Powertrain, generic (extended)

P2697 Exhaust Aftertreatment Fuel Injector A Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

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

Symptoms

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

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–1,500
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

hc dosing injectorinjector solenoidwiring harness

Related codes

P2698P2699P269AP24F6P24F7

References: static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.