What Does P2699 Mean?
The PCM has detected abnormally low voltage or current in the circuit controlling the exhaust aftertreatment fuel injector. This indicates an electrical fault preventing proper injector operation for regeneration cycles.
Common Causes
35%
Short to ground in aftertreatment injector wiring
30%
Failed aftertreatment fuel injector with internal short
20%
Damaged or corroded injector connector
10%
PCM driver circuit failure
5%
Broken or chafed wiring harness
Diagnostic Steps
1
Step 1: Disconnect aftertreatment injector connector and measure resistance of injector coil; compare to specifications
2
Step 2: Inspect injector connector and terminals for corrosion, damage, or moisture intrusion
3
Step 3: Check for continuity between injector control wire and ground with injector disconnected
4
Step 4: Measure voltage at injector connector with key on; verify PCM is providing proper supply voltage
5
Step 5: Trace wiring harness for shorts, damage, or routing near hot/sharp components
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
The PCM has detected abnormally low voltage or current in the circuit controlling the exhaust aftertreatment fuel injector. This indicates an electrical fault preventing proper injector operation for regeneration cycles.
The most common cause of P2699 (Exhaust Aftertreatment Fuel Injector "A" Circuit Low) is: Short to ground in aftertreatment injector wiring
Typical repair costs for P2699 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but DPF regeneration will not function properly, potentially causing filter clogging and engine performance issues over time.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2699 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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