OBD Guide
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P1263

Cylinder #3 High To Low Side Short

P1263 is an OBD-II diagnostic trouble code meaning: Cylinder #3 High To Low Side Short. Common causes: damage to the injector wiring harness, cylinder 3 injector malfunction. Estimated repair cost: $17–89.

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

Symptoms

  • Misfire in cylinder 3
  • Unstable engine operation
  • Power reduction
  • Increased fuel consumption
  • Check Engine Light Illuminates

Causes

  • Damage to the injector wiring harness
  • Cylinder 3 injector malfunction
  • Problems in the engine control unit
  • Short circuit in control circuit
  • Contact corrosion

How to Fix

  1. Check the integrity of the injector wiring harness
  2. Test the resistance of the cylinder 3 injector
  3. Check the voltage at the injector
  4. Inspect connectors and contacts for corrosion
  5. If necessary, replace the injector or wiring harness

Related codes

P0203P0263P1264

Error P1263 by Vehicle Brand

FordLincolnMercury

FAQ

What does the P1263 code mean?

P1263 is an OBD-II diagnostic trouble code that indicates: Cylinder #3 High To Low Side Short

What causes a P1263 error code?

The most common causes of P1263 include: Damage to the injector wiring harness; Cylinder 3 injector malfunction; Problems in the engine control unit; Short circuit in control circuit.

How do I fix a P1263 diagnostic trouble code?

To fix P1263: Check the integrity of the injector wiring harness. Test the resistance of the cylinder 3 injector. Check the voltage at the injector. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1263?

Limited driving only, diagnose soon

How much does it cost to fix P1263?

The estimated repair cost for P1263 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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