P1263 serious

Cylinder 3 Injector Driver Circuit — High-to-Low Side Short (Ford / Chrysler Diesel)

The P1263 code means the vehicle's onboard diagnostic system has detected: Cylinder 3 Injector Driver Circuit — High-to-Low Side Short (Ford / Chrysler Diesel). This is a serious severity code.

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Keep driving?
Short distances only
DIY difficulty
professional
Estimated cost
$300-$1,500+ depending on the root cause — a harness/connector repair, a FICM (~$300-600, often requires programming), or an injector. Diagnose before buying: a new injector will not fix a wiring short or a bad FICM.

Manufacturer-specific code. P1263 is a manufacturer-specific DTC, so its exact definition can differ by make, model, and year. Use the meaning above as a general guide, and always confirm it against your vehicle manufacturer's official service information (or a make-specific scan tool) before diagnosing or replacing parts.

What Are the Symptoms of P1263?

  • Check Engine Light on
  • Misfire, rough running, or stumble on cylinder 3
  • Reduced power / limp mode
  • Hard starting or, in some cases, a no-start
  • Possible black/white smoke on diesels

What Causes P1263? (Most Likely First)

  • Short between the high-side and low-side injector driver circuits for cylinder 3 (chafed wiring harness) High
  • Failing FICM/IDM injector driver module — common on 6.0L Power Stroke; the shared low-side driver means one short can flag several cylinders High
  • Corroded or loose injector connector (often under the valve cover) Moderate
  • Failed cylinder-3 injector solenoid (high-pressure HEUI/diesel injector — not a casual swap) Moderate

Can I Still Drive with P1263?

Short distances only. P1263 is rated serious severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.

Frequently Asked Questions

Does P1263 mean my cylinder 3 injector is bad?

Not necessarily. P1263 is an injector-driver CIRCUIT short — most often the wiring harness, an under-valve-cover connector, or the FICM/IDM module, rather than the injector itself. Diagnose the circuit before buying an expensive diesel injector.

Is this a gas or diesel code?

Almost always diesel — primarily Ford Power Stroke (7.3L/6.0L) and Chrysler/Jeep CRD. Confirm your engine, since manufacturer-specific P1xxx codes vary.

Can I drive with P1263?

Expect reduced power or limp mode. Drive only as far as needed to get it diagnosed — diesel injector and FICM faults can worsen and leave you stranded.

Mechanics Guide Step-by-step diagnosis

How Do You Diagnose P1263?

  1. Confirm make/engine — P1263 is mainly a Ford (7.3L/6.0L Power Stroke) and Chrysler/Jeep CRD diesel injector-driver code; the exact meaning varies by manufacturer.

  2. Scan FICM/IDM live data and note whether multiple cylinder driver codes are present — on the 6.0L the shared low-side driver can implicate the wrong cylinder.

  3. Inspect the injector harness and under-valve-cover connectors for chafing and corrosion BEFORE condemning any injector.

  4. Test the FICM output; a weak or failing FICM is a frequent root cause and is not the injector.

  5. Only after the circuit and FICM check out should the cylinder-3 injector itself be suspected.

Which Vehicles Commonly Get P1263?

  • 1999-2003 Ford 7.3L Power Stroke (F-250/F-350/Excursion)
  • 2003-2007 Ford 6.0L Power Stroke
  • 2005-2006 Jeep Liberty CRD 2.8L
  • European Ford Focus/Transit/Mondeo TDCi diesel

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