OBD-II Code P0293 — What It Means & How to Fix It

What Does This Error Mean?

P0293 means the engine computer detected too high a voltage in the fuel injector circuit for cylinder 10. The ECM is seeing more voltage than it should when it tries to control the injector. This usually indicates a short to voltage in the wiring or a failed injector. Cylinder 10 may not be firing properly, causing rough running and power loss. This code only appears on V10 or V12 engines.

Affected Models

All vehicles 1996+ with 10+ cylinders
Common in Ford Excursion V10
Common in Dodge Viper V10
Common in BMW V12 models
Common in large diesel trucks

Common Causes

Fuel injector for cylinder 10 has an internal short, pulling too much voltage
Wiring harness short to battery voltage — a damaged wire touching a power source
Corroded injector connector creating abnormal resistance and voltage readings
Wrong fuel injector installed — incorrect resistance specification causing a high voltage condition
ECM injector driver circuit failure sending incorrect voltage to the injector

How to Fix It

Connect an OBD-II scanner and confirm P0293 along with any companion codes. A misfire code for cylinder 10 (P0310) confirms the injector problem is affecting engine performance and should be prioritized.

Record all codes before clearing them — the full picture helps with accurate diagnosis.
Locate the fuel injector for cylinder 10 and unplug its connector. Inspect the pins for corrosion, burns, or damage. Clean with electrical contact cleaner and make sure the connector locks securely when you reconnect it.

On a V10, cylinder 10 is typically at the rear of the bank. Consult your vehicle's service manual for exact cylinder numbering.
Test the injector's resistance with a multimeter set to ohms. Place the probes on both injector terminals. A healthy high-impedance injector reads 10-17 ohms. A reading near zero ohms indicates an internal short — replace the injector.

Low-impedance injectors (common on older performance engines) read 2-5 ohms — check your service manual for your specific specification.
Inspect the wiring harness from the injector connector back toward the ECM. Look for areas where the harness may contact hot or sharp metal, causing the insulation to wear through and short to a power wire. Repair any damage with proper wire connectors and heat shrink.

Pay close attention to the area near the exhaust manifold — heat can degrade wiring insulation over years.
If the injector and wiring check out, have a mechanic verify ECM output for the cylinder 10 driver circuit using a scope or advanced scan tool. ECM driver failures are rare but possible and will require ECM replacement or repair.

Some specialty shops can repair individual ECM driver circuits at lower cost than full ECM replacement.

When to Call a Professional

P0293 often requires a wiring diagram and multimeter to trace properly. If the injector connector and visible wiring look fine, take the vehicle to a mechanic with OEM-level diagnostic tools. Don't guess on an ECM replacement — always confirm the injector and wiring are good first. Diagnosis costs $100-$200, and injector replacement runs $150-$400 with labor.

Frequently Asked Questions

Which vehicles have a cylinder 10?

Only V10 and V12 engines have a cylinder 10. V10 examples include the Ford Excursion and Super Duty with the 6.8L V10, the Dodge Viper, and some European models. V12 engines appear in BMW 7-series, Audi A8, Ferrari, and Lamborghini models. If your vehicle has fewer than 10 cylinders, double-check the code — it may be a scanner error.

Can P0293 damage my engine?

Yes, if left unaddressed. If cylinder 10 isn't firing due to injector circuit problems, unburned fuel or a misfiring cylinder stresses the catalytic converter. Prolonged driving with P0293 active can lead to catalytic converter damage, which is expensive to repair. Address this code promptly.

Is P0293 the same as P0261 or P0264?

They are the same type of code but for different cylinders. P0261 covers cylinder 1 injector circuit low, P0264 covers cylinder 2 — the numbering pattern continues through all cylinders. P0293 specifically means cylinder 10's injector circuit voltage is high. The diagnosis and repair steps are the same regardless of which cylinder is affected.