OBD Guide
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P122A

Fuel Injector 3 Control Circuit Shorted

P122A is an OBD-II diagnostic trouble code meaning: Fuel Injector 3 Control Circuit Shorted. Common causes: damage to the injector wiring harness, fuel injector malfunction. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Unstable engine operation
  • Power Loss
  • Increased fuel consumption
  • Misfire in cylinder 3
  • Check Engine Light Is On

Causes

  • Damage to the injector wiring harness
  • Fuel injector malfunction
  • Short circuit in control circuit
  • Problems with the engine control unit
  • Contact corrosion

How to Fix

  1. Check the integrity of the injector wiring harness
  2. Measure the injector resistance
  3. Check control circuit voltage
  4. Replace fuel injector if necessary
  5. Repair damaged wiring

Related codes

P122BP1229P1230

FAQ

What does the P122A code mean?

P122A is an OBD-II diagnostic trouble code that indicates: Fuel Injector 3 Control Circuit Shorted

What causes a P122A error code?

The most common causes of P122A include: Damage to the injector wiring harness; Fuel injector malfunction; Short circuit in control circuit; Problems with the engine control unit.

How do I fix a P122A diagnostic trouble code?

To fix P122A: Check the integrity of the injector wiring harness. Measure the injector resistance. Check control circuit voltage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P122A?

Limited driving only, diagnose soon

How much does it cost to fix P122A?

The estimated repair cost for P122A is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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