OBD Guide
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P124B

Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit

P124B is an OBD-II diagnostic trouble code meaning: Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit. Common causes: damage to the injector wiring harness, injector 4 fault. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Unstable engine operation
  • Misfires
  • Increased fuel consumption
  • Reduced engine power
  • Check Engine Light Is On

Causes

  • Damage to the injector wiring harness
  • Injector 4 fault
  • Problems in the engine control unit (ECU)
  • Short circuit in control circuit
  • Corrosion or oxidation of contacts

How to Fix

  1. Check the injector wiring harness for damage.
  2. Check the resistance and operation of injector 4
  3. Inspect contacts and connectors for corrosion
  4. Check control circuit for short circuit
  5. If necessary, replace the injector or wiring harness

Related codes

P124AP124CP124D

FAQ

What does the P124B code mean?

P124B is an OBD-II diagnostic trouble code that indicates: Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit

What causes a P124B error code?

The most common causes of P124B include: Damage to the injector wiring harness; Injector 4 fault; Problems in the engine control unit (ECU); Short circuit in control circuit.

How do I fix a P124B diagnostic trouble code?

To fix P124B: Check the injector wiring harness for damage.. Check the resistance and operation of injector 4. Inspect contacts and connectors for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P124B?

Yes, but get it checked soon

How much does it cost to fix P124B?

The estimated repair cost for P124B is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat