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.

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Common Symptoms

  • 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

Probable Causes (Ranked by Likelihood)

  • 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

Step-by-Step Diagnostic Procedure

  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.

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.

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