OBD-II Code P0288 — What It Means & How to Fix It

What Does This Error Mean?

P0288 means the fuel injector circuit for Cylinder 10 is reading a low voltage or current signal. The ECM fires each injector and checks the electrical circuit response. A below-normal signal on Cylinder 10's circuit triggers P0288. This code only appears on vehicles with 10 or more cylinders — primarily V10 trucks and sports cars. Causes include a bad connector, broken wire, failed injector, or ECM driver fault. Symptoms include rough idle, misfires, and reduced performance.

Affected Models

All vehicles 1996+ with 10 or more cylinders
Common in Ford F-250/F-350 with the 6.8L V10 Triton
Common in Dodge Viper V10 engines
Common in V12 vehicles as Cylinder 10 also exists in those engines

Common Causes

Corroded or loose connector at the Cylinder 10 fuel injector
Broken, chafed, or damaged wire between the ECM and the Cylinder 10 injector
Open-circuit failure inside the Cylinder 10 injector's solenoid coil
ECM driver circuit failure for Cylinder 10
Blown fuse or failed relay in the injector supply circuit that covers Cylinder 10

How to Fix It

Locate the Cylinder 10 injector — on a V10 it's typically the rearmost injector on one bank. Unplug the connector and inspect both sides for corrosion, bent pins, moisture, and a firm, locked connection. Clean with contact cleaner and reseat firmly.

The Cylinder 10 injector is often among the most inaccessible on the engine. If the connector hasn't been touched in years, corrosion is a real possibility.
Inspect the wiring harness for Cylinder 10 from the connector toward the ECM. These harness runs on V10 engines can be quite long — check the entire path for heat damage, chafing against brackets, and any section that passes through the firewall.

On the Ford 6.8L V10, wiring harness issues affecting the rear cylinders are documented in technical service bulletins — check if there's a TSB for your specific model year.
Test the Cylinder 10 injector resistance. With the connector unplugged, probe both injector terminals with a multimeter set to ohms. A normal reading is 10–18 ohms. An open or infinite reading means the injector's solenoid coil has failed internally. Replace the injector.

An open injector delivers zero fuel to Cylinder 10 — the engine will have a hard misfire on that cylinder.
Check the injector supply fuses and relays for the circuit that covers Cylinder 10. On V10 engines the injectors may be split across two fuse circuits. Multiple simultaneous injector codes (e.g., P0285, P0288) point to a shared power circuit fault rather than individual injector failures.

Locate the injector fuse assignments in a service manual — the owner's manual may not list all injector fuses by circuit.
If all components test within spec, have a professional verify the ECM's Cylinder 10 driver output using a lab scope. ECM driver failures do occur on high-cylinder-count engines and are more likely on high-mileage units with a history of electrical issues.

Before buying a new ECM, ask about remanufactured or reprogrammed units — these are often significantly cheaper and just as reliable.

When to Call a Professional

V10 engines have longer and more complex wiring harnesses than V6 or V8 engines. If basic connector and wiring inspection doesn't reveal the cause of P0288, have a shop with V10 experience perform a proper circuit test. Also confirm with your shop what a full injector circuit diagnosis costs before authorizing work — pricing varies widely on large-displacement engines.

Frequently Asked Questions

Which vehicles have a Cylinder 10?

Cylinder 10 exists on V10 and V12 engines. Common examples include the Ford F-250/F-350 with the 6.8L V10, the Dodge Viper 8.0L and 8.4L V10, and various V12-equipped luxury cars from BMW, Mercedes-Benz, Audi, and Rolls-Royce.

What if multiple high-cylinder injector codes appear at the same time?

Multiple simultaneous injector circuit codes on high-cylinder engines often indicate a shared circuit fault. Check the injector supply fuse and relay for the affected cylinder bank first. Also inspect the wiring harness connector that feeds the rear bank — a single loose connector here can trigger multiple codes at once.

How much does it cost to fix P0288?

Connector cleaning or repair: Free to $50. Wiring harness repair: $150–$400. Injector replacement: $200–$600 installed. ECM repair or replacement: $400–$1,500+.