P2697: Exhaust Aftertreatment Fuel Injector A Circuit/Open

Many heavy diesels do not raise exhaust temperature for filter regeneration by late in-cylinder injection, but spray diesel straight into the exhaust ahead of the oxidation catalyst through a separate doser, often called the seventh injector. P2697 means the solenoid that meters this fuel cannot be driven because its circuit is open. Volvo and Mack document it in their aftertreatment hydrocarbon injector (AHI) guide for US10 engines with 2013 OBD and later, as P2697 with failure type 13: the electric valve sits in the AHI dosing module, which moved onto the fuel filter housing from model year 2017, while the nozzle in the exhaust is purely hydraulic. The guide sends technicians to the module connector and harness. No dosing means no active regeneration, and soot builds up in the filter.

Medium severity. Can I keep driving?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.

Symptoms

Active particulate filter regeneration not possible
Rising soot load, later derate
MIL on

Most likely causes

Loose, corroded or damaged connector at the dosing module
Harness to the dosing valve broken by heat or vibration
Dosing valve coil inside the module burnt open

What to check, in order

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

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

Good to know

Repair difficulty: medium
It can trigger limp mode.
It affects emissions.

What each character of P2697 means

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

Frequently asked questions

Can I keep driving with code P2697?

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 P2697?

The most common causes are: loose, corroded or damaged connector at the dosing module; harness to the dosing valve broken by heat or vibration; dosing valve coil inside the module burnt open.

Related codes

Sources

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.