P2690: Cylinder 5 Injector Data Incompatible

P2690 is the first code of the series that a four-cylinder engine cannot set; it needs at least five cylinders. It reports that the flow correction for the cylinder 5 injector is absent or rejected by the controller. GM uses it in its 2025 six-cylinder diesel table 25OBDG04B as well as in its V8 diesel tables, Type A, with the value stored under DID $64. Ford's 2023 diesel summary, which spans the 3.0 L V6 and 6.7 L V8, includes it too. On V engines the location of cylinder 5 varies: Ford counts one bank first, GM alternates sides, so the service data must be checked before touching an injector. Expect a lit MIL rather than drivability trouble.

Cylinder 5 is numbered according to the manufacturer: check your engine's manual before working on it.

Symptoms

• Check engine light on
• Rarely uneven running

Most likely causes

• Cylinder 5 injector replaced without entering its code
• Code entered for the wrong cylinder because of the bank numbering
• Injector code programming interrupted

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the connector and wiring of the injector indicated
2. Measure the resistance and compare it with the manufacturer's specification
3. Check the control signal with an oscilloscope; on direct injection or diesel engines, leave this to a repair shop because of the high voltages
4. On diesels, check the per-cylinder injection corrections

Good to know

• Repair difficulty: medium
• It affects emissions.

What each character of P2690 means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• 6: Control modules and outputs
• 90: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2690?

Drive as little as possible and go to a repair shop. If you smell fuel or the engine is shaking badly, do not keep driving.

What causes code P2690?

The most common causes are: cylinder 5 injector replaced without entering its code; code entered for the wrong cylinder because of the bank numbering; injector code programming interrupted.

Related codes

• P268FCylinder 4 Injector Data Incompatible
• P2691Cylinder 6 Injector Data Incompatible
• P2696Injector Data Incompatible
• P0205Cylinder 5 Injector A Circuit/Open
• P02F2Cylinder 5 Injector Circuit Range/Performance

Sources

• law.cornell.edu: 13 CCR 1968.2
• gsi.ext.gm.com: 25OBDG04B
• fordservicecontent.com: obd summary diesel 2023

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.