine light illuminated, Hard to start when cold, Poor fuel economy.

Why is my car throwing a P0067 code?

This code is frequently triggered by: Faulty air assisted injector or its solenoid, Wiring harness fault (short/open/high resistance), Corroded or poor electrical connector.

Repair cost breakdown for P0067

Expect to pay around $300 if the issue is a Repair or replace damaged wiring and connectors, but up to $1500 if the PCM/ECM reprogramming or replacement needs replacement.

What cars are affected by the P0067 code?

P0067 is not specific to any one brand. It can appear on Ford, Dodge, Toyota, Honda, Jeep, and other vehicles.

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