P2698: Exhaust Aftertreatment Fuel Injector A Performance

P2698 is not about wiring but about whether the exhaust fuel doser does what it is told; most often the check looks for leakage when no dosing is requested. Ford's 3.2 L Transit (2017 and 2018 summaries) compares a measured temperature downstream of the injection point with a model after at least 6 h engine-off. The 2023 6.7 L Super Duty uses a model check after 21,600 s soak plus a second logic that balances oxygen mass before and after the catalyst. Volvo and Mack article KC-90 (model years 2016–17) warns the code can appear without symptoms and points to exhaust sensors, a low-flow nozzle, the AHI module and the catalyst; Mack bulletin GDC19-014 (US19) first updates engine software. Ram also lists P2698 in a 2026 PCM flash for 6.7 L Cummins chassis cabs.

Symptoms

• MIL on, often without noticeable drivability change
• Regenerations fail or take unusually long
• Higher fuel use or white exhaust smoke

Most likely causes

• Doser valve or nozzle leaking fuel into the exhaust
• Coked nozzle or line causing low flow
• Exhaust temperature sensor drifting and skewing the model comparison
• Engine software needing the manufacturer update

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. Compare the reading with other engine data while varying the engine speed.
3. Measure the resistance and compare it with the manufacturer's specification
4. Check the control signal with an oscilloscope; on direct injection or diesel engines, leave this to a repair shop because of the high voltages
5. On diesels, check the per-cylinder injection corrections

Good to know

• Repair difficulty: hard
• It can trigger limp mode.
• It affects emissions.

What each character of P2698 means

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

Frequently asked questions

Can I keep driving with code P2698?

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 P2698?

The most common causes are: doser valve or nozzle leaking fuel into the exhaust; coked nozzle or line causing low flow; exhaust temperature sensor drifting and skewing the model comparison.

Related codes

• P2697Exhaust Aftertreatment Fuel Injector A Circuit/Open
• P2699Exhaust Aftertreatment Fuel Injector A Circuit Low
• P269AExhaust Aftertreatment Fuel Injector A Circuit High
• P24A0Closed Loop Particulate Filter Regeneration Control At Limit - Temperature Too Low
• P24F6Exhaust Aftertreatment Fuel Air Purge Valve Stuck Open

Sources

• fordservicecontent.com: DOBDSM1701
• fordservicecontent.com: obd summary diesel 2023
• static.nhtsa.gov: MC 10209689 0001
• static.nhtsa.gov: MC 10173132 0001

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.