What Does P2309 Mean?
The PCM has detected an abnormally low voltage condition in the primary control circuit for ignition coil D. This suggests a short to ground in the control circuit wiring or an internal fault in the coil or PCM.
Common Causes
35%
Short to ground in primary control wire between PCM and coil D
30%
Failed ignition coil D with internal short in primary winding
20%
Chafed or pinched wiring harness causing intermittent short to ground
15%
Failed PCM ignition coil driver circuit with internal short
Diagnostic Steps
1
Step 1: Disconnect ignition coil D connector and verify control circuit voltage/signal from PCM
2
Step 2: Test control wire from PCM to coil D for short to ground with coil disconnected
3
Step 3: Measure primary winding resistance in ignition coil D and verify within specifications
4
Step 4: Inspect entire wiring harness for damage, rubbing, or pinch points that could cause short
5
Step 5: If wiring and coil test good, suspect PCM driver circuit failure and consider PCM replacement
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The PCM has detected an abnormally low voltage condition in the primary control circuit for ignition coil D. This suggests a short to ground in the control circuit wiring or an internal fault in the coil or PCM.
The most common cause of P2309 (Ignition Coil "D" Primary Control Circuit Low) is: Short to ground in primary control wire between PCM and coil D
Typical repair costs for P2309 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Cylinder D misfire will cause rough engine operation and potential stalling. Extended driving with misfire will damage catalytic converter and increase emissions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2309 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition System
Difficulty
Type
Generic (SAE)
Recommended Tools
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